Midwest/Southeast Tornadoes

Losses, 2024 dollars

$13 billion

Losses at the time

$9.1 billion

Deaths

177

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.

• Flash Flood in Nebraska, May 20, 2011$1,000 · 1 eventThunderstorms repeatedly tracked across Boone county, especially west of Albion, for several hours during the evening of 5/20. This produced isolated flash flooding across a few roads in the Cedar Rapids and Primrose area.
• Damaging Wind in Alaska, May 20, 2011$5,000 · 1 eventGusty winds peaked at 49 mph. Thunderstorm was nearby. Two roofs were damaged. A number of small trees were blown down.
• Tornado in Montana, May 20, 2011$75,000 · EF1 · 1 eventA small EF-1 tornado occurred 8 miles south of Terry, MT. The NWS Glasgow office did a damage survey.
• Damaging Wind in Louisiana, May 21, 201150 kt wind · 1 eventOne thunderstorm that developed near West Carroll Parish was able to produce damaging winds.
• Hail in Texas, May 21, 20111 in hail · 1 eventScattered thunderstorms once again developed across the region on May 21st. The atmosphere was unchanged from that of May 20th, which was a very unstable airmass with moderate shear present in the mid and lower levels of the atmosphere.
• 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.
• Hail in Louisiana, May 21, 20110.75 in hail · 1 eventScattered thunderstorms once again developed across the region on May 21st. The atmosphere was unchanged from that of May 20th, which was a very unstable airmass with moderate shear present in the mid and lower levels of the atmosphere.
• 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.
• Tornado and Flash Flood in Texas, May 21 to 22, 2011$126,000 · EF0 · 25 eventsSeveral supercell thunderstorms developed along a dryline in the southwestern portions of the Fort Worth County Warning Area. Locations in Mills, Hamilton, Coryell, and Lampasas County were primarily affected.
• Tornado and Hail in Minnesota, May 21 to 22, 2011$25,000 · EF0 · 45 eventsSeveral waves of thunderstorms moved across the northern and western sides of the Twin Cities. Several rounds of hail fell during the afternoon and evening hours of Saturday May 21st. A brief tornado touched down in Medina during the height of the storm.
• Hail and Damaging Wind in New York, May 21, 2011$1,000 · 50 kt wind · 5 eventsAn upper level low pressure system continued to produce scattered showers and thunderstorms across parts of central New York as it moved east and away from the area. A few storms produced hail and damaging wind gusts.
• Damaging Winds in Tennessee, May 21, 2011$92,000 · 55 kt wind · 8 eventsSevere thunderstorms occurred across three Midlle Tennessee counties during the late afternoon hours on Saturday, May 21st. As a result, thunderstorm wind damage events occurred in these counties.
• Hail in Nebraska, May 21, 2011$2.1 million · 3 in hail · 9 eventsContinuing an active few days of strong to severe thunderstorms and localized flooding, this Saturday afternoon and early evening featured a few fairly isolated severe storms across northeast portions of South Central Nebraska. Large hail was the main story with these storms.
• Tornadoes and Hail in Kansas, May 21, 20111 death · 6 injured · $2.3 million · EF3 · 102 eventsSupercell thunderstorms developed in advance of a cold front and dryline during the late afternoon of Saturday May 21st. Several of the supercell thunderstorms produced tornadoes including at least 2 brief touchdowns in Topeka.
• Hail in Nebraska, May 21, 20111 in hail · 1 eventIsolated severe thunderstorm moved northeast at 35 mph across Wheeler County. The storm produced pea size to quarter size hail as it moved northeast.
• Hail in South Dakota, May 21, 20111 in hail · 6 eventsPenny to quarter size hail occurred across parts of northeast South Dakota.
• Hail in Kansas, May 21, 2011$600,000 · 1.75 in hail · 6 eventsContinuing an active few days of strong to severe thunderstorms and localized flooding, this Saturday afternoon and early evening featured essentially just one isolated severe thunderstorm across portions of North Central Kansas.
