Missouri River flooding

Losses, 2024 dollars

$2.9 billion

Losses at the time

$2.0 billion

Deaths

5

The losses and deaths are NCEI’s, counting everything the disaster did. The episodes below are only what the Weather Service filed in its Storm Events record, which counts damage differently and often not at all, so the two never add up and are shown apart.

• Flooding in Arkansas, April 29 to 30, 2011$240,000 · 4 eventsVery heavy rainfall across northern and central Arkansas caused the White River to rise above flood stage late in the month. While the flooding was minor in the month of April, flooding persisted into the month of May where historic river levels were seen.
• Flash Flooding and Flood in Arkansas, April 30, 2011$47,000 · 1 in hail · 5 eventsA cold front pushed into Arkansas on the 30th and then became nearly stationary. Although there was isolated severe weather, the more significant event was heavy rain and flash flooding.
• Debris Flow in California, April 30, 2011$250,000 · 1 eventStorms from March provided the necessary moisture to cause a hillside to fail producing a debris flow weeks later.
• Lakeshore Flood in Vermont, May 1 to 31, 2011$9.8 million · 5 eventsRecord Flooding occurred along the shores of Lake Champlain from mid-April to mid-June.
• Lakeshore Flood in New York, May 1 to 31, 2011$5.0 million · 2 eventsRecord Flooding occurred along the shores of Lake Champlain from mid-April to mid-June.
• Flooding in Indiana, May 1 to 30, 2011$2.5 million · 10 eventsHeavy rainfall in March set the stage for major flooding when near-record rains fell in April and May. At Evansville, April was the second wettest April on record with 11.77 inches.
• Flash Flood and Flooding in Indiana, May 1 to 10, 2011$260,000 · 7 eventsWidespread flooding continued from April into May across southwest Indiana. Following excessive rain in April, a final dose of heavy rain came between April 30 and May 2.
• Flooding in New York, May 1 to 9, 20116 eventsIn April, the combination of several rounds of heavy rainfall from convection, rapid snowmelt due to the warm temperatures and above normal soil moisture led to increased runoff and rapid river rises.
• Flooding in Kentucky, May 1 to 10, 20115 eventsMany area rivers, including the main stem of the Ohio, went into flood in April and remained in flood through early May. Some additional heavy rains on May 2 and 3 slowed the fall or even delayed the crest on some of the streams.
• Flooding in Arkansas, May 1 to 31, 20114 deaths · $6.6 million · 14 eventsHeavy rains continued to occur across the Mid-Mississippi Valley into the Ohio Valley during the beginning part of May. In addition, spring snow melt across the Dakotas and Minnesota continued to create higher than normal river levels on the Mississippi River.
• Flooding in Arkansas, May 1 to 31, 20112 deaths · $250 million · 45 eventsAreal flooding was widespread in Arkansas, beginning early in May. The flooding was caused by large amounts of rain on April 30th, and May 1st and 2nd; high water flowing down from Missouri; and backwater flooding from rivers and large creeks and bayous.
• Flooding in Tennessee, May 1 to 31, 2011$2.0 billion · 5 eventsHeavy rains continued to occur across the Mid-Mississippi Valley into the Ohio Valley during the beginning part of May. In addition, spring snow melt across the Dakotas and Minnesota continued to create higher than normal river levels on the Mississippi River.
• Flooding in Mississippi, May 1 to 31, 2011$1.0 billion · 3 eventsHeavy rains continued to occur across the Mid-Mississippi Valley into the Ohio Valley during the beginning part of May. In addition, spring snow melt across the Dakotas and Minnesota continued to create higher than normal river levels on the Mississippi River.
• Flash Flooding and Flooding in Missouri, May 1 to 31, 2011$295 million · 13 eventsHeavy rainfall in March set the stage for major flooding when record-setting rains fell in April and May. At Cape Girardeau, 31.85 inches of rain fell between March and May.
• Flooding in North Dakota, May 1 to 31, 2011$110 million · 4 eventsThis was part of historic flooding in North Dakota with statewide costs estimated around 1.5 billion dollars. Flooding was the result of significant winter snows and significant spring rains, not only in North Dakota but in Saskatchewan, Canada, as well.
• Flooding in Kentucky, May 1 to 31, 2011$32 million · 13 eventsHeavy rainfall in March set the stage for major flooding when record-setting rains fell in April and May. At Paducah, 15.91 inches of rain fell in April, which was 10.96 inches above normal.
• Flash Flood and Flooding in Kentucky, May 1 to 10, 2011$9.3 million · 23 eventsWidespread flooding continued from April into May across western Kentucky. Following excessive rain in April, a final dose of heavy rain came between April 30 and May 2.
• Flash Flood and Flooding in Illinois, May 1 to 31, 20111 injured · $7.3 million · 16 eventsHeavy rainfall in March set the stage for major flooding when record-setting rains fell in April and May. At Paducah, 15.91 inches of rain fell in April, which was 10.96 inches above normal.
• Flash Flood and Flooding in Missouri, May 1 to 10, 2011$7.9 million · 12 eventsWidespread flooding continued from April into May across southeast Missouri. Following excessive rain in April, a final dose of heavy rain came between April 30 and May 2. Numerous rounds of showers and thunderstorms produced additional average rainfall amounts of 4 to 6 inches.
• Flooding in Arkansas, May 1 to 31, 2011$2.3 million · 21 eventsWidespread heavy rainfall during late April and into the first part of May caused many rivers across the state to rise above flood stage. Many of the rivers rose above flood stage in late April, and the flooding persisted through much of May.
• Flooding in Illinois, May 1 to 10, 2011$1.5 million · 19 eventsWidespread flooding continued from April into May across southern Illinois. Following excessive rain in April, a final dose of heavy rain came between April 30 and May 2. Numerous rounds of showers and thunderstorms produced additional average rainfall amounts of 4 to 6 inches.
• Flooding in Missouri, May 1 to 31, 2011$750,000 · 2 eventsHeavy rains continued to occur across the Mid-Mississippi Valley into the Ohio Valley during the beginning part of May. In addition, spring snow melt across the Dakotas and Minnesota continued to create higher than normal river levels on the Mississippi River.
• Flood in Mississippi, May 1 to 31, 2011$250,000 · 1 eventSnow melt in the central and northern United States and heavy springtime rainfall in the Ohio Valley and Tennessee Valleys contributed to significant flooding along the lower Mississippi River. The magnitude of flooding was comparable to the floods of 1927, 1983, and 1993.
• Flooding in Nebraska, May 1 to 31, 2011$30,000 · 4 eventsSeveral episodes of heavy rain in eastern Nebraska and southwest Iowa combined with high flows upstream from snow melt and rain brought a prolonged period of flooding along the Missouri River, initially generally downstream of Plattsmouth, but by the end of the month it affected…
• Flooding in South Dakota, May 1 to 31, 20116 eventsModerate to major flooding on the James River continued through the month, with the river very slowly subsiding and no new flooding reported. Highest stages during the month were all on May 1st. Farmland and some roads near the river remained flooded.
• Heavy Rain in Arkansas, May 1 to 31, 20115 eventsSeveral reporting stations reported record rainfalls for the month of May.
• Flooding in South Dakota, May 1 to 31, 20114 eventsPrevious snowmelt and above normal May rainfall resulted in continued flooding on several rivers and creeks across northeast South Dakota throughout May.
• Flooding in Idaho, May 1 to 31, 2011$3,000 · 5 eventsExtensive snowfall melt combined with rain in May caused minor flooding in several counties.
• Flash Flooding and Hail in Oklahoma, May 1, 20111 in hail · 8 eventsA slow moving cold front moved through eastern Oklahoma on May 1st with widespread showers and thunderstorms occurring along and behind the front.
• Flash Flooding and Hail in Tennessee, May 1 to 2, 20111.75 in hail · 8 eventsA slow moving cold front moved into the Mid-South during the May 1st-May 3rd, 2011 time frame. Showers and thunderstorms developed along the front and trained across the same area. As a result, flash flooding occurred in areas mainly north of Interstate 40 in West Tennessee.
• Flash Flooding and Damaging Wind in Arkansas, May 1 to 2, 201150 kt wind · 4 eventsA slow moving cold front moved into the Mid-South during the May 1st-May 3rd, 2011 time frame. Showers and thunderstorms developed along the front and trained across the same area.
• Flash Flooding in Missouri, May 1 to 2, 20117 eventsA stubborn upper level trough over the central and southern Plains region along with a stalled out stationary front over the lower Mississippi Valley produced several rounds of moderate to heavy rainfall especially over the southern and eastern Ozarks.
• Flash Flood and Lightning Strike in Hawaii, May 1 to 3, 2011$50,000 · 14 eventsAn upper low in the area affected the Aloha State, bringing heavy rain and thunderstorms, and even small hail to parts of the Big Island of Hawaii and Maui. There were no reports of serious injuries. The costs of physical damages were not available.
• Flash Flooding and Flooding in Indiana, May 2, 201113 eventsStorms developed across southern Indiana just to the north of a frontal boundary stalled along the Ohio River. A LLJ impinging on the boundary and a shortwave over southern Illinois helped to enhance shower and thunderstorm activity.
• Flash Flood and Hail in Tennessee, May 2 to 3, 2011$36,000 · 1 in hail · 11 eventsSevere thunderstorms occurred across seven Middle Tennessee counties during the late afternoon through early evening hours on Monday, May 2nd. This resulted in funnel cloud, large hail, and thunderstorm wind damage reports, along with a flash flooding event.
• Flooding in Kentucky, May 3 to 7, 20116 eventsArea streams were running at high levels after flooding in April. A slow moving frontal boundary set off more heavy rains on May 2nd and 3rd. This caused renewed flooding on area streams.
• Flooding and Heavy Rain in Kentucky, May 3, 20116 eventsA nearly stationary front stretched from eastern KY through northern AL the morning of May 3. The area was also under the right entrance region of an upper level jet.
• Flooding in Kentucky, May 3, 2011$8,000 · 4 eventsAn area of showers and thunderstorms moved across the area during the morning hours. This heavy rain caused flooding across the region.
• Flash Flooding and Damaging Winds in Pennsylvania, May 3, 2011$8,000 · 50 kt wind · 6 eventsA broken line of severe thunderstorms formed ahead of a cold front during the late afternoon, and produced localized wind damage and heavy rainfall across portions of east-central Pennsylvania.
• Flooding in Mississippi, May 4 to 31, 20111 death · $11 million · 10 eventsThe flood of 2011 had its birth around the end of March when heavy rainfall of 2 to 5 inches fell across Arkansas, Southeast Missouri, and the Ohio River Valley.
• Flood in Arkansas, May 5 to 31, 2011$2.2 million · 1 eventThe flood of 2011 had its birth around the end of March when heavy rainfall of 2 to 5 inches fell across Arkansas, Southeast Missouri, and the Ohio River Valley.
• Flood in Louisiana, May 5 to 31, 2011$50,000 · 1 eventSnow melt in the central and northern United States and heavy springtime rainfall in the Ohio Valley and Tennessee Valleys contributed to significant flooding along the lower Mississippi River. The magnitude of flooding was comparable to the floods of 1927, 1983, and 1993.
• Flooding in Louisiana, May 6 to 31, 2011$25 million · 4 eventsThe flood of 2011 had its birth around the end of March when heavy rainfall of 2 to 5 inches fell across Arkansas, Southeast Missouri, and the Ohio River Valley.
• Flash Flooding and Heavy Rain in Hawaii, May 6 to 10, 20119 eventsAn upper trough remaining near the islands triggered heavy rain, thunderstorms, and flash flooding over much of the Aloha State. There were no serious injuries reported. Costs of any property damages were not available.
• Flood in Arkansas, May 6 to 9, 2011$15,000 · 1 eventThe Saline River at Rye rose above flood stage during the first week of May as a result of heavy rainfall and high water upstream.
• Flash Flooding and Hail in Indiana, May 7 to 8, 2011$17,000 · 1.5 in hail · 10 eventsA few thunderstorms pushed southeast out of east-central Illinois into central Indiana during the evening of May the 7th. One storm in particular, produced numerous large hail reports out of Vigo County. Flash flooding was also observed in Vigo County.
• Flood in Utah, May 8 to 9, 2011$50,000 · 1 eventSnowmelt and heavy rain caused flooding on the Blacksmith Fork River. This minor flooding caused several road closures around the towns of Logan and Millville.
• Flood in Alaska, May 8 to 12, 2011$1.5 million · 1 eventIce jam flooding along the Kuskokwim River at Crooked Creek and Red Devil caused significant damage. Ten homes were destroyed in Crooked Creek and 14 sustained damage. Four homes were damaged in Red Devil.
• Flash Flooding in North Dakota, May 9, 2011$11,000 · 2 eventsIn the early morning hours of the 9th, a cluster of elevated thundestorms moved from eastern South Dakota into western Minnesota. One storm dropped large hail near Norcross in Grant County (MN), which was the first severe thunderstorm event of the season.
• Flash Flood and Hail in Wyoming, May 9, 2011$163,000 · 1.5 in hail · 3 eventsA thunderstorm developed over Newcastle and remained over the city for over an hour. It produced ping-pong ball sized hail and heavy rain, which caused flash flooding.
• Flash Flooding and Flooding in South Dakota, May 9 to 10, 20118 eventsFlash flooding occurred over portions of northwestern South Dakota when three to four inches of rain fell in three hours.
• Flooding in Montana, May 10 to 17, 20116 eventsA significant spring storm impacted south central Montana May 8-11 as a moist and slow moving storm system impacted the region. Rain began to move into the region late Sunday, May 8th with the heaviest rainfall Monday into Tuesday.
• Flooding in Montana, May 10 to 14, 20114 eventsHeavy rains in Petroleum and Garfield counties swelled creeks and resulted in higher levels on the Musselshell River to above Flood Stage.
• Flooding in Montana, May 10 to 11, 20114 eventsHeavy rain fell in many areas of Valley, McCone, Garfield and Dawson counties where up to 2.5 inches fell, swelling creeks and rivers.
• Flash Flood and Hail in Virginia, May 10, 2011$15,000 · 2 in hail · 20 eventsStrong to severe storms developed along a warm front that stretched from Indiana southeast into the Carolinas.
• Flash Flooding and Hail in Kentucky, May 10 to 11, 2011$2.0 million · 1.75 in hail · 19 eventsRepetitive showers and thunderstorms, moved southeast through southeast Ohio and into portions of northeast Kentucky between 1500E and 1830E on Tuesday, the 10th. In northeast Kentucky, the heaviest rains fell in eastern Greenup County and Boyd County.
• Flash Flooding and Flooding in Ohio, May 10 to 12, 20111 death · $385,000 · 1.75 in hail · 60 eventsA very unstable airmass was in place south of a warm front in the area. This unstable airmass led to the development of widespread severe weather.
• Flash Flooding and Hail in Ohio, May 10 to 11, 2011$19 million · 1.75 in hail · 14 eventsRepetitive showers and thunderstorms, moved southeast through western Vinton County, Jackson County, and western and central portions of Lawrence County between 1500E and 1830E on Tuesday, the 10th. This convection was just northeast of the surface warm front.
• Flash Flooding and Hail in West Virginia, May 10 to 11, 2011$530,000 · 1 in hail · 9 eventsRepetitive showers and thunderstorms, moved southeast through southeast Ohio and into portions of northeast Kentucky, and western West Virginia between 1500E and 1900E on Tuesday, the 10th. This convection was just northeast of a warm front.
• Flooding in North Dakota, May 11 to 31, 2011$400,000 · 4 eventsThis was part of historic flooding in North Dakota with statewide costs estimated around 1.5 billion dollars. Flooding was the result of significant winter snows and significant spring rains, not only in North Dakota but in Montana as well.
• Flash Flooding and Flood in Kentucky, May 11, 2011$106,000 · 1.25 in hail · 12 eventsA small cluster of strong to severe thunderstorms led to isolated instances of large hail, flash flooding, and tree damage in Johnson and Floyd counties during the overnight hours of May 11th.
• Flood and Hail in Oklahoma, May 11, 2011$16,000 · 61 kt wind · 21 eventsA powerful storm system moved through the inter-mountain west toward the southern Plains late on the 10th and into the 11th. Thunderstorms developed very early over eastern New Mexico/West Texas, as a lead disturbance rotated around main storm system.
• Flash Flooding and Hail in Michigan, May 11, 2011$194,000 · 1.5 in hail · 7 eventsA large area of showers and thunderstorms impacted Northern Michigan for much of the day on the 11th. The storms produced isolated severe weather and excessive rainfall, along with an area of high winds associated with a wake low trailing well behind the storms.
• Flash Flood and Hail in Texas, May 11, 20111.75 in hail · 13 eventsA shortwave and dryline combined to produce scattered severe thunderstorms. The main impacts with these thunderstorms were strong gusty winds and large hail.
• Flash Flooding and Hail in Texas, May 11 to 12, 2011$51,000 · 1.75 in hail · 55 eventsAn upper level area of low pressure moved out of the southern Rockies into the plains and combined with a dryline to produce severe thunderstorms on successive days. On May 11th the storms were mainly in the northeastern part of the forecast area.
• Flooding and Hail in Illinois, May 11, 2011$9,000 · 1.5 in hail · 25 eventsStrong to severe thunderstorms moved across many areas of northern Illinois during the afternoon and evening hours of May 11th.
• Flash Flood and Heavy Rain in Hawaii, May 11 to 14, 20116 eventsA surface trough west of the Garden Isle of Kauai caused inclement weather across Kauai and Oahu, triggering showers and thunderstorms. No serious injuries were reported. Costs of damages were not available.
• Flash Flooding and Flooding in Ohio, May 12 to 14, 2011$632,000 · 1.75 in hail · 35 eventsDuring the evening and nighttime hours of May 11th, an area of low pressure located over southern Wisconsin slowly progressed northeast over the upper Great Lakes. A frontal boundary extended southeast of the low, across portions of Indiana into southern Ohio.
• Flood and Hail in Ohio, May 12, 2011$20,000 · 1.75 in hail · 6 eventsSevere thunderstorms developed along a slow moving warm front that was positioned northwest to southeast across Ohio. Thunderstorms developed and rode along the front during both the morning and afternoon hours.
• Flash Flooding and Hail in West Virginia, May 12, 2011$35,000 · 1.75 in hail · 9 eventsPredawn convection was in northern and eastern Ohio, along a slowly moving warm front. The convection dropped southeast around the eastern side of the mid level ridge. Storms pulsed stronger, causing some large hail.
• Flash Flood and Hail in Texas, May 12, 2011$15,000 · 50 kt wind · 7 eventsA large complex of thunderstorms, that developed during the early morning hours south of Del Rio, moved across the entire South Texas region during the afternoon of May 12th. There were several reports of strong winds with these storms and a few reports of small hail.
• Flash Flood and Hail in Virginia, May 12, 2011$2,000 · 2 in hail · 18 eventsNorthwesterly flow aloft continued the pattern of storminess over the mountains as disturbances dropped southeast along the periphery of the upper ridge. Storms developed in the early afternoon and dropped mainly hail and heavy rain across several counties.
• Debris Flow and Flooding in Washington, May 12 to 17, 2011$46,000 · 8 eventsA wet spring season resulted in saturated soils across the Inland Northwest. Rivers, small streams, and creeks began to rise as warming temperatures on May 13th and 14th melted mountain snowpack across the east slopes of the northern Cascades and Northeast Mountains.
• Flash Flooding and Hail in Oklahoma, May 12, 2011$205,000 · 3 in hail · 25 eventsA cold front moved into and across the region during the afternoon and evening of the 12th. A warm, moist, and unstable air mass existed over eastern Oklahoma ahead of the front.
• Flash Flooding and Flood in Nebraska, May 12 to 13, 2011$4,000 · 1.75 in hail · 26 eventsSevere thunderstorms, some which produced heavy rain and flash flooding, tracked across eastern Nebraska for the second consecutive day. The storms were focused along two boundaries.
• Flooding and Hail in West Virginia, May 12, 2011$20,000 · 0.75 in hail · 3 eventsSevere thunderstorms developed along a slow moving warm front that was positioned northwest to southeast across Ohio. Thunderstorms developed and rode along the front during both the morning and afternoon hours.
• Flash Flooding and Hail in Arkansas, May 12, 2011$180,000 · 1.75 in hail · 9 eventsA cold front moved across northwestern Arkansas during the evening of the 12th. A warm, moist, and unstable air mass existed over the region ahead of the front.
• Flood in Pennsylvania, May 12, 2011$15,000 · 1 eventSevere thunderstorms developed along a slow moving warm front that was positioned northwest to southeast across Ohio. Thunderstorms developed and rode along the front during both the morning and afternoon hours.
• Flooding in Utah, May 13 to 18, 2011$550,000 · 2 eventsMore river flooding occurred across northern Utah in mid-May. The main rivers that were impacted were the Blacksmith Fork River and the South Fork of the Ogden River.
• Flash Flooding and Hail in Virginia, May 13, 2011$90,000 · 1 in hail · 18 eventsAn upper level storm system approaching from the west helped to trigger numerous showers and thunderstorms mainly over the Appalachians and Blue Ridge Mountains.
• Flooding and Hail in Pennsylvania, May 13 to 14, 2011$110,000 · 0.88 in hail · 16 eventsA low pressure system and its associated warm front were slowly progressing through the Ohio valley bringing numerous rounds of showers and thunderstorms.
• Flooding and Hail in Ohio, May 13, 2011$40,000 · 1 in hail · 5 eventsA low pressure system and its associated warm front were slowly progressing through the Ohio valley bringing numerous rounds of showers and thunderstorms.
• Flash Flood and Hail in North Carolina, May 13, 20111 in hail · 8 eventsAn upper level storm system approaching from the west helped to trigger numerous showers and thunderstorms mainly over the mountainous terrain of northwest North Carolina.
• Flash Flood and Hail in Mississippi, May 13, 20111.75 in hail · 6 eventsA mesoscale convective system moved through the Mid-South during the morning hours. This system generated outflow boundaries that when combined with surface heating and an upper level disturbance moving through the region produced scattered thunderstorms later in the day.
• Flash Flooding and Flood in New York, May 13, 2011$830,000 · 11 eventsLow pressure moved across the Great Lakes bringing moist, unstable air to the region. Showers and thunderstorms developed along lake breeze boundaries and persisted through the late afternoon and evening hours across the western southern tier and western Finger Lakes Region.
• Flash Flood and Hail in Michigan, May 13, 2011$100,000 · 1 in hail · 5 eventsA surface trough dropping south through Saginaw Bay interacted with thunderstorms coming up from the south, producing heavy rainfall around the I-69 corridor, specifically in Genessee county where flash flooding occured.
• Flash Flooding and Hail in Illinois, May 13 to 14, 20111 in hail · 4 eventsLow pressure moving across central Illinois triggered scattered strong thunderstorms during the evening of May 13th. A few of the storms produced large hail and locally heavy rainfall across Tazewell County and Christian County.
• Debris Flow and Flooding in Washington, May 14 to 23, 2011$4.3 million · 52 kt wind · 8 eventsAn upper level low pressure system moved over the Pacific Northwest. Moist and unstable conditions ahead of the low triggered widespread thunderstorms with heavy rainfall and isolated large hail. This combined with the abundant spring snow-pack and wet ground to cause flooding.
• Debris Flow in Wyoming, May 14 to 25, 2011$500,000 · 1 eventMud and debris began flowing onto US Highway 26/89 near milepost 127 in the Snake River Canyon on Saturday morning, May 14, as a result of rapid snowmelt in the area of Double Draw.
• Flash Flood and Debris Flow in Puerto Rico, May 14 to 18, 2011$365,000 · 53 kt wind · 9 eventsA broad trough associated with a persistent surface low north of the area and a wide northeast to southwest swath of moisture south of Puerto Rico moved very slowly east and created a highly unstable environment across the local area.
• Flash Flooding and Flood in Ohio, May 14 to 15, 2011$65,000 · 12 eventsAn area of low pressure moved up from the Mississippi River Valley into Ohio. The storm system had adequate moisture from the Gulf of Mexico, which increased rainfall rates to over an inch and a half per hour.
• Flash Flood in West Virginia, May 14, 2011$50,000 · 1 eventA weak surface boundary rotated northeast through the area during the afternoon of the 14th. Short lines of thunderstorms developed in the afternoon heating, as clouds broke. Some repetitive showers caused narrow bands of heavy rain to fall.
• Heavy Rain in U.S. Virgin Islands, May 14 to 16, 20114 eventsMay 2011 ended as the fifth and eighth wettest May on record across St Thomas and St Croix respectively.The ASOS rainfall report from Cyril E. King Airport in St. Thomas was 8.04 inches for the month of May; 4.68 inches greater than the normal of 3.36 inches.
• Flash Flood and Flooding in Oregon, May 14 to 18, 2011$2.8 million · 1 in hail · 9 eventsAn upper level low pressure system moved over the Pacific Northwest. Moist and unstable conditions ahead of the low triggered widespread thunderstorms with heavy rainfall and isolated large hail.
• Flash Flooding and Flooding in Indiana, May 14 to 15, 2011$500,000 · 6 eventsA weak surface trough and low pressure system tracking along it allowed for thunderstorms to develop across portions of northeastern Indiana. Weak flow parallel to the trough and redevelopment of thunderstorms produced rainfall rates of one to two inches per hour.
• Flooding and Lightning Strike in Pennsylvania, May 14 to 16, 20111 injured · $25,000 · 6 eventsThunderstorms developed along a weak slow moving stationary front over Ohio. As was the case the days prior, storms were slow-moving causing flooding in northwestern Pennsylvania. Some wind damage was reported with the storms as they moved through the panhandle of West Virginia.