• Hail and Damaging Winds in South Dakota, May 21, 2011$6,000 · 56 kt wind · 6 eventsThunderstorms produced large hail and damaging winds at several locations in southeast South Dakota during the late afternoon and early evening of May 21st. The area affected extended from the Tyndall area just north of the Missouri River northeast to the Sioux Falls area.
• Hail and Damaging Winds in Iowa, May 21, 2011$91,000 · 2.75 in hail · 15 eventsAn upper level low was lifting northeast out of the southwest U.S. during the day on the 21st and was over the central High Plains by the evening hours.
• Hail in Minnesota, May 21, 20111 in hail · 1 eventA severe thunderstorm brought quarter size hail to Wheaton in the early evening hours.
• Tornado and Hail in Kansas, May 21, 2011EF0 · 12 eventsAn upper level disturbance over northern Kansas, lifted into Nebraska, during the afternoon and evening hours of May 21, 2011. This disturbance, combined with moisture convergence and diurnal heating, allowed thunderstorms to develop.
• Tornadoes and Hail in Oklahoma, May 21, 2011$8,000 · EF1 · 9 eventsSupercell storms developed from Lincoln county, south into Murray county. The largest and most severe storm moved over Pontotoc county, with several reports of tornadoes. The tornadoes were generally brief, but some damage did occur west of Ada.
• Tornado and Hail in Missouri, May 21, 2011$8,000 · EF0 · 31 eventsAn upper level disturbance over northern Kansas, lifted into Nebraska, during the afternoon and evening hours of May 21, 2011. This disturbance, combined with moisture convergence and diurnal heating, allowed thunderstorms to develop.
• Hail in Iowa, May 21, 20111.75 in hail · 6 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.
• Hail in Arkansas, May 21, 20110.88 in hail · 1 eventScattered thunderstorms once again developed across the region on May 21st. The atmosphere was unchanged from that of May 20th, which was a very unstable airmass with moderate shear present in the mid and lower levels of the atmosphere.
• Hail in Nebraska, May 21, 20111.75 in hail · 2 eventsThunderstorms produced large hail in the Newcastle area in Dixon County during the early evening of May 21st.
• Hail in Kansas, May 21, 20111 in hail · 2 eventsA persistent upper level disturbance sparked a few strong to severe thunderstorms over Chase county during the evening of the 21st. Hail up to the size of quarters was reported.
• Hail and Damaging Winds in Iowa, May 21, 201156 kt wind · 3 eventsThunderstorms produced damaging winds and hail in Plymouth and Sioux Counties of northwest Iowa during the early evening of May 21st.
• Hail in North Dakota, May 21, 20110.75 in hail · 1 eventEarly evening thunderstorms developed across portions of south central and southeastern North Dakota on May 21st. One report of large hail was received in LaMoure County.
• Hail and Damaging Wind in Minnesota, May 21, 20111.5 in hail · 9 eventsThunderstorms produced large hail and damaging winds at several locations across southwest Minnesota during the evening of May 21st.
• Hail in Oklahoma, May 21, 20111 in hail · 1 eventAn isolated severe thunderstorm developed ahead of the dry line over northeastern Oklahoma.
• Hail and Heavy Rain in North Dakota, May 21, 20111 in hail · 2 eventsA vertically stacked low pressure system tracked into western North Dakota. Meanwhile, at the surface, an occluded front curved out to the east and south from near Minot to Fargo (ND) to Morris (MN).
• Hail in Minnesota, May 21, 20111 in hail · 2 eventsA vertically stacked low pressure system tracked into western North Dakota. Meanwhile, at the surface, an occluded front curved out to the east and south from near Minot to Fargo (ND) to Morris (MN).
• Hail in Minnesota, May 22, 20110.88 in hail · 1 eventScattered thunderstorms developed across central Minnesota as a warm front advanced north during the overnight hours. A few of the storms produced some hail, mostly below severe levels.
• Hail in Arkansas, May 22, 20110.88 in hail · 1 eventA broad upper level trough over the center of the country combined with strong low level southerly flow over the Lower Misssissippi Valley helped to kick off showers and thunderstorms across the Mid-South during the morning hours of May 22nd.