• Flooding in Idaho, May 15 to 17, 2011$25,000 · 2 eventsA wet spring season resulted in saturated soils across the Inland Northwest. Rivers, small streams, and creeks began to rise as temperatures warmed on May 13th and 14th as snowmelt infiltrated many watersheds across the Central Panhandle.
• Flood in Wyoming, May 15 to 19, 2011$200,000 · 1 eventLow elevation snowpack in the mountains bordering the west side of Star Valley melted rapidly as temperatures climbed into the 60s. The result was flooding along the Salt River and its tributaries.
• Flash Flooding and Flooding in West Virginia, May 17 to 18, 20119 eventsA nearly stationary area of upper level low pressure system over the Ohio Valley provided plenty of lift to combine with an usually strong and moist southeasterly low-level flow to produce bands of moderate to heavy showers across the mid-Atlantic.
• Flash Flooding and Flooding in Virginia, May 17 to 18, 201126 eventsA nearly stationary area of upper level low pressure system over the Ohio Valley provided plenty of lift to combine with an usually strong and moist southeasterly low-level flow to produce bands of moderate to heavy showers across the mid-Atlantic.
• Flash Flooding in Maryland, May 17 to 18, 20114 eventsA nearly stationary area of upper level low pressure system over the Ohio Valley provided plenty of lift to combine with an usually strong and moist southeasterly low-level flow to produce bands of moderate to heavy showers across the mid-Atlantic.
• Flooding in Montana, May 18 to 19, 201110 eventsAreas of heavy rain produced flooding on small streams in most of northeast Montana. The rainfall across the area during the month of May totaled 300 to 600 percent of normal.
• Flood and Hail in Pennsylvania, May 18, 2011$5,000 · 1 in hail · 3 eventsScattered severe thunderstorms developed in the afternoon in an area of instability and converegence as an upper level low meandered north and westward from the Appalachians.
• Flooding and Hail in Nebraska, May 19 to 20, 2011$795,000 · 1 in hail · 19 eventsFollowing a short stretch of dry days centered around mid-month, an abrupt transition to a very wet pattern arrived in parts of South Central Nebraska between the evening hours of Thursday the 19th and early morning hours of Friday the 20th.
• Flash Flooding and Flooding in Missouri, May 19, 201113 eventsA nocturnal thunderstorm complex moved across portions of west central and central Missouri. The storms were focused along a mid level boundary and produced as much as two to three inches of rain in some locations.
• Flooding in Montana, May 19 to 31, 2011$50,000 · 2 eventsHeavy rain and snowmelt caused several roads to be washed out as the Judith River and many small streams and creeks flooded. Flood declaration made for Judith Basin county on 5/23/11.
• Flooding in Montana, May 19 to 31, 2011$125,000 · 2 eventsHeavy rain and snowmelt resulted in flooding.
• Flash Flooding in New York, May 19, 2011$25,000 · 2 eventsA slow moving upper level low pressure system brought scattered showers and thunderstorms to upstate New York. Some of the storms brought heavy rainfall, and isolated storms produced flash flooding.
• Flash Flooding in Pennsylvania, May 19, 20114 eventsAn upper air disturbance helped trigger thunderstorms during the afternoon of the 19th. The thunderstorms were training and not fast movers. Coupled with the recent run of wet weather helped cause flash flooding in eastern parts of the Poconos and Lehigh Valley.
• Flood and Hail in Kansas, May 19 to 20, 2011$110,000 · 1.75 in hail · 33 eventsThunderstorms developed during the afternoon along a poorly defined dry line but had upper level support from a short wave trough.
• Flash Flood in Pennsylvania, May 19, 2011$15,000 · 1 eventA slow moving upper level low pressure system brought scattered showers and thunderstorms to northeast Pennsylvania. Some of the storms brought heavy rainfall, and isolated storms produced flash flooding.
• Flash Flood in New York, May 19, 2011$150,000 · 1 eventA nearly stationary thunderstorm dropped about three inches of rain over Little Valley in Cattaraugus county in a little over an hour’s time. Many streets were closed some with over two feet of water over them virtually shutting down the village.
• Flash Flooding in New York, May 19 to 20, 20117 eventsA stacked low pressure system moved eastward from the Ohio Valley to Pennsylvania during the day Thursday, May 19th. Several upper level disturbances rotating around the low aided in the development of numerous showers and thunderstorms.
• Flooding and Hail in Nebraska, May 19 to 23, 2011$12,000 · 1 in hail · 9 eventsThunderstorms developed over eastern Nebraska during the evening of 5/19 ahead of a large upper level low pressure system over the Rocky Mountains and north of a warm front in Kansas.
• Flood and Hail in Kansas, May 19 to 20, 20111.25 in hail · 14 eventsAn upper level jet streak provided the dynamics to help produced thunderstorms during the afternoon and early evening. Some of the storms became severe.
• Flash Flooding in New York, May 20, 2011$80,000 · 6 eventsWidespread showers and a few thunderstorms developed across upstate New York as a slow moving upper level low pressure system rotated across the area. These showers and thunderstorms produced heavy rainfall, and resulted in flash flooding for parts of the area.
• Flooding and Heavy Rain in Nebraska, May 20 to 21, 2011$1.6 million · 5 eventsOnly 12-24 hours after significant rainfall drenched eastern sections of South Central Nebraska resulting in considerable lowland flooding and closure of several county roads, another round of heavy rain-producing storms flared up mainly between 2 PM and 9 PM CDT on Friday the…
• Flooding in South Dakota, May 20 to 31, 20116 eventsThe Missouri River, which had been near flood stage in many areas, began a significant rise near the end of the month in response to widespread upstream heavy rain which fell after unusually large upstream snowmelt.
• Flooding and Hail in Missouri, May 20, 20110.88 in hail · 11 eventsA broad area of rain moved over the Missouri Ozarks as moisture from the Gulf of Mexico and a subtropical fetch combined with an upper level disturbance. This produced heavy rainfall across portions of the Ozarks along with a few strong to marginally severe thunderstorms.
• Flash Flooding and Debris Flows in Puerto Rico, May 20, 201111 eventsAn upper level trough combined with ample moisture to produce very heavy rainfall across most of Puerto Rico.
• Flooding in Montana, May 20 to 31, 20112 deaths · $14 million · 13 eventsA Pacific low moved into the four corners region on the 17th and migrated northeast into the Dakotas through the 22nd, bringing another round of heavy precipitation aided by a tap of Gulf of Mexico moisture.
• Flood in Wyoming, May 20 to 23, 2011$520,000 · 1 eventA Pacific low moved into the four corners region on the 17th and migrated northeast into the Dakotas through the 22nd, bringing a round of heavy precipitation aided by a tap of Gulf of Mexico moisture.
• Flooding in Montana, May 20 to 29, 20119 eventsThis flooding occurred in a large portion of northeast Montana.
• Heavy Rain in North Dakota, May 20, 20116 eventsA slow moving upper level low pressure system brought widespread rainfall to west and central North Dakota on May 20th. A few areas received heavy amounts of precipitation, which contributed to increased river levels and ongoing overland flooding.
• Flash Flooding and Flood in Texas, May 20, 2011$110,000 · 1.75 in hail · 32 eventsScattered thunderstorms developed across North Texas and primarily produced hail that was less than golfball sized in diameter. There were a couple of reported microbursts as well.
• Flash Flooding and Hail in New York, May 20, 20110.75 in hail · 9 eventsA vertically stacked upper level low moved slowly over eastern Pennsylvania, New Jersey and southern New York on Friday, May 20th. The surface low moved to near Long Island by the early afternoon.
• Flash Flooding and Lightning Strike in Vermont, May 20, 2011$585,000 · 5 eventsSlow moving thunderstorms produced excessive runoff across portions of Vermont, resulting in localized flash flooding.
• Flood in South Dakota, May 20 to 31, 2011$300,000 · 1 eventHeavy rain runoff on saturated ground caused record flooding along the Little Missouri River.
• Flooding in Arkansas, May 21 to 31, 2011$105,000 · 7 eventsAdditional heavy rainfall and additional releases from area lakes caused some rivers to rise back above flood stage during the month of May.
• Flash Flood and Hail in Nebraska, May 21, 20111.75 in hail · 27 eventsScattered severe thunderstorms developed over eastern Nebraska during the afternoon of May 21 and tracked and developed into western Iowa during the early to mid evening hours.
• Flash Flooding in Maine, May 21, 2011$130,000 · 2 eventsTraining showers and thunderstorms dropped 2 to 4 inches of rain in a very short period of time causing road washouts and culvert failures. An observer in Greene reported 3.5 inches of rain in 30 minutes.
• Flooding in Utah, May 22 to 31, 2011$710,000 · 4 eventsWarm temperatures and fast snowmelt caused widespread river flooding across Utah through the end of May. Major rivers impacted included the Sevier River, the South Fork of the Ogden River, and much of the Weber River system. Note that this episode continued into June.
• Flood in North Dakota, May 22 to 29, 2011$50,000 · 1 eventThis was part of historic flooding in North Dakota with statewide costs estimated around 1.5 billion dollars. Flooding was the result of significant winter snows and significant spring rains. Flooding was along the Little Missouri River through Medora.
• Flooding in Montana, May 22 to 31, 20114 eventsHeavy rain that resulted in swollen tributaries contributed to high river levels on the Milk that lasted well into June in some places.
• Flash Flood and Flood in Ohio, May 22, 2011$61,000 · 2 in hail · 26 eventsA weak mid level shortwave combined with moderate instability to produce severe thunderstorms with hail. These storms later evolved into heavy rain producing storms.
• Flooding in Iowa, May 22 to 31, 2011$525,000 · 9 eventsAs has been the case in recent months, Iowa saw many large variations in temperature. The first six days of the month were much cooler than usual with temperatures falling to 20 at Sibley and Spencer on the 3rd.
• Flash Flooding and Hail in Virginia, May 22 to 23, 2011$15,000 · 1.75 in hail · 23 eventsScattered thunderstorms spread eastward from a strong mesoscale system over Kentucky and Tennessee in the early evening and continued for several hours.
• Flash Flood and Hail in North Carolina, May 22, 20111.75 in hail · 4 eventsScattered thunderstorms spread eastward from a strong mesoscale system over Kentucky and Tennessee in the early evening and continued for several hours.
• Flood in Wyoming, May 22 to 29, 2011$30,000 · 1 eventLower elevation snowmelt in the southern Wind River Range generated minor flooding along the Sweetwater River.
• Flash Flooding in Missouri, May 22 to 25, 2011$1.8 million · 17 eventsA slow moving upper level trough and low pressure system across the central plains region moving across the Ozarks caused numerous heavy showers and storms that produced heavy rainfall. This lead to additional flooding and flash flooding across the Ozarks.
• Flash Flood and Hail in Tennessee, May 22 to 23, 20111 in hail · 4 eventsA broad upper level trough over the center of the country combined with a leftover outflow boundary across the Mid-South to produce numerous thunderstorms over Southwest Tennessee and Northeast Arkansas.
• Flash Flooding and Hail in Kentucky, May 23, 20111 in hail · 28 eventsDuring the predawn hours of May 23 an MCS moved in from the west and pushed across the region. Additionally, convection fired ahead of the MCS in the moist atmosphere with the storms being fueled by a 50 kt. LLJ.
• Flooding in Montana, May 23 to 29, 20114 eventsA slow moving upper level low pressure system was tapping into an area of moisture that was surging north from the southern Plains states. 2 to 4 inches of rain fell across the area between May 20th and the 22nd.
• Flash Flooding and Flood in Ohio, May 23, 2011$14,000 · 3 eventsA short wave trough moved eastward across the area during the morning hours. The main threat from these storms was flooding.
• Flash Flood and Flood in Texas, May 23, 2011$51,000 · 1.75 in hail · 24 eventsThunderstorms developed near the Metroplex during the late morning hours. These storms produced hail that was mostly nickel to quarter sized in diameter. Heavy rainfall led to some localized flooding in the Metroplex.
• Flooding in Montana, May 23 to 31, 2011$6.0 million · 3 eventsA Pacific low moved into the four corners region on the 17th and migrated northeast into the Dakotas through the 22nd, bringing another round of heavy precipitation aided by a tap of Gulf of Mexico moisture.
• Flash Flooding and Hail in Arkansas, May 23 to 24, 20114 deaths · $51,000 · 1 in hail · 20 eventsThunderstorms developed during the early morning hours across northeastern Oklahoma and southeastern Kansas in response to an approaching upper level disturbance and increasing low level jet.
• Flash Flood and Damaging Winds in New York, May 23, 2011$110,000 · 52 kt wind · 5 eventsThunderstorms developed in warm, humid air as a cold front approached the region during the afternoon hours. The thunderstorms produced wind gusts measured to 52 knots. The thunderstorm winds downed trees and power lines in Findley Lake, Clymer, Panama and Busti.
• Flash Flooding and Hail in Kentucky, May 24, 2011$155,000 · 1 in hail · 26 eventsSeveral rounds of strong to severe thunderstorms caused sporadic wind damage and dropped up to nickel size on portions of eastern KY throughout the day on May 24th.
• Flooding and Heavy Rain in Kansas, May 24 to 25, 2011$1.1 million · 8 eventsThe time frame between the early morning hours of Tuesday the 24th into the day on Wednesday the 25th brought widespread heavy rainfall and flooding to much of North Central Kansas, in what turned out to be the second of three significant heavy rainfall events within a 2-week…
• Flash Flooding and Damaging Winds in Kansas, May 24, 20111 injured · $17,000 · 61 kt wind · 10 eventsA strong upper level trough across the central plains region and an upper level disturbance along with a frontal boundary in the area produced numerous severe storms.
• Flash Flood and Hail in North Carolina, May 24, 2011$10,000 · 2 in hail · 24 eventsTwo distinct upper level storm systems passed through the area, one in the late morning, the second during the late afternoon and early evening. Each brought a round of active severe weather to the region.
• Flash Flooding and Flood in Colorado, May 24, 20111 in hail · 8 eventsA slow-moving upper low pressure area moved across the region during the afternoon. A line of severe thunderstorms developed over Colorado in the morning and moved into western Kansas during the afternoon.
• Flash Flooding in Montana, May 24, 20111 death · 2 eventsA slow moving area of thunderstorms produced heavy rain over Western Big Horn and South Central Yellowstone Counties.
• Flash Flood in Wyoming, May 24, 2011$50,000 · 1 eventFlash flooding occurred in Upton when a slow moving thunderstorm brought two inches of rain in less than one hour.
• Flooding and Heavy Rain in Nebraska, May 24 to 25, 2011$2.1 million · 15 eventsFor western and southern portions of South Central Nebraska, the time frame from the early morning hours of Tuesday the 24th through the day on Wednesday the 25th ended up being the overall rainiest 36-hour period of the spring.
• Flood in Wyoming, May 24 to 31, 2011$25,000 · 1 eventSnowmelt and rain combined to raise water levels on the Salt River in Star Valley.
• Flash Flooding and Hail in Illinois, May 25 to 26, 2011$40,000 · 1 in hail · 8 eventsA low pressure system brought showers and thunderstorms to eastern Iowa, northeast Missouri, and northwest Illinois during the afternoon and evening of May 25.
• Flooding in Michigan, May 25 to 26, 2011$200,000 · 2 eventsTwo to four inches of rain fell along the I-94 corridor leading to flooding.
• Flash Flood and Hail in Illinois, May 25, 20111.75 in hail · 21 eventsStrong area of low pressure moved into the forecast area with a dry line out ahead of the main cold front. Storms fired up along and just ahead of the dry line beginning in the early afternoon hours.
• Flash Flood and Hail in Indiana, May 25, 2011$29,000 · 3 in hail · 16 eventsA strong low pressure system west of the Ohio Valley approached during peak heating on May 25th. This resulted in the development of widespread severe thunderstorms with large hail and damaging winds during the afternoon and evening hours.
• Flash Flood and Hail in Mississippi, May 25, 20111.25 in hail · 12 eventsA developing surface low moved into the Mid Mississippi Valley while the associated cold front moved toward the Mid South on the afternoon of May 25, 2011.
• Flash Flooding and Hail in Mississippi, May 25 to 26, 2011$317,000 · 2 in hail · 20 eventsA powerful, late season, low pressure system brought numerous thunderstorms to the Deep South starting late in the evening of May 25th, continuing into the early morning hours of May 26th. Several of these storms produced large hail and damaging winds.
• Flood in Washington, May 26 to 31, 2011$300,000 · 1 eventThis river flooding episode continues into June. A series of weather disturbances brought heavy rainfall to the Pacific Northwest. The heavy rainfall combined with snowmelt runoff led to flooding on the Columbia River.
• Flooding in Nebraska, May 26 to 31, 2011$60,000 · 4 eventsHigh releases from upstream reservoirs brought increasing flows and flooding along the Missouri River downstream of Gavins Point Dam.
• Flooding in Iowa, May 26 to 31, 2011$15,000 · 2 eventsHigh releases from Gavins Point Dam caused the Missouri River to begin flooding upstream of the Platte River beginning in mid to late May. The flooding continued into June.
• Flash Flooding and Flood in Vermont, May 26 to 27, 2011$11 million · 2.5 in hail · 83 eventsA surface low as well as upper atmospheric energy traveled along a quasi-stationary boundary across northern New York and Vermont during the afternoon and evening of May 26th.
• Flash Flood and Hail in Virginia, May 26, 2011$195,000 · 1.75 in hail · 34 eventsThe atmosphere quickly became very unstable on the afternoon of May 26th, which resulted in the development of severe thunderstorms, mainly in the mountains and foothills. These storms were primarily large hail producers.
• Flash Flood and Hail in North Carolina, May 26, 2011$21,000 · 1.75 in hail · 11 eventsThe atmosphere quickly became unstable during the afternoon of May 26th resulting in the development of severe thunderstorms in northwest North Carolina. The first storms were primarily hail producers, but in the evening, a line of storms started forming in Western NC.
• Flash Flooding and Flood in New Hampshire, May 26 to 27, 2011$1.1 million · 8 eventsA stationary front located through northern New Hampshire provided a focus for showers and thunderstorms to develop. Due to the slow movement of the storms rainfall rates were high resulting in flash flooding.
• Debris Flows and Flooding in Washington, May 27 to 31, 2011$39,000 · 4 eventsA wet spring season continued for the Inland Northwest during the last week of May as another, wet storm system moved through the region producing in the neighborhood of half to one and a half inches of liquid precipitation over Northern Washington May 25-26th.
• Flash Flooding and Hail in North Carolina, May 27, 2011$27,000 · 1.75 in hail · 25 eventsWith moisten laden air in place, a series of upper level disturbances in advance of an upper level trough moving into the area from the Tennessee Vally produced heavy rainfall of 3 to 5 inches along with severe hail and and isolated thunderstorm wind damage.
• Flash Flooding and Debris Flows in Puerto Rico, May 27 to 28, 201112 eventsAmple low level moisture combined with strong daytime heating and local effects to produce numerous showers with thunderstorms across the Cordillera Central.
• Flash Flooding and Damaging Wind in New York, May 27 to 28, 2011$910,000 · 50 kt wind · 4 eventsA surface low as well as upper atmospheric energy traveled along a quasi-stationary boundary across northern New York during the afternoon of May 27th.
• Flash Flooding in Maryland, May 27, 20116 eventsA nearly stationary front drifted east into western Maryland during the afternoon. Thunderstorms trained over the same area for several hours across locations that had saturated ground. Flash flooding resulted in Allegany County.
• Flash Flooding and Hail in New York, May 28, 2011$13 million · 1.75 in hail · 11 eventsA warm and humid air mass was over the region and had been in place for several days. A slow moving surface boundary was draped across the North Country and extended westward towards western New York and Lake Ontario.
• Flash Flood and Flooding in Illinois, May 28, 20110.88 in hail · 4 eventsStrong thunderstorms moved across parts of northern Illinois during the late afternoon and evening hours of May 28th, producing small hail and heavy rain, which produced some flooding.
• Flash Flood and Hail in Illinois, May 29, 2011$213,000 · 1 in hail · 7 eventsThunderstorms initiated across eastern Iowa during the morning of May 29th, then tracked eastward along a stationary frontal boundary into north-central Illinois. A large bow echo signature developed, with the strongest winds remaining north of a Galesburg to Henry line.
• Flash Flood and Hail in Illinois, May 29, 2011$106,000 · 1 in hail · 11 eventsA warm front stretching from southwest Kansas to northern Ohio pushed humid air into eastern Iowa, northeast Missouri, and northwest Illinois during the early morning hours of May 29.
• Flash Flooding and Flooding in Illinois, May 29, 2011$555,000 · 1 in hail · 17 eventsStrong to severe thunderstorms moved across many areas of northern Illinois from late morning through late afternoon on May 29th producing damaging winds, large hail and heavy rain, which caused flash flooding in some areas.
• Flooding in Iowa, May 29 to 30, 2011$110,000 · 3 eventsAnother storm system moved across the state late in the month. The heaviest rain fell over the south half of the state. This resulted in a short duration flooding event along the lower Des Moines River Basin and its tributaries.
• Flash Flooding in Vermont, May 30, 2011$125,000 · 2 eventsThunderstorms developed along a nearly stationary cold front across central and northeast Vermont. Heavy rainfall from the storms produced localized flash flooding.
• Flooding in Montana, May 29 to 31, 20114 eventsAn additional two inches of rain fell across the area, bringing flooding to creeks and streams in the area.
• Flash Flooding in New Hampshire, May 30 to 31, 2011$321,000 · 6 eventsA stationary front located through northern New Hampshire provided a focus for showers and thunderstorms to develop. Due to the slow movement and the training of the storms rainfall rates were high and resulted in flash flooding.
• Flash Flood and Damaging Winds in Michigan, May 30, 2011$2,000 · 58 kt wind · 8 eventsA low pressure system approaching from the Northern Plains triggered thunderstorms with heavy rain over portions of western Upper Michigan on the afternoon of the 30th. A severe thunderstorm produced wind gusts in excess of 60 mph at Freda in Houghton County.
• Lakeshore Flood in Vermont, June 1 to 18, 20115 eventsRecord Flooding occurred along the shores of Lake Champlain from mid-April to mid-June.
• Flooding in Nebraska, June 1 to 30, 20112 deaths · $4.3 million · 11 eventsA record rain event in May in eastern Montana combined with high water from storms in April and May (and early spring snow melt) and brought high water to the Missouri River chain of reservoirs.
• Flooding in Mississippi, June 1 to 17, 2011$959,000 · 4 eventsThe flood of 2011 had its birth around the end of March when heavy rainfall of 2 to 5 inches fell across Arkansas, Southeast Missouri, and the Ohio River Valley.
• Flooding in Iowa, June 1 to 30, 2011$880,000 · 5 eventsA record rain event in May in eastern Montana combined with high water from other storms in April and May and brought high water to the Missouri River chain of reservoirs. Water levels were further increased by the melting of a above normal snow pack in the northern Rockies.
• Flooding in Louisiana, June 1 to 17, 2011$900,000 · 3 eventsThe flood of 2011 had its birth around the end of March when heavy rainfall of 2 to 5 inches fell across Arkansas, Southeast Missouri, and the Ohio River Valley.
• Flooding in Arkansas, June 1 to 30, 2011$495,000 · 9 eventsAreal flooding continued into June, mainly in eastern parts of Arkansas. As water on the Mississippi River finally subsided, rivers in Arkansas were allowed to drain. In turn, the water level on smaller creeks and bayous decreased, allowing water to drain off of farmlands.
• Flooding in North Dakota, June 1 to 30, 2011$510,000 · 3 eventsWet weather continued through the month of June, causing the levels of Devils Lake and Stump Lake to hold fairly steady. Devils Lake started the month with an elevation of roughly 1454.25 feet MSL and ended the month of June at an elevation of roughly 1454.30 feet MSL.
• Flooding in Iowa, June 1 to 8, 2011$450,000 · 3 eventsFlooding that took place along the upper part of the Des Moines River Basin continued into the first part of June. Favorable conditions allowed the river to fall slowly through the first week with the flooding finally ending by the 8th.
• Flooding in Illinois, June 1 to 30, 2011$320,000 · 10 eventsThe weather pattern began to quiet down after the historic spring river flooding. With high pressure generally in control of the weather, the first half of June was very warm and dry.
• Flooding in Arkansas, June 1 to 30, 2011$360,000 · 7 eventsHeavy rainfall in April and May kept some rivers across the state above flood stage from late April through part of June. The White River at Augusta remained above flood stage from the last week of April through early July.
• Flooding in Missouri, June 1 to 30, 2011$30,000 · 6 eventsThe weather pattern began to quiet down after the historic spring river flooding. With high pressure generally in control of the weather, the first half of June was very warm and dry.
• Flooding in Indiana, June 1 to 7, 2011$20,000 · 2 eventsThe weather pattern began to quiet down after the historic spring river flooding. With high pressure generally in control of the weather, the first half of June was very warm and dry.
• Flooding in South Dakota, June 1 to 30, 20117 eventsMissouri River flooding continued in June with the river rising to record levels and having major impacts. The flooding forced evacuations of populated areas, affecting many homes, businesses, parks, recreation areas and other lowlands.
• Flooding in South Dakota, June 1 to 30, 20116 eventsModerate to major flooding on the James River continued through the month, with the river very slowly falling, then rising again due to heavy rains. Farmland and several roads near the river were flooded.
• Flooding in North Dakota, June 1 to 30, 20114 eventsThis was part of historic flooding in North Dakota with statewide costs estimated around 1.5 billion dollars. Flooding was the result of significant winter snows and significant spring rains, not only in North Dakota but in Montana as well.