• Tornadoes and Hail in Minnesota, May 22, 20111 death · 48 injured · $167 million · EF1 · 15 eventsDuring the early afternoon of Sunday May 22nd, a line of thunderstorms developed across south central Minnesota, and quickly moved north and northeast across east-central Minnesota, and into west-central Wisconsin.
• Hail and Damaging Wind in Indiana, May 22, 2011$2,000 · 3 in hail · 19 eventsDuring the afternoon and early evening of May the 22nd, storms dropped hail up to 3 inches in diameter over mainly the southern half of central Indiana.
• Hail and Damaging Winds in Tennessee, May 22, 2011$2,000 · 1 in hail · 6 eventsThunderstorms erupted rapidly just after the noon hour in northwest Alabama along an outflow boundary that propagated eastward from earlier thunderstorm activity in the mid South. A few of the storms moved across southern middle Tennessee.
• Hail and Damaging Winds in Alabama, May 22, 2011$6,000 · 1 in hail · 3 eventsThunderstorms erupted rapidly just after the noon hour in northwest Alabama along an outflow boundary that propagated eastward from earlier thunderstorm activity in the mid South.
• Tornadoes and Hail in Wisconsin, May 22, 20113 injured · $21 million · EF2 · 26 eventsDuring the afternoon of May 22nd, severe thunderstorms developed along a cold front as it moved through western Wisconsin. These severe thunderstorms produced three confirmed tornadoes, two of which were rated as EF2 with the other being an EF1.
• Hail and Damaging Winds in Michigan, May 22, 2011$44,000 · 2 in hail · 10 eventsNumerous strong to severe thunderstorms developed, producing large hail and damaging winds in spots.
• Hail and Damaging Winds in Illinois, May 22, 2011$19,000 · 1.75 in hail · 38 eventsA strong cold front interacting with a highly unstable airmass triggered several rounds of thunderstorms across central Illinois during the afternoon of May 22nd.
• Hail and Damaging Winds in Kentucky, May 22, 201161 kt wind · 11 eventsTemperatures during the afternoon of May 22 warmed into the 80s with dewpoints in the mid to upper 60s. A weak shortwave rounded the base of an upper level trough over the area. These led to an unstable atmosphere with CAPE values of 2000+ J/kg.
• Tornadoes and Hail in Minnesota, May 22, 20111 injured · $495,000 · EF2 · 6 eventsDuring the afternoon of May 22nd, severe thunderstorms developed along a cold front as it moved through southeast Minnesota. These severe thunderstorms produced two confirmed tornadoes, both of which were rated as EF2.
• Tornado and Hail in Iowa, May 22, 2011$139,000 · EF0 · 18 eventsThe upper level low pressure that affected the state the previous day continued to move closer to the state. A complicated setup took place as it approached. Initially, a pseudo warm front lifted north across the state.
• Hail and Damaging Wind in Indiana, May 22, 201152 kt wind · 2 eventsTemperatures during the afternoon of May 22 warmed into the 80s with dewpoints in the mid to upper 60s. A weak shortwave rounded the base of an upper level trough over the area. These led to an unstable atmosphere with CAPE values of 2000+ J/kg.
• 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.
• Tornadoes and Hail in Missouri, May 22, 2011$233,000 · EF1 · 26 eventsA cold front helped to generate severe thunderstorms, across portions of Missouri, mainly along the Interstate 70 corridor, in the afternoon hours of May 22, 2011. There were several reports of tornadoes, along with reports of hail and damaging wind.
• Tornadoes and Hail in Wisconsin, May 22, 2011$23,000 · EF1 · 27 eventsA strong low pressure system deepened as it moved north into central Minnesota by the afternoon of May 22nd. A cold front extended to the south from the surface low, while a warm front slowly pushed north into far northern Wisconsin.
• Hail and Damaging Winds in Indiana, May 22, 2011$25,000 · 1 in hail · 7 eventsAn unstable air mass along with moderate shear ahead of a upper level system, allowed for rapid thunderstorm development. A few reports of wind damage and hail were received.
• Tornadoes and Hail in Wisconsin, May 22, 20111 injured · $2.8 million · EF1 · 54 eventsSevere thunderstorms produced high winds, large hail, and a tornado across central and northeast Wisconsin on May 22, 2011. Unstable air combined with a surface boundary and an upper air disturbance to produce thunderstorms.
• Tornado and Hail in Kansas, May 22, 2011$500 · EF0 · 16 eventsA frontal boundary approaching from the west interacted with an unstable air mass, sparking a few intense thunderstorms over far southeast Kansas during the afternoon and early evening of the 22nd.
• Tornadoes and Hail in Iowa, May 22, 2011$543,000 · EF2 · 55 eventsA low pressure system over Minnesota pushed a cold front through eastern Iowa and northwest Illinois during the afternoon and night of May 22, sparking some showers and thunderstorms across the region.
• Tornadoes and Hail in Iowa, May 22, 20113 injured · $790,000 · EF2 · 8 eventsDuring the afternoon of May 22nd, severe thunderstorms developed along a cold front as it moved through northeast Iowa. These severe thunderstorms produced three confirmed tornadoes. The first tornado occurred in Howard County and was rated an EF2.
• Hail and Damaging Winds in Kentucky, May 22, 2011$44,000 · 1.5 in hail · 18 eventsNumerous strong to severe thunderstorms brought multiple rounds of severe weather to eastern KY during the afternoon and early evening hours of May 22nd. Numerous reports of 0.25 to 0.75 inch diameter hail and downed trees were received at the Jackson weather office on this day.
• Hail and Damaging Wind in Michigan, May 22, 20111.5 in hail · 4 eventsA couple marginally severe storms developed near Saginaw Bay.
• Tornadoes and Flash Flood in Illinois, May 22, 20111 injured · $1.0 million · EF1 · 50 eventsSevere thunderstorms moved across many areas of northern Illinois during the afternoon and evening hours of May 22nd.
• Hail and Damaging Winds in Michigan, May 22, 201160 kt wind · 7 eventsAn unstable air mass along with moderate shear ahead of a upper level system, allowed for rapid thunderstorm development. A few reports of wind damage and hail were received.
• Tornadoes and Hail in Wisconsin, May 22, 20111 injured · $347,000 · EF0 · 35 eventsA deep 500 mb low and associated surface low pressure tracked from eastern South Dakota into central Minnesota, lifting a warm front into Wisconsin during the early afternoon of May 22nd.
• Damaging Wind in Ohio, May 22, 201155 kt wind · 1 eventAn unstable air mass along with moderate shear ahead of a upper level system, allowed for rapid thunderstorm development. A few reports of wind damage and hail were received.
• Hail and Damaging Winds in West Virginia, May 22, 2011$10,000 · 1 in hail · 4 eventsThunderstorms developed in the afternoon instability. A moist southwest flow existed, well in advance of an approaching cold front.
• Tornado and Hail in Wisconsin, May 22, 2011$200,000 · EF1 · 5 eventsDuring the early afternoon of Sunday May 22nd, a line of thunderstorms developed across south central Minnesota, and quickly moved north and northeast across east-central Minnesota, and into west-central Wisconsin.
• Hail and Damaging Wind in Indiana, May 22, 20111.75 in hail · 4 eventsA weak mid level shortwave combined with moderate instability to produce severe thunderstorms with hail. These storms later evolved into heavy rain producing storms.
• Hail and Damaging Winds in Tennessee, May 22, 20111 in hail · 16 eventsA large area of thunderstorms across Central Kentucky and Middle Tennessee produced an outflow boundary which moved into Northeast Tennessee and Southwest Virginia.
• Hail and Damaging Winds in Missouri, May 22, 20112.5 in hail · 34 eventsA strong cold front was moving through the region. It triggered showers and thunderstorms...with numerous reports of large hail.
• Hail in Virginia, May 22, 20110.88 in hail · 1 eventThunderstorms developed in the afternoon instability. A moist southwest flow existed, well in advance of an approaching cold front.
• Hail in Michigan, May 22, 20111 in hail · 2 eventsSevere thunderstorms forming ahead of strong low pressure system moving through Minnesota produced large hail over portions of Gogebic and Iron counties on the afternoon of the 22nd.