• Flooding in North Dakota, June 1 to 30, 20114 eventsThis was part of historic flooding in North Dakota with statewide costs estimated around 1.5 billion dollars. Flooding was the result of significant winter snows and significant spring rains, not only in North Dakota but in Saskatchewan, Canada, as well.
• Flooding in Kentucky, June 1 to 3, 20114 eventsThe weather pattern began to quiet down after the historic spring river flooding. With high pressure generally in control of the weather, the first half of June was very warm and dry.
• Flooding in Utah, June 1 to 15, 2011$400,000 · 4 eventsWarm temperatures along with occasional heavy rain led to continued flooding across the state of Utah. Major rivers that experienced flooding included the Weber River, the Sevier River, and the South Fork of the Ogden River. Note that this episode began in May.
• Flood in Utah, June 1 to 30, 2011$125,000 · 1 eventSnow melt from a record snowpack caused extended high flows and river flooding on the main stem of the Colorado and Green Rivers in Grand County.
• Flood in Colorado, June 1 to 30, 2011$125,000 · 1 eventA record snowpack along the Colorado River basin caused an extended period of high river flows along the Colorado River across Mesa County in June.
• Flood in Utah, June 1 to 30, 2011$50,000 · 1 eventRapidly warming temperatures increased the runoff from a record snowpack over the Northeastern Utah mountains. This resulted in an extended period of high flows along many area waterways.
• Flood in Washington, June 1 to 18, 2011$1.2 million · 1 eventThis river flooding episode continues from May. A series of weather disturbances brought heavy rainfall to the Pacific Northwest. The heavy rainfall combined with snowmelt runoff to produce flooding on the Columbia River.
• Flash Flooding and Lightning Strikes in Hawaii, June 1 to 5, 20111 injured · $20,000 · 15 eventsAn upper low in the area caused showers and thunderstorms--even snow--over the Aloha State. Some of the rain was heavy enough to produce flash flooding over parts of the island chain. The costs of any property damage were not available.
• Flash Flooding and Flooding in Kansas, June 1 to 2, 2011$500 · 4.5 in hail · 87 eventsOn the afternoon of June 1, severe thunderstorms formed across northeast Kansas as a warm front lifted northward through the area. Most of these storms produced severe hail up to the size of golf balls, but some of the stronger storms brought hail up to the size of baseballs.
• Flash Flood and Hail in Kansas, June 1, 2011$25,000 · 1.75 in hail · 13 eventsScattered severe thunderstorms were observed across extreme eastern Kansas, during the evening hours of June 1, 2011. There were several reports of hail and damaging winds.
• Flash Flood in Washington, June 1, 2011$200,000 · 1 eventA cool upper-level trough centered over Eastern Washington produced unstable conditions on the afternoon of June 1st. Over northern Spokane County, scattered thunderstorms developed in the afternoon.
• Flooding in North Dakota, June 2 to 30, 2011$36 million · 6 eventsThis was part of historic flooding in North Dakota with statewide costs estimated around 1.5 billion dollars. Flooding was the result of significant winter snows and significant spring rains, not only in North Dakota but in Montana as well.
• Flash Flood and Heavy Snow in Oregon, June 1 to 2, 2011$70,000 · 2 eventsPersistent showers with heavy rainfall of 1 to 2 inches produced flooding on Willow and Hinton Creeks. Snowfall amounts in inches include 15 miles southeast of Heppner (6.5), Arbuckle Snotel (10), Madison Butte Snotel (6).
• Flash Flood and Flooding in Montana, June 3 to 28, 201115 eventsRain and snowmelt. Presidential Disaster Declaration for Montana made on 6/17/11.
• Heavy Rain and Strong Wind in California, June 4, 2011$20 million · 3 eventsA late season cold front worked its way into Northern and Central California producing strong wind and heavy rain resulting in problems for the agricultural community.
• Flash Flooding and Debris Flow in Puerto Rico, June 4 to 8, 20114 eventsBroad low pressure across the southwest Caribbean Sea produced a south to southwest wind transporting ample moisture across the local area. This led to periods of heavy rainfall across the region.
• Flash Flood and Flood in Indiana, June 4, 20111 death · 3 injured · $161,000 · 1.75 in hail · 39 eventsComing Soon.
• Flash Flooding and Flood in Ohio, June 4 to 5, 2011$425,000 · 1.75 in hail · 24 eventsA complex of thunderstorms developed along a warm front moving northeast across eastern Ohio and northwest Pennsylvania. Some of the thunderstorms were severe with the bulk of the wind damage and hail reports across eastern Ohio.
• Flood in Colorado, June 4 to 22, 2011$25,000 · 1 eventSnow melt from a record snowpack across the northern Colorado mountains caused extended high flows and river flooding along Moffat County waterways.
• Flash Flood in Illinois, June 5, 2011$25,000 · 1 eventShowers and thunderstorms tracked southeastward along a warm front draped across parts of southeast Iowa, northeast Missouri, and west central Illinois during the early morning hours of June 5. The storms produced hail, gusty winds, and heavy rain as they moved across the area.
• Flood in Colorado, June 5 to 30, 2011$1.8 million · 1 eventA record snowpack along the Colorado River basin caused extended high river flows and flooding along the the main stem of the Colorado River and numerous smaller waterways throughout Garfield County in June.
• Flooding in Montana, June 5 to 30, 20114 eventsRecord releases from the Fort Peck Dam with contributing flow from the Milk River combined to produce flooding on the Missouri River. A scheduled release of 65,000 cfs from Fort Peck Dam occurred from June 11 to 14, which exceeded the previous record release of 34,500 cfs.
• Flood in Montana, June 6 to 18, 2011$40,000 · 1 eventThe Clark fork river flooded homes and streets in the Orchard homes area of the city of Missoula. Streets and homes that were flooded include: Tower street, Kahrwald drive and Channel drive.
• Flooding in Washington, June 7 to 30, 2011$420,000 · 3 eventsFollowing a very wet April and May, warmer June temperatures began to melt an above normal mountain snowpack increasing flows into already swollen river basins. This caused moderate flooding along the Pend Oreille River and several of its tributaries.
• Flooding in Montana, June 7 to 9, 20114 eventsRunoff from heavy rainfall from overnight on the 6th-7th and during the 7th brought flooding to the area.
• Flooding in Montana, June 7 to 30, 20117 eventsThe combination of recent rainfall amounts of 2 to 4 inches across the area and mountain snow melt resulted in rapid water runoff and flooding. As a result, the Musselshell River rose above flood stage from Harlowton to Ryegate, as well as in the towns of Roundup and Musselshell.
• Flash Flood and Hail in Mississippi, June 7, 2011$654,000 · 1.75 in hail · 38 eventsAbundant low level moisture and hot afternoon temperatures allowed plenty of instability to develop during the afternoon and evening hours of June 7th, 2011.
• Flash Flooding and Flooding in Iowa, June 8 to 11, 2011$1.9 million · 1.75 in hail · 47 eventsAnother round of severe weather and heavy rain took place during the late afternoon and evening hours of the 9th, lasting into the early morning of the 10th. A strong shortwave lifted northeast across the area.
• Flash Flooding and Flooding in Illinois, June 8 to 9, 2011$1.2 million · 1.75 in hail · 44 eventsThunderstorms developed over northern Illinois during the late evening of June 8th and continued into the morning hours of June 9th. Many areas sustained wind damage and heavy rain caused flooding in some areas.
• Flash Flood in Vermont, June 9, 2011$25,000 · 1 eventA series of showers and thunderstorms moved across northern New York into Vermont during the pre-dawn hours of June 9th.
• Flash Flood and Hail in Illinois, June 9, 2011$150,000 · 1.25 in hail · 10 eventsShowers and thunderstorms, some severe, moved eastward across parts of eastern Iowa and northwest Illinois during the predawn hours of June 9. The stronger storms produced damaging winds and torrential rains, along with a few large hail stones.
• Flash Flooding in Indiana, June 9, 2011$15,000 · 2 eventsThunderstorms produced torrential rainfall across parts of northwest Indiana during the morning hours of June 9th. Flooding was reported in numerous areas. Rainfall totals ranged between 3 and 4 inches.
• Flash Flood and Hail in Virginia, June 9, 2011$283,000 · 1.5 in hail · 30 eventsDespite being under the influence by an area of high pressure, enough ridge top convergence of winds took place to help facilitate the development of isolated to scattered thunderstorms. A number of these storms reached severe levels with large hail and damaging winds.
• Flooding in Iowa, June 9 to 21, 2011$930,000 · 7 eventsRelatively dry weather prevailed for the first week of June allowing the completion of nearly of all of the corn and soybean planting. However, rainfall was frequent and sometimes excessive from the 8th through the 22nd.
• Flood and Hail in Pennsylvania, June 9, 2011$30,000 · 1.75 in hail · 14 eventsA weak cold front moved south across the upper Ohio Valley and produced scattered severe thunderstorms.
• Flash Flooding and Flooding in Missouri, June 9 to 10, 2011$500 · 3 in hail · 60 eventsA cold front approaching the region, caused a severe thunderstorm outbreak, during the afternoon and evening hours of June 9, 2011. There were numerous reports of hail and damaging winds.
• Flash Flooding and Hail in West Virginia, June 9 to 10, 2011$66,000 · 1 in hail · 11 eventsAn east to west oriented cold front sagged south into eastern Ohio and northern West Virginia during the early evening on the 9th. Temperatures reached the upper 80s with dew points near 70. There was very little convection over northern West Virginia at 1900E.
• Flash Flood and Lightning Strike in Iowa, June 10, 2011$50,000 · 2 eventsLightning struck a home in Cedar Rapids during an early morning thunderstorm June 10. In addition, heavy rains fell during the early morning hours resulting in some flash flooding in Cedar Rapids, IA.
• Flash Flooding and Hail in Indiana, June 10, 20111 in hail · 5 eventsA frontal boundary worked north into northern Indiana during the afternoon. A moderately unstable atmosphere was located south of the front with favorable freezing levels and shear.
• Flash Flood and Flood in Indiana, June 10 to 11, 20111 injured · $83,000 · 1 in hail · 27 eventsComing Soon.
• Flood in Wyoming, June 10 to 11, 2011$15,000 · 1 eventHeavy rain of one to two inches fell in Big Horn County causing the Big Horn River to swell and flood areas near the river.
• Debris Flow in Wyoming, June 10 to 13, 2011$165,000 · 1 eventThe melting of record snowpack combined with heavy rain to saturate soils in the western Bighorn Mountains. Land below a section of U.S. Highway 14 above Shell Falls gave way near milepost 31.5 making travel on the highway unsafe.
• Flash Flood and Hail in Ohio, June 10, 2011$32,000 · 1.25 in hail · 27 eventsNon-severe early morning convection over the Ohio River produced a deep outflow boundary across northern Kentucky, southeast Indiana, and southern Ohio. This boundary triggered the development of severe thunderstorms during the late morning through the afternoon in that area.
• Debris Flow and Flood in Washington, June 10 to 11, 2011$11,000 · 2 eventsA period of warm temperatures earlier in the month led to rapid rises on small streams as snow melt rapidly from mid and high elevations. High temperatures at low to mid elevations were in the upper 70s to low 80s June 4th through June 6th.
• Flash Flood and Hail in North Carolina, June 10, 2011$69,000 · 1 in hail · 14 eventsScattered storms developed during the afternoon heating of the day. A few of these storms produced damaging winds, and one produced large hail. One slow moving storm also caused isolated flash flooding.
• Flash Flooding and Hail in Missouri, June 10 to 11, 20112.75 in hail · 23 eventsA cold front was moving through the area triggering showers and thunderstorms. There were numerous reports of large hail, as well as damaging winds and flash flooding.
• Flash Flooding and Hail in Illinois, June 10 to 11, 20112 in hail · 12 eventsA cold front was moving through the area triggering showers and thunderstorms. There were numerous reports of large hail, as well as damaging winds and flash flooding.
• Flash Flood and Hail in Kentucky, June 11, 2011$21,000 · 1 in hail · 7 eventsA small cluster of strong to severe thunderstorms downed trees and produced large hail across portions of eastern KY on June 11th. The storms also produced some brief flash flooding in Pikeville.
• Flash Flooding and Flood in Montana, June 11 to 13, 20110.88 in hail · 5 eventsThunderstorms in Phillips County and heavy rain in eastern Valley and Roosevelt County resulted in non-severe hail and localized flooding across the area.
• Flash Flooding and Damaging Winds in North Carolina, June 11, 201150 kt wind · 9 eventsScattered strong to severe storms initially developed along the southern Appalachians, and moved eastward into the western Piedmont into an area of moderate instability. The severe storms produced mostly localized wet microburst.
• Flash Flooding in Pennsylvania, June 11, 201111 eventsSlow moving thunderstorms brought flash flooding to portions of the Lower Susquehanna Valley during the afternoon and evening. Soils were already saturated from heavy rainfall the night before which contributed to the flooding.