• Tornado and Hail in Texas, May 22, 2011$146,000 · EF0 · 32 eventsNumerous supercell thunderstorms developed along a dryline northwest of the Fort Worth County Warning Area and spread east through the evening. A brief tornado damaged trees in Jack County.
• Tornado and Hail in Indiana, May 22, 2011$25,000 · EF1 · 3 eventsStrong to severe thunderstorms moved across northwest Indiana during the afternoon and evening hours of May 22nd.
• Hail in Kentucky, May 22, 20111.25 in hail · 5 eventsThunderstorms developed in the afternoon instability. A moist southwest flow existed, well in advance of an approaching cold front.
• Hail in Kentucky, May 22, 20110.88 in hail · 1 eventA weak mid level shortwave combined with moderate instability to produce severe thunderstorms with hail. These storms later evolved into heavy rain producing storms.
• Hail and Damaging Wind in Texas, May 22, 20114.5 in hail · 12 eventsScattered severe thunderstorms developed along and ahead of a dryline by late afternoon and early evening. A disturbance in the southwest flow aloft also aided in the development of the convection. The main impacts were large hail and strong damaging winds.
• Tornadoes and Hail in Missouri, May 22 to 23, 2011162 deaths · 1,153 injured · $2.8 billion · EF5 · 32 eventsA strong upper level trough across the central plains region and a strong upper level disturbance along with a frontal boundary in the area produced numerous severe storms with a few supercells across southeast Kansas.
• Hail and Damaging Wind in Kansas, May 22, 2011$50,000 · 2.5 in hail · 8 eventsA strong upper level trough across the central plains region and a strong upper level disturbance along with a frontal boundary in the area produced numerous severe storms with a few supercells across southeast Kansas.
• Hail and Damaging Winds in North Carolina, May 22, 20111 injured · 2 in hail · 16 eventsScattered thunderstorms developed along the North Carolina, Tennessee state line during the late afternoon hours. Some of the storms produced damaging winds and large hail. Additional thunderstorms developed over the foothills and western piedmont during the evening hours.
• Hail and Damaging Winds in Illinois, May 22, 2011$140,000 · 1.75 in hail · 26 eventsA low pressure system over Minnesota pushed a cold front through eastern Iowa and northwest Illinois during the afternoon and night of May 22, sparking some showers and thunderstorms across the region.
• 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.
• Hail and Damaging Winds in Oklahoma, May 22, 2011$2,000 · 4.5 in hail · 22 eventsThe afternoon of May 22nd was characterized by a sharp dry line which mixed to just east of the I-35 corridor by late afternoon. A cold front surged southward into central Oklahoma during the late afternoon.
• Hail in Ohio, May 22, 20110.88 in hail · 1 eventThunderstorms developed in the afternoon instability. A moist southwest flow existed, well in advance of an approaching cold front.
• Tornadoes and Hail in Oklahoma, May 22, 201114 injured · $2.9 million · EF3 · 38 eventsA very moist and very unstable air mass developed across eastern Oklahoma on the afternoon and evening of the 22nd as a dry line moved into the area from the west.
• Hail and Damaging Wind in Texas, May 22, 20111.75 in hail · 5 eventsA surface low was located over the Trans Pecos region during the afternoon hours on this day, with a dryline extending from the Big Bend area through the Permian Basin. Thunderstorms developed along this boundary, and quickly became severe.
• Hail and Damaging Winds in Utah, May 22, 201157 kt wind · 3 eventsThunderstorms formed across northern Utah on May 22nd, some of which produced strong wind gusts and penny-sized hail.
• Tornado in North Dakota, May 22, 2011EF0 · 3 eventsThe combination of low level instability and large scale ascent associated with a large upper level low over the Northern Plains led to one confirmed weak tornado touchdown over north central North Dakota. Two funnel cloud reports were also received.
• 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.
• Hail and Damaging Wind in North Carolina, May 22, 2011$5,000 · 1 in hail · 2 eventsStrong daytime heating combined with the passage of weak shortwave disturbances aloft resulted in isolated severe hail and severe thunderstorm wind damage in Hoke County.
• Hail and Damaging Wind in Texas, May 22, 2011$6,000 · 3 in hail · 6 eventsThunderstorms developed and quickly became severe, with several supercells moving northeast producing large hail and damaging winds.
• Damaging Winds in Michigan, May 22, 201152 kt wind · 4 eventsAn MCS moved into the southern portions of the county warning area during the evening hours. As the system move east northeast through southern lower Michigan, scattered wind damage was reported in Van Buren, Kalamazoo, Calhoun, and Ingham counties.
• Damaging Winds in Virginia, May 22, 201155 kt wind · 4 eventsA large area of thunderstorms across Central Kentucky and Middle Tennessee produced an outflow boundary which moved into Northeast Tennessee and Southwest Virginia.
• Hail and Damaging Wind in North Carolina, May 22, 2011$9,000 · 1.25 in hail · 4 eventsA lone thunderstorm developed during the late afternoon and strengthened to severe levels as it interacted with the seabreeze boundary just before sunset.
• Hail and Lightning Strike in Illinois, May 22, 2011$150,000 · 0.88 in hail · 2 eventsA strong cold front was moving through the region. It triggered showers and thunderstorms...with numerous reports of large hail.
• Tornado and Flash Flood in Arkansas, May 22 to 23, 2011$150,000 · EF1 · 12 eventsA moist and very unstable air mass developed across northwestern Arkansas during the afternoon and evening of the 22nd as a dry line moved into eastern Oklahoma from the west.
• 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.
• Damaging Winds in Virginia, May 22, 2011$4,000 · 52 kt wind · 4 eventsA southerly flow between upper-level low pressure over the Plains and upper-level high pressure over the Atlantic Ocean produced plenty of moisture over the region during the 22nd. A stationary boundary also remained over the area during this time.
• 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.
• Hail and Damaging Wind in Illinois, May 22, 2011$4,000 · 56 kt wind · 3 eventsA mesoscale convective system tracked eastward across southern Illinois. Moderate instability existed in a corridor ahead of this system, sustaining its eastward progress.
• Damaging Winds in Missouri, May 22, 2011$45,000 · 52 kt wind · 2 eventsA mesoscale convective system tracked eastward across southeast Missouri. Moderate instability existed in a corridor ahead of this system, sustaining its eastward progress.
• Hail in Arkansas, May 22, 20111.75 in hail · 1 eventA 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.
• Hail and Damaging Winds in Kentucky, May 23, 2011$80,000 · 61 kt wind · 3 eventsA mesoscale convective system tracked eastward across western Kentucky. Moderate instability existed in a corridor ahead of this system, sustaining its eastward progress.
• Tornado and Damaging Winds in Tennessee, May 23, 20112 injured · $412,000 · EF2 · 3 eventsDuring the morning hours on Monday, May 23rd, severe thunderstorms occurred across two counties in Middle Tennessee. This resulted in a thunderstorm wind damage events in these two counties.
• Hail and Damaging Winds in Indiana, May 23, 20111.75 in hail · 17 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.
• 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.
• Hail and Damaging Winds in Kentucky, May 23, 201156 kt wind · 3 eventsA short wave trough that moved eastward across the area produced severe thunderstorms during the morning hours.
• Hail in Kansas, May 23, 20111 in hail · 2 eventsThunderstorms were observed in Linn County, Kansas, during the early morning hours of May 23, 2011. There were two reports of hail.
• Damaging Winds in Kentucky, May 23, 2011$9,000 · 67 kt wind · 9 eventsA line of thunderstorms brought down trees and caused sporadic property damage in Clay, Estill, Jackson, and Laurel counties during the early morning hours of May 23rd.
• Hail and Damaging Winds in Kansas, May 23, 20111 in hail · 10 eventsDuring the early morning hours on the 20th, an approaching upper level disturbance interacted with a moist and unstable air mass resulting in a cluster of strong to severe thunderstorms over southeast Kansas.
• 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.
• Tornado and Flash Flooding in Oklahoma, May 23 to 24, 201114 injured · $75,000 · EF0 · 27 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 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.
• Hail and Damaging Winds in Missouri, May 23, 20111 in hail · 25 eventsA strong storm system was approaching the region. Numerous storms developed ahead of the system during the late morning and afternoon hours on May 23rd. There were numerous reports of damaging winds and large hail.