• Flash Flood and Hail in South Dakota, June 11, 2011$5,000 · 1 in hail · 4 eventsA severe thunderstorm moved across southern Fall River and southwestern Shannon Counties. The storm produced hail to quarter size and wind gusts near 60 mph. Runoff from heavy rain caused flash flooding in southeastern Fall River County.
• Flash Flood and Hail in South Dakota, June 12, 20111 in hail · 9 eventsA line of thunderstorms developed across Custer and Fall River Counties and tracked across southwestern South Dakota. Quarter sized hail and 70 mph wind gusts accompanied the storms.
• Flood in Nevada, June 12 to 30, 2011$50,000 · 1 eventSnowmelt from a much above normal snowpack combined with little reservoir storage (nearly full reservoirs) to cause minor to moderate flooding of lowlands in the Mason Valley from mid June through mid July.
• Flash Flood in Iowa, June 13, 2011$100,000 · 1 eventA federal levee southwest of Hamburg failed causing the Missouri River to flash flood across several farmsteads in the area and eventually across a highway and Interstate 29 then toward the Hamburg area.
• Flash Flooding and Hail in South Dakota, June 13, 2011$30,000 · 1.75 in hail · 8 eventsThunderstorms produced large hail and flash flooding near part of Interstate 90 including the Mitchell area during the afternoon and evening of June 13th.
• Flash Flooding and Damaging Winds in Illinois, June 13 to 14, 201161 kt wind · 7 eventsStorm complex over west central Illinois brought in a lot of precipitation as well as some reports of damaging winds.
• Flash Flood and Flood in Iowa, June 13 to 15, 2011$433,000 · 2 in hail · 15 eventsA warm front remained in place to the south of Iowa during the overnight hours of the 13th into the morning of the 14th. The airmass was very unstable to the south of the front with CAPE around 3500 J/kg and lifted indices of -7 to -9 C.
• Flash Flood in Illinois, June 14, 2011$250,000 · 1 eventHeavy rain-producing showers and thunderstorms kept developing and redeveloping north of a warm front across southeast Iowa, northeast Missouri and west central Illinois during the late evening of June 13 and early morning of June 14.
• Flooding in Iowa, June 14 to 30, 20115 eventsMinor to moderate flooding of the Little Sioux and Ocheyedan Rivers resulted from heavy rains, with lowlands including some farmland flooded.
• Flash Flooding and Hail in Minnesota, June 14, 2011$25,000 · 1 in hail · 7 eventsThunderstorms produced flash flooding at several locations in southwest Minnesota during the late morning and afternoon of June 14th. There was also a report of large hail and one of lightning damage.
• Flooding in Missouri, June 14 to 16, 2011$375,000 · 2 eventsHeavy rains on June 13th and 14th resulted in the Des Moines River at St. Francisville and the Fox River at Wayland going above their respective major flood stage levels.| |The Des Moines River at St.
• Flood in Iowa, June 14 to 15, 2011$125,000 · 1 eventHeavy rains during the second week of June resulted in the Des Moines River at St. Francisville going above the major flood stage level of 25 feet on June 14 around 1221 pm CDT. It crested around 26 feet around 7 am CDT June 15.
• Debris Flow in Wyoming, June 14, 2011$50,000 · 1 eventMelting of a substantial late-season snowpack caused mud and debris to flow across the Upper Hoback River Road in far west Sublette County. The flow occurred at mile 14 of the road and was several feet deep.
• Flash Flood and Hail in Iowa, June 14 to 15, 2011$335,000 · 0.88 in hail · 3 eventsThe atmosphere remained quite unstable as a surface low moved east-northeast across southern Iowa during the evening. The CAPE to the south of the low was around 3000 J/kg, with lifted indices around -6 C.
• Flash Flooding and Hail in Iowa, June 14 to 15, 2011$522,000 · 0.88 in hail · 6 eventsHeavy rain-producing showers and thunderstorms moved across parts of southeast Iowa, northeast Missouri, and western Illinois during the late evening of June 14 and early morning of June 15.
• Flash Flooding and Hail in Illinois, June 14 to 15, 2011$85,000 · 61 kt wind · 10 eventsLow pressure tracking from northern Missouri across north-central Illinois brought scattered thunderstorms to the area during the early morning hours of June 15th. The thunderstorms produced bands of heavy rainfall and flash flooding along the Illinois River valley.
• Flash Flooding in Illinois, June 14 to 15, 2011$100,000 · 3 eventsHeavy rain-producing showers and thunderstorms moved across parts of southeast Iowa, northeast Missouri, and western Illinois during the late evening of June 14 and early morning of June 15.
• Flooding in Utah, June 15 to 23, 2011$300,000 · 3 eventsAnother warm-up across the state of Utah and another round of heavy rainfall led to increases in river flows during the middle of June. Impacts included continued flooding on the lower portions of the Weber River and new flooding along the Sevier and Logan Rivers.
• Flooding in Iowa, June 15 to 30, 2011$165,000 · 2 eventsHeavy rainfall moved across northern Iowa and southern Minnesota. The rain resulted in rises along the upper reaches of the Des Moines River. With the rain falling in the headwaters area of the river, the flooding lasted through the rest of the month.
• Flooding in Idaho, June 15 to 30, 2011$20,000 · 2 eventsFollowing a very wet April and May, warmer June temperatures began to melt an above normal mountain snowpack increasing flows into already swollen river basins.
• Flooding in Illinois, June 15 to 16, 2011$250,000 · 2 eventsHeavy rains from June 13th to June 15th resulted in the La Moine River at Colmar going above the major flood stage level of 24 feet on June 16 around 1246 am CDT. It crested around 24.3 feet around 7 am CDT June 16.
• Flash Flooding in Nebraska, June 16 to 17, 20119 eventsStrong thunderstorms produced severe weather and heavy rain which led to flash flooding.
• Flash Flood and Hail in South Dakota, June 16, 2011$15,000 · 2.75 in hail · 7 eventsSevere thunderstorms developed across Bennett and Todd Counties, producing hail to the size of baseballs and 60 mph wind gusts. Heavy rainfall caused flloding on the Rosebud Reservation.
• Flash Flood and Hail in Tennessee, June 16 to 17, 20112.25 in hail · 18 eventsA mesoscale convective system developed over Northern Arkansas and moved along a stationary front draped across the Mid-South. There were several reports of large hail and damaging winds across West Tennessee during the late afternoon and early evening hours of June 16, 2011.
• Flash Flooding in Virginia, June 16 to 17, 20114 eventsA warm front slowly lifted northward through northern Virginia on the evening of the 16th. Warm and very moist air was lifted along this boundary and thunderstorms developed.
• Flash Flood and Hail in Kansas, June 17 to 19, 20111.25 in hail · 13 eventsA frontal boundary across the area and an upper level disturbance moving across the central Plains into the Ozarks caused a cluster of strong to severe storms to develop. Storms produced high winds and large hail across the area.
• Flash Flood and Hail in Missouri, June 17, 20111 in hail · 6 eventsElevated convection fired up across the region. There were several reports of large hail, damaging winds and flash flooding with these storms.
• Flash Flooding and Flooding in Montana, June 17 to 23, 20116 eventsTwo to three inches of rain fell across the already saturated soils to raise creek and stream levels. Much of this rain fell in southern Saskatchewan, therefore the tributaries from there had the worse flooding.
• Flash Flooding and Hail in Illinois, June 17 to 18, 2011$163 million · 52 kt wind · 11 eventsThunderstorms initiated along an old outflow boundary extending from Jacksonville to near Lawrenceville during the evening of June 17th.
• Flooding in West Virginia, June 18, 2011$20,000 · 3 eventsThunderstorms training along a stalled frontal boundary produced heavy rainfall and some flooding of roads.
• Flash Flooding and Damaging Winds in Illinois, June 17 to 18, 201161 kt wind · 11 eventsThunderstorm complex developed along a warm front over the forecast area. There were several reports of damaging winds and flash flooding with these storms.
• Flash Flooding and Flooding in Wisconsin, June 18 to 22, 2011$88,000 · 50 kt wind · 17 eventsScattered thunderstorms developed well north of a warm front, that was across southern Iowa, during the evening of the June 18th. These storms were slow moving and produced some localized heavy rain and flash flooding across Crawford and Vernon Counties.
• Flash Flooding and Flood in Minnesota, June 18 to 19, 2011$2,000 · 7 eventsScattered thunderstorms developed well north of a warm front, that was across southern Iowa, during the evening of the June 18th. These storms were slow moving and produced some localized heavy rain and flash flooding across Wabasha and Houston Counties.
• Flash Flood in West Virginia, June 18, 2011$150,000 · 1 eventThunderstorms training along a stalled frontal boundary produced heavy rainfall and flash flooding in Cameron, West Virginia.
• Flash Flooding and Flood in Missouri, June 18 to 19, 2011$30,000 · 3 in hail · 33 eventsSevere thunderstorms developed along a surface boundary, that was draped across west central Missouri, during the late evening hours of June 18th, into the early morning hours of June 19th, 2011. Hail, damaging winds, and flash flooding were observed.
• Flash Flooding and Flooding in Illinois, June 18 to 21, 20111 death · $850,000 · 6 eventsA persistent frontal boundary interacting with a very moist airmass led to periods of showers and thunderstorms across central Illinois on June 19th and 20th.
• Flood and Damaging Wind in Kentucky, June 19, 2011$1,000 · 50 kt wind · 4 eventsClusters of strong thunderstorms brought isolated tree damage and heavy rain to portions of eastern KY along the Tennessee border during the morning hours of June 19th.
• Flash Flood and Heavy Rain in North Dakota, June 19, 2011$100,000 · 3 eventsSlow moving heavy showers and thunderstorms resulted in flash flooding conditions over portions of north central North Dakota during the late afternoon and evening of June 19th. One funnel cloud report over far west central North Dakota was also received.
• Flash Flooding and Heavy Rain in Nebraska, June 19, 20116 eventsSevere thunderstorms produced hail and heavy rain rain which caused areas of flash flooding.
• Flash Flooding and Hail in Nebraska, June 19 to 20, 2011$139,000 · 2.75 in hail · 59 eventsA strong upper level disturbance interacted with a moist and unstable atmosphere to produce an outbreak of severe thunderstorms across western and north central Nebraska during the evening and early morning hours on June 19th, 2011.
• Flash Flooding and Flooding in Ohio, June 19 to 20, 2011$1.5 million · 0.75 in hail · 7 eventsA stalled frontal boundary was the focus for showers and thunderstorms to develop and train across portions of eastern Ohio, the northern West Virginia panhandle, and western Pennsylvania producing flash flooding and flooding.
• Flash Flooding and Flooding in Kentucky, June 19 to 20, 20111 death · $5.3 million · 65 kt wind · 46 eventsDuring the overnight and early morning hours of Monday, June 20th, numerous strong to severe thunderstorms wreaked havoc on portions of eastern KY. Between 2 and 5 am EDT, numerous trees were blown across Laurel, Bell, Knox, and Whitley counties.
• Flash Flood in West Virginia, June 19, 2011$15,000 · 1 eventStrong mid level dynamics overcame low buoyancy to reform showers in southern Ohio during the late afternoon. The showers were efficient rain producers as they moved east into West Virginia.
• Flood and Hail in Nebraska, June 19 to 21, 2011$5,000 · 2.5 in hail · 16 eventsSupercell Thunderstorms developed in a short line from southeast Nebraska into southwest Iowa during the late evening of June 19th.
• Flash Flood and Flooding in Pennsylvania, June 19 to 20, 2011$270,000 · 6 eventsA stalled frontal boundary was the focus for showers and thunderstorms to develop and train across portions of eastern Ohio, the northern West Virginia panhandle, and western Pennsylvania producing flash flooding and flooding.
• Flash Flood and Hail in Iowa, June 19 to 20, 2011$105,000 · 1.75 in hail · 4 eventsDuring the early morning hours of June 20 a low pressure system located over central Kansas with a front extending into Iowa produced heavy rain-producing showers and thunderstorms across southeast Iowa, northeast Missouri, and west central Illinois.
• Flash Flooding and Hail in Missouri, June 19 to 20, 2011$30,000 · 1.75 in hail · 3 eventsDuring the early morning hours of June 20 a low pressure system located over central Kansas with a front extending into Iowa produced heavy rain-producing showers and thunderstorms across southeast Iowa, northeast Missouri, and west central Illinois.
• Flash Flooding and Flooding in Indiana, June 20, 2011$39,000 · 1.75 in hail · 25 eventsA line of thunderstorms developed along a warm front moving northeast through central Indiana during the early morning hours of June the 20th. The initial severe impacts came in the form of large hail, but transitioned to a wind damage threat as the morning wore on.
• Flash Flooding and Damaging Winds in Tennessee, June 20, 20111 death · $219,000 · 60 kt wind · 10 eventsA thunderstorm complex tracked across east Tennessee during the morning hours. Storm reports contained damaging thunderstorm wind along with flash flooding. One person drowned in Claiborne County.