• Hail and Damaging Winds in Michigan, May 23, 2011$16,000 · 1.5 in hail · 25 eventsNumerous severe thunderstorms impacted areas south of M-59.
• Hail and Damaging Winds in Illinois, May 23, 20111 injured · $15,000 · 1 in hail · 10 eventsA strong storm system was approaching the region. Numerous storms developed ahead of the system during the late morning and afternoon hours on May 23rd. There were numerous reports of damaging winds and large hail.
• 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.
• Hail and Damaging Winds in Illinois, May 23, 2011$275,000 · 1.75 in hail · 14 eventsLow pressure tracking along a nearly stationary frontal boundary brought severe thunderstorms into southeast Illinois during the afternoon of May 23rd.
• Damaging Winds in Arkansas, May 23, 201150 kt wind · 5 eventsAn upper level disturbance moved through the region and interacted with an old convective outflow boundary across Southern Missouri and Northern Arkansas.
• Hail and Damaging Wind in North Carolina, May 23, 20112.5 in hail · 9 eventsIsolated thunderstorms developed along the lee trough over the North Carolina foothills during the afternoon hours. The storms mainly produced large hail, including a report of tennis ball size hailstones.
• Tornado and Flash Flooding in Indiana, May 23, 2011EF0 · 15 eventsA cold front moved through the region, interacting with moderate instability and strong shear. Numerous thunderstorms developed and became severe. A few of the storms took on supercell characteristics and produced brief tornadoes.
• Hail and Damaging Winds in North Carolina, May 23, 2011$10,000 · 1.75 in hail · 12 eventsA large supercell brought numerous reports of severe weather mainly to parts of Wilkes County but also into western Surry County.
• Damaging Winds in Virginia, May 23, 2011$10,000 · 52 kt wind · 2 eventsA southerly flow between upper-level low pressure over the Plains and upper-level high pressure over the Atlantic Ocean produced plenty of moisture over the region during the 23rd. A pressure trough also remained over the area during this time.
• Tornado and Hail in Illinois, May 23, 2011$327,000 · EF1 · 10 eventsA large cluster of thunderstorms increased in coverage and intensity as it accelerated eastward into a rapidly destabilizing air mass. The activity was closely related to a mid-level shortwave trough moving across Iowa and Missouri, along with a low level wind maximum.
• Hail and Lightning Strike in Colorado, May 23, 2011$1,000 · 1 in hail · 5 eventsSevere thunderstorms produced large hail, up to quarter size, across the northeast plains of Colorado. In addition, lightning struck a metal building and destroyed a nearby storage tank. The blast tossed an 8-inch concrete lid into the air.
• Hail and Damaging Winds in Indiana, May 23, 2011$222,000 · 1 in hail · 37 eventsA squall line pushed eastward across the area during the evening of the 23rd and gusts up to 80 mph resulted in numerous reports of wind damage and power outages.
• Hail and Damaging Winds in Indiana, May 23, 2011$4,000 · 1.25 in hail · 6 eventsA large cluster of thunderstorms increased in coverage and intensity as it accelerated eastward into a rapidly destabilizing air mass. The activity was closely related to a mid-level shortwave trough moving across Iowa and Missouri, along with a low level wind maximum.
• Tornado and Damaging Winds in Missouri, May 23, 2011$246,000 · EF0 · 6 eventsA large cluster of thunderstorms increased in coverage and intensity as it accelerated eastward into a rapidly destabilizing air mass. The activity was closely related to a mid-level shortwave trough moving across Iowa and Missouri, along with a low level wind maximum.
• Hail in Colorado, May 23, 20111 in hail · 1 eventA severe thunderstorm produced hail up to the size of quarters over extreme northwest El Paso County.
• Hail and Damaging Winds in Ohio, May 23, 2011$1.2 million · 1.75 in hail · 26 eventsDuring the early morning hours of May 23, an area of low pressure entered the Upper Great Lakes Region. Substantial amounts of warm air and deep moisture entered northern Ohio from the southern United States.