• Flash Flooding and Heavy Rain in North Dakota, June 20, 2011$60,000 · 3 eventsContinued redevelopment of thunderstorms over north central Stutsman County and central Foster County resulted in flash flooding. A measured heavy rain report of 4.22 inches was received from south central Foster County.
• Flooding in Iowa, June 20 to 30, 2011$240,000 · 6 eventsHeavy rainfall across northern Iowa and southern Minnesota sent a wave of flood water south along the Des Moines River The upper reaches flooded earlier in the month with the water reaching farther south after mid month.
• Flood in Missouri, June 20 to 23, 2011$500,000 · 1 eventHeavy rains during the second week of June caused the Fox River to flood Alexandria, MO during the third week of June. Much of the town was under flood waters.
• Flash Flooding in Kentucky, June 20, 2011$39,000 · 4 eventsThunderstorms developed along a warm front in an increasingly unstable airmass. This instability, combined with precipitable water values near two inches, produced thunderstorms that caused flash flooding in northern Kentucky.
• Flash Flooding in South Dakota, June 20 to 21, 20112 deaths · 5 eventsA large upper level low pressure area along with deep moisture brought very heavy rains to central South Dakota. Rainfall amounts of 3 to 7 inches occurred across parts of the area resulting in flash flooding.
• Flooding in South Dakota, June 20 to 22, 201115 eventsA large upper level low pressure area along with deep moisture brought very heavy rains to central, north central, and northeast South Dakota. Rainfall amounts of 3 to 7 inches occurred across much of the area resulting in widespread flooding.
• Flood and Hail in Kansas, June 20, 2011$400,000 · 1.75 in hail · 98 eventsA Squall Line developed along the Interstate 135 corridor around 3 pm on the 20th and moved east through the evening into Southeast Kansas. The storms were pretty potent as they produced widespread hail and damaging winds across the eastern one half of the state.
• Flash Flooding and Flooding in Nebraska, June 20, 2011$21,000 · 1 in hail · 14 eventsThunderstorms containing very heavy rainfall occurred across portions of southwest Nebraska causing flash flooding over portions of western Lincoln and eastern Keith county during the evening hours on June 20th, 2011.
• Flash Flooding and Damaging Winds in South Dakota, June 20, 2011$20,000 · 61 kt wind · 8 eventsThunderstorms produced flash flooding and damaging winds at several locations in southeast South Dakota during the evening of June 20th. The thunderstorms affected the area from the Missouri River to Interstate 90.
• Flash Flood and Damaging Wind in Louisiana, June 21, 201153 kt wind · 5 eventsSevere thunderstorms developed in the morning, and again in the |afternoon, on Tuesday, 21 June 2011. The thunderstorms formed after |several days of record setting hot weather, which was the result of a |persistent ridge of high pressure in the middle and upper atmosphere.
• Flash Flooding and Hail in Virginia, June 21, 2011$323,000 · 1.75 in hail · 53 eventsDuring the afternoon of the 21st, a thunderstorm complex headed south through eastern Kentucky. Convection along the eastern edge of this system helped to prompt additional development farther east.
• Flash Flooding and Hail in Illinois, June 21 to 22, 20111 in hail · 24 eventsA strong cold front was moving through the region, triggering showers and thunderstorms. There were numerous reports of large hail and damaging winds.
• Flash Flooding and Flooding in Ohio, June 21, 2011$87,000 · 1 in hail · 32 eventsAn approaching shortwave trough combined with ample instability in a warm and moist air mass across Ohio and Northern Kentucky during the afternoon.
• Flash Flood and Hail in Illinois, June 21, 20112 injured · $250,000 · 78 kt wind · 7 eventsNumerous thunderstorms moved across southern Illinois in a very moist and moderately unstable air mass.
• Flash Flooding and Flooding in Michigan, June 21 to 22, 20114 injured · $1.5 million · 2 in hail · 22 eventsA warm front moved north across southern and central lower Michigan during the day of June 21st, allowing a much warmer and very humid airmass to advect into the area.
• Flash Flooding and Damaging Winds in Illinois, June 21 to 22, 2011$698,000 · 61 kt wind · 39 eventsSevere thunderstorms developed along an advancing cold front during the late afternoon and evening of June 21st. Wind gusts of 60 to 70 mph brought numerous trees and power lines down across much of the area.
• Flash Flooding and Hail in North Carolina, June 21 to 22, 20111.75 in hail · 26 eventsStrong to severe thunderstorms developed along the northern periphery of the strong upper level ridge as strong daytime heating resulted in moderate instability across the area.
• Flash Flood and Hail in West Virginia, June 21, 2011$86,000 · 1 in hail · 9 eventsDuring the afternoon of the 21st, a thunderstorm complex headed south through eastern Kentucky. Convection along the eastern edge of this system helped to prompt additional development farther east.
• Flash Flooding and Hail in Michigan, June 21 to 22, 2011$28,000 · 70 kt wind · 21 eventsA batch of thunderstorms moving through during the evening hours produced scatter wind damage across southeast Michigan, along with flash flooding over Saginaw Bay and St. Clair counties where over 3 inches of rain fell in a short period.
• Flash Flood in Michigan, June 21 to 22, 2011$18,000 · 1 eventBands of training thunderstorms affected parts of Northwest and North Central Lower Michigan. Locally very heavy rain occurred in a few spots, including between Manistee and Cadillac. The only flooding occurred in the Cross Village area of Emmet County.
• Flooding in California, June 22 to 25, 2011$77,000 · 4 eventsJune was certainly a month of extremes that produced near record heat in the San Joaquin Valley, many days of unseasonably cool weather, and even a day of record shattering rainfall.
• Heavy Rain in New York, June 22, 20111 death · 1 eventThunderstorms moving across the area produced heavy rainfall, which resulted in poor visibility and led to a fatal motor vehicle accident.
• Flash Flooding in North Dakota, June 22, 2011$6.0 million · 2 eventsRunoff from very heavy rain resulted in a rapid four foot rise along the Souris River near Sherwood. A mandatory evacuation was ordered for Mouse River Park located in McKinney Township. One hundred homes, 150 camping sites, and several businesses and buildings were impacted.
• Flood and Hail in Michigan, June 22 to 23, 20111 injured · $129,000 · 1.75 in hail · 38 eventsA very moist unstable airmass was in place across southeast Michigan as a warm front had passed through the area the previous night. Storms developed out to the west along a cold front and moved through the area as an organized line of storms during the afternoon hours.
• Flash Flood and Damaging Wind in Texas, June 22 to 23, 2011$40,000 · 57 kt wind · 7 eventsAn upper level disturbance, sandwiched between a receding upper level ridge across the southwest U.S. and another ridge across Florida and the eastern Gulf of Mexico, drew deep tropical moisture northward from the Bay of Campeche and points south.
• Flooding in Utah, June 23 to 30, 2011$470,000 · 5 eventsUnseasonably warm temperatures were observed again at the end of June, leading to even more river flooding across Utah. Waterways that flooded significantly during this time period included Little Cottonwood Creek, the Duchesne River, and Spring Creek in Providence, Utah.
• Flooding in Illinois, June 23 to 30, 2011$70,000 · 6 eventsAn upper level high that was over the region during early June retrograded west during the middle of the month. This allowed for disturbances in the northwest flow aloft to bring multiple rounds of precipitation.
• Flash Flooding and Damaging Wind in New York, June 23, 2011$111,000 · 50 kt wind · 3 eventsShowers and thunderstorms will heavy rainfall developed across parts of central New York. Some of the storms occurred in areas that had already received heavy rainfall the previous day.
• Flash Flooding and Flood in New Jersey, June 23, 20116 eventsWaves of low pressure riding along a nearly stationary frontal boundary across the local area caused several rounds of thunderstorms, which resulted in flash flooding throughout Northeast New Jersey.
• Flash Flooding in New York, June 23, 20118 eventsWaves of low pressure riding along a nearly stationary frontal boundary across the local area caused several rounds of thunderstorms, which resulted in flash flooding in portions of The Lower Hudson Valley and Long Island.
• Flash Flooding in Connecticut, June 23, 20114 eventsWaves of low pressure riding along a nearly stationary frontal boundary across the local area caused several rounds of thunderstorms, which resulted in flash flooding in portions of Southern Connecticut.
• Flooding in Wyoming, June 24 to 25, 2011$755,000 · 3 eventsThe first extended warm spell of the season produced an active period of snowmelt from an historic snowpack in the western Bighorn Mountains. As a result, waterways in and near the foothills of the Bighorn Mountains rose rapidly causing flooding in Big Horn and Washakie counties.
• Flood in Wyoming, June 24 to 30, 2011$665,000 · 1 eventThe first extended warm spell of the summer provided an active period of snowmelt in the Wind River Basin. A cool, wet spring and early summer had kept snowpack in the surrounding mountains unseasonably high.
• Flooding in California, June 24 to 30, 2011$32,000 · 4 eventsMuch above average snowpack in the Sierra combined with warm to very warm temperatures to cause small stream flooding in Mono County late in June.
• Flash Flooding and Hail in Alabama, June 24 to 28, 2011$104,000 · 1.75 in hail · 42 eventsA warm and unstable air mass, along with a front stalled out just to Alabama's north, led to several days of isolated to scattered showers and thunderstorms. Some of the storms produced large hail, damaging winds, and locally heavy rainfall.
• Flash Flooding and Heavy Rain in North Dakota, June 24, 2011$95,000 · 3 eventsFlash flood conditions developed over portions of northwest North Dakota as slow moving and redeveloping thunderstorms moved over Burke County. Local law enforcement reported water flowing over roads southwest of Lignite.
• Flash Flooding in New York, June 24, 20114 eventsSeveral rounds of slow moving thunderstorms producing very heavy rainfall moved across southern Herkimer County Friday evening, June 24th, as an occluded frontal boundary moved eastward across the region.
• Flash Flooding and Damaging Winds in South Dakota, June 24 to 25, 2011$21,000 · 65 kt wind · 11 eventsA line of severe thunderstorms moved across northwestern South Dakota, producing wind gusts to 70 mph from Harding and Butte Counties, southeastward into central South Dakota.
• Flood in Wyoming, June 24 to 29, 2011$160,000 · 1 eventThe high waters at the confluence of the Lamar River and Soda Butte Creek combined to undercut and damage a 200-foot-section of Yellowstone National Park's Northeast Entrance road.
• Flash Flood and Hail in Tennessee, June 25 to 26, 2011$3,000 · 1 in hail · 7 eventsA stationary front was located across the Mid-South on June 24th, 2011. The front slowly began lifting northward during the period of June 25th-June 26th, 2011. Round after round of shower and thunderstorm activity developed along and ahead of the front.
• Flash Flood in North Dakota, June 25, 2011$300,000 · 1 eventRunoff from very heavy rain resulted in levee overtopping and failure and flash flooding along the Souris River near Sawyer. A mandatory evacuation was ordered in this part of Ward County.
• Flash Flooding in Iowa, June 25, 2011$90,000 · 5 eventsA strong push of moisture took place during the overnight hours of the 24th into the morning of the 25th. The low level jet increased to 60 kts, bringing a return of moisture to the area. Precipitable water values increased to just under 2 inches by morning.
• Flooding in Indiana, June 25 to 30, 2011$120,000 · 4 eventsAn upper level high that was over the region during early June retrograded west during the middle of the month. This allowed for disturbances in the northwest flow aloft to bring multiple rounds of precipitation.
• Flooding in Iowa, June 25 to 30, 2011$245,000 · 8 eventsWater continued to flow at above normal levels through the Des Moines River system. In addition, another round of heavy rainfall moved through Iowa, especially the water soaked southern half. Flooding took place on several streams across the south.
• Flash Flooding and Hail in North Dakota, June 25, 2011$340,000 · 1.75 in hail · 33 eventsA surface cold front advecting from west to east, coupled with a mid level jet streak, combined with abundant moisture and instability to result in widespread thunderstorm activity during the afternoon and evening hours of June 25th.
• Flash Flooding and Hail in Missouri, June 25 to 26, 20111.75 in hail · 22 eventsA warm front across the region was the focus of thunderstorm development. A mesoscale convective system developed during the evening of June 25th and moved east across the region. There were numerous reports of large hail, damaging winds and flash flooding.
• Flash Flooding and Hail in Illinois, June 25 to 26, 20112 in hail · 10 eventsA warm front across the region was the focus of thunderstorm development. A mesoscale convective system developed during the evening of June 25th and moved east across the region. There were numerous reports of large hail, damaging winds and flash flooding.
• Flash Flood and Hail in North Dakota, June 25 to 26, 20111.5 in hail · 10 eventsLate afternoon temperatures across the Devils Lake region on the 25th topped out in the mid to upper 70s with dew points in the low to mid 60s.
• Flash Flooding and Flooding in Illinois, June 25 to 26, 2011$95,000 · 1 in hail · 23 eventsClusters of thunderstorms developed along an advancing warm front during the evening of June 25th.
• Flood in Wyoming, June 25 to 26, 2011$167,000 · 1 eventThe warmest temperatures of the season led to increased snowmelt along the west side of the Salt River Range. The water flowed fast and high enough to cause flooding in Star Valley Ranch.
• Flash Flooding in Indiana, June 26, 2011$19,000 · 3 eventsComing soon.
• Flash Flood and Heavy Rain in Kentucky, June 26, 2011$120,000 · 3 eventsNumerous thunderstorms with torrential rain caused local flooding. The storms were supported by a warm front that extended east-northeast from the southern Plains across the Lower Ohio Valley.
• Flash Flood in North Dakota, June 26, 2011$45,000 · 1 eventFour separate rain events on June 26th, with officially 2.32 inches of rain, resulted in flash flood conditions over eastern Stutsman County including the city of Jamestown.
• Flood and Hail in Nebraska, June 26 to 27, 2011$2,000 · 2 in hail · 49 eventsAn upper level disturbance that lifted across the Rockies and into the Dakotas sent a cold front across eastern Nebraska and southwest Iowa during the late evening and overnight hours of June 26th and 27th.
• Flash Flooding and Damaging Winds in Iowa, June 26, 2011$60,000 · 65 kt wind · 22 eventsThunderstorms produced damaging winds and flash flooding over much of northwest Iowa during the evening of June 26th.
• Flash Flood and Flood in Iowa, June 26 to 27, 2011$335,000 · 1 in hail · 15 eventsA strong disturbance moved through central Iowa during the late afternoon and evening of June 26 brought showers and severe thunderstorms to portions of central and eastern Iowa. Widespread tree damage occurred across Van Buren County.
• Flash Flooding and Hail in Missouri, June 26 to 27, 2011$25,000 · 61 kt wind · 4 eventsA strong disturbance moved through central Iowa during the late afternoon and evening of June 26 brought showers and severe thunderstorms to portions of central and eastern Iowa. Widespread tree damage occurred across Van Buren County.
• Flash Flood and Hail in Illinois, June 26 to 27, 2011$785,000 · 1 in hail · 17 eventsA strong disturbance moved through central Iowa during the late afternoon and evening of June 26 brought showers and severe thunderstorms to portions of central and eastern Iowa. Widespread tree damage occurred across Van Buren County.
• Flash Flooding and Hail in Illinois, June 26 to 27, 2011$380,000 · 1.75 in hail · 23 eventsLow pressure tracking along a nearly stationary frontal boundary draped across central Illinois triggered several rounds of thunderstorms during the late evening of June 26th into the early morning of June 27th.
• Flood and Hail in Kansas, June 26 to 27, 20111.25 in hail · 13 eventsOn June 27, 2011 severe storms moved through portions of northeast Kansas bringing heavy rain and marginally severe hail.
• Flash Flooding and Damaging Winds in Minnesota, June 27, 201150 kt wind · 17 eventsLow pressure over central Minnesota brought tropical moisture into northeast Minnesota. A cold front, over Saskatchewan that morning, triggered slow moving thunderstorms with heavy rain.. Rainfall of 2 to 4 inches overnight and through the day was common.
• Debris Flows in Puerto Rico, June 27, 20114 eventsAn active tropical wave combined with an upper level trough and daytime heating to produce squally weather across Puerto Rico.
• Flash Flooding and Flood in Kentucky, June 27 to 28, 2011$5,000 · 52 kt wind · 8 eventsStrong storms containing very heavy rain and isolated damaging winds moved southeast across several counties in south central Kentucky during the early morning hours on June 28th. Several of these storms trained over the same locations, causing localized flash flooding.
• Flood and Damaging Winds in Tennessee, June 28, 2011$70,000 · 52 kt wind · 19 eventsA Mesoscale Convective System moved across Middle Tennessee during the early morning hours on June 28 causing widespread wind damage. Another MCS spread across western and southern portions of Middle Tennessee later in the morning with more wind damage and heavy rainfall.
• Flash Flooding and Hail in Alabama, June 28, 2011$22,000 · 1 in hail · 29 eventsA quasi-linear convective system dropped south from Tennessee into northern Alabama just after sunrise. The storms dumped very heavy rainfall in far northwest Alabama as a secondary system moved east and merged with the southward moving system.
• Flash Flooding and Damaging Winds in Mississippi, June 28, 201150 kt wind · 5 eventsAn early morning mesoscale convective system moved from Southern Missouri into Northeast Arkansas on June 16th. The system eventually swept across the entire Mid South by Noon. There were numerous reports of damaging wind and isolated reports of flash flooding.
• Flash Flood and Hail in West Virginia, June 28, 2011$500,000 · 1 in hail · 2 eventsA cold front swept through the region on the 28th. Multiple clusters of storms accompanied the front as it progressed. One of these storms increased to severe levels over southeast West Virginia and produced large hail.
• Flash Flooding and Damaging Winds in North Carolina, June 28, 201150 kt wind · 17 eventsIntense heating coupled with a moist air mass to support strong to severe convection.|The strongest storms were focused along a pre-frontal trough and in advance of an upper level disturbance.
• Flash Flood and Hail in North Carolina, June 28, 2011$64,000 · 1 in hail · 5 eventsA cold front swept through the region on the 28th. Multiple clusters of storms accompanied the front as it progressed. Some of these storms increased to severe levels and produced large hail and damaging winds. Flash flooding also occurred with one of the storms.
• Flooding in Wyoming, June 28 to 30, 2011$570,000 · 4 eventsThe warmest temperatures of the summer season produced snowmelt runoff in the drainages of the western Bighorn Mountains. Creeks and streams in Big Horn and Washakie counties quickly rose in response to the increased runoff. The flooding subsided during the morning of July 1.
• Flood and Hail in North Carolina, June 29, 20110.88 in hail · 3 eventsA weak cold front was centered across eastern North Carolina during the morning hours of June 29th, 2011. Back-building storms developed along a boundary near the coast with reports of heavy rain, minor flooding, and small hail.
• Flooding and Hail in North Carolina, June 29, 2011$16,000 · 1.75 in hail · 15 eventsPulse severe thunderstorms quickly developed along the seabreeze during the late afternoon.
• Flash Flooding in Georgia, June 29, 20119 eventsStrong surface heating along with precipitable water values around 2 inches and a weak wind field favored the development of slow moving thunderstorms with heavy rain over Southeast Georgia.
• Flash Flood and Hail in Colorado, June 30, 2011$9,000 · 1 in hail · 14 eventsA vigorous Pacific trough moved across the region and produced strong thunderstorms and areas of heavy rainfall across western Colorado.
• Debris Flow in Colorado, June 30, 20111 death · 1 eventA thunderstorm and accompanying heavy rain causes a small landslide that killed a hiker near the summit of Mt. Princeton.
• Flooding in Indiana, July 1 to 2, 20114 eventsThe White and Wabash Rivers, which had risen above flood stage in late June, fell back in early July. Heavy rainfall across southern Illinois and Indiana during the last week of June sent the rivers above flood stage for a week or so.
• Flooding in Iowa, July 1 to 31, 2011$3.2 million · 5 eventsA record rain event in May in eastern Montana combined with other storms in April and May plus early spring snow melt and brought record high water to the Missouri River chain of reservoirs.
• Flooding in Nebraska, July 1 to 31, 2011$1.3 million · 11 eventsA record rain event in May in eastern Montana, other storms in April and May, and snow melt all combined to bring record high water to the Missouri River chain of reservoirs.
• Flooding in North Dakota, July 1 to 31, 2011$610,000 · 3 eventsThe month of July was fairly active weather-wise, but overall precipitation amounts were not impressive. Therefore the level of Devils Lake dropped slightly during the course of the month, from about 1454.30 feet MSL to about 1454.20 feet MSL.
• Flooding in Iowa, July 1 to 31, 2011$330,000 · 5 eventsRiver levels remained high along the Des Moines River system from the rains that fell during June. Additional rainfall during the month of July helped to maintain high river levels.
• Flooding in South Dakota, July 1 to 31, 20117 eventsMajor to record Missouri River flooding continued in July with the flooding continuing to have major impacts. Populated areas evacuated before the month remained evacuated, with a few additional evacuations made.
• Flooding in Illinois, July 1 to 19, 20117 eventsSeveral rivers that had risen above flood stage in late June fell back in early to mid July. Floodwaters from the Missouri River finally made it down the Mississippi River, resulting in crests with minor to moderate flooding early in the month.
• Flooding in North Dakota, July 1 to 31, 20116 eventsThis was part of historic flooding in North Dakota with statewide costs estimated around 1.5 billion dollars. Flooding was the result of significant winter snows and significant spring rains, not only in North Dakota but in Montana as well.
• Flooding in South Dakota, July 1 to 31, 20116 eventsModerate to major flooding on the James River continued through the month, with the river varying according to the uneven areas of heavy rainfall. Peak stages were generally a little above the peak stages of June. Farmland and several roads near the river remained flooded.
• Flooding in Arkansas, July 1 to 5, 2011$12,000 · 2 eventsAreal flooding in White and Woodruff Counties, which had occurred throughout May and June, finally came to an end when the White River receded in early July.
• Flooding in North Dakota, July 1 to 31, 20114 eventsThis was part of historic flooding in North Dakota with statewide costs estimated around 1.5 billion dollars. Flooding was the result of significant winter snows and significant spring rains, not only in North Dakota but in Montana as well.
• Flooding in North Dakota, July 1 to 31, 20114 eventsThis was part of historic flooding in North Dakota with statewide costs estimated around 1.5 billion dollars. Flooding was the result of significant winter snows and significant spring rains, not only in North Dakota but in Saskatchewan, Canada, as well.
• Flood in Wyoming, July 1 to 11, 2011$600,000 · 1 eventWater levels continued to rise on the Wind River into early July in response to rapid late-season snowmelt and increased releases from a reservoir. The flood waters reached record levels at Kinnear and Riverton and came very close at Dubois and Crowheart.
• Flood in Montana, July 1 to 11, 2011$600,000 · 1 eventAlthough no significant synoptic spring system moved across the Billings forecast area, warm late June and early July temperatures resulted in rapid mountain snow melt runoff and flooding.
• Flooding in Utah, July 1 to 15, 2011$190,000 · 5 eventsA few rivers across Utah continued to flood into the month of July, before finally receding in mid-July. The major rivers that continued to flood included the Logan River and the Duchesne River. Note that this episode began in June.
• Flood in Wyoming, July 1 to 2, 2011$65,000 · 1 eventFlood waters along the Greybull River subsided on July 1 and 2 as snowmelt decreased and a ridge of high pressure prevented additional thunderstorm development. More information regarding the onset of this flood episode can be found in the June 2011 Storm Data publication.
• Flood in Utah, July 1 to 13, 2011$50,000 · 1 eventHigh flows along area rivers and streams continued through the first part of July as the record snow pack continued to melt across the higher terrain of Northeast Utah.
• Flooding in Montana, July 1, 20114 eventsFalling river levels on the Missouri occurred on the stretch from the Fort Peck dam eastward that ended on July 1.
• Flooding in Washington, July 1 to 8, 2011$20,000 · 3 eventsFollowing a very wet April and May, warmer June temperatures began to melt an above normal mountain snowpack increasing flows into already swollen river basins. This caused moderate flooding along the Pend Oreille River and several of its tributaries.
• Flood in Idaho, July 1 to 8, 2011$20,000 · 1 eventFollowing a very wet April and May, warmer June temperatures began to melt an above normal mountain snowpack increasing flows into already swollen river basins.
• Flooding and Hail in Indiana, July 1, 20112 injured · 1.75 in hail · 8 eventsOn the morning of July 1st, a series of thunderstorms moved south off of Lake Michigan dropping heavy rain and large hail across portions of northwest Indiana.
• Flooding in Wyoming, July 1 to 7, 2011$125,000 · 3 eventsRapid melt of a strong late season snowpack resulted in high water levels along many rivers and streams in Sublette County. Certain sections of the Green and New Fork rivers flooded lowlands and in some cases necessitated the sandbagging of homes.
• Flash Flooding and Hail in South Dakota, July 1, 2011$635,000 · 2.5 in hail · 20 eventsThunderstorms produced large hail and damaging winds across part of southeast South Dakota near and north of Interstate 90 during the afternoon of July 1st. Most of the damage from the severe weather and flash flooding was in Lake, Brookings, and Moody Counties.
• Flash Flood and Damaging Winds in U.S. Virgin Islands, July 1 to 4, 2011$300 · 4 eventsThe leading edge of a strong tropical wave moved across the U.S. Virgin Islands generating strong gusty winds and periods of heavy rain.
• Flash Flood and Damaging Wind in Puerto Rico, July 1 to 4, 2011$10,000 · 5 eventsAn active tropical wave brought strong gusty winds and very heavy rain mainly to the eastern half of Puerto Rico.

Every billion-dollar disasterEvery storm of 2011Tornadoes in 2011

NOAA NCEI, U.S. Billion-Dollar Weather and Climate Disasters (2025), https://doi.org/10.25921/stkw-7w73, and the Storm Events Database for the episodes.