• Tornadoes and Hail in Pennsylvania, May 23, 2011$155,000 · EF2 · 9 eventsAn upper level disturbance moved out of the Ohio Valley and triggered severe thunderstorms and tornadoes across portions of central and eastern Pennsylvania. A total of 3 tornadoes were confirmed ranging in magnitude from EF1-EF2.
• Tornado and Flash Flood in Oklahoma, May 23, 2011EF0 · 66 eventsWidespread severe thunderstorms, including supercells, occurred over a large area of Oklahoma during the afternoon and evening hours of the 23rd. The thunderstorms were focused near two main boundaries. One was a dry line that was set up over the western third of Oklahoma.
• Hail in Kansas, May 23, 20112.75 in hail · 7 eventsDuring the late afternoon and early evening hours on the 23rd, several clusters of strong to severe thunderstorms affected portions of south-central and southeast Kansas. The culprit was an upper level disturbance and associated frontal boundary approaching from the west.
• Hail in Michigan, May 23, 20110.75 in hail · 1 eventA strong late afternoon thunderstorm affected portions of southeastern Jackson county, resulting in three quarters inch diameter hail in Napoleon.
• Hail in Kansas, May 23, 20111.75 in hail · 5 eventsIsolated strong to severe thunderstorms developed across northwest Kansas during the late afternoon hours. Several reports of large hail were received as the storms moved generally northeast.
• Hail and Damaging Winds in Tennessee, May 23, 20111 in hail · 4 eventsAn upper level disturbance moved through the region and interacted with an old convective outflow boundary across Southern Missouri and Northern Arkansas.
• Hail in Maryland, May 23, 20111 in hail · 1 eventA southerly flow between upper-level low pressure over the Plains and upper-level high pressure over the Atlantic Ocean produced plenty of moisture over the region during the 23rd. A pressure trough also remained over the area during this time.
• Damaging Wind in Florida, May 23, 201150 kt wind · 1 eventAn isolated sea breeze thunderstorm produced wind damage.
• Hail and Damaging Wind in Virginia, May 23, 2011$2,000 · 1 in hail · 2 eventsIsolated severe thunderstorms associated with a warm front produced damaging winds and large hail across portions of south central and southeast Virginia.
• Hail in North Carolina, May 23, 20111 in hail · 2 eventsA weak upper level disturbance passing across the area during peak afternoon heating produced isolated pulse severe hail in Halifax and Edgecombe Counties.
• Tornado in Michigan, May 23, 2011EF0 · 1 eventWeak low pressure at the surface and aloft helped spin up a weak tornado in the Helmer Bay portion of Manistique Lake in southern Luce County on the evening of the 23rd. After formation the weak tornado then moved south toward Curtis in Mackinac County.
• Tornado in Michigan, May 23, 2011EF0 · 1 eventScattered rain showers developed over Upper Michigan on the afternoon of the 23rd. These did not get especially strong, but one managed to produce a waterspout.
• Tornadoes and Hail in Indiana, May 23, 2011$181,000 · EF0 · 12 eventsA quasi-linear convective system moved across an unstable airmass and produced widespread severe weather.
• Hail and Damaging Wind in North Carolina, May 23, 2011$2,000 · 1.75 in hail · 4 eventsScattered severe thunderstorms associated with a warm front produced damaging winds and large hail across portions of northeast North Carolina.
• Hail in Texas, May 23, 20112.75 in hail · 3 eventsAn isolated supercell moved east through northern Texas, producing hail larger than baseballs.
• Hail in Virginia, May 23, 20111 in hail · 2 eventsIsolated storms drifted across the area and became briefly severe over Amherst County.
• Tornado in Ohio, May 23, 2011EF1 · 1 eventA cold front moved through the region, interacting with moderate instability and strong shear. Numerous thunderstorms developed and became severe. A few of the storms took on supercell characteristics and produced brief tornadoes.
• Tornadoes and Damaging Winds in Ohio, May 23, 2011$452,000 · EF1 · 64 eventsA quasi-linear convective system moved across an unstable airmass and produced widespread severe weather.
• Damaging Winds in Kentucky, May 23, 2011$10,000 · 52 kt wind · 6 eventsA quasi-linear convective system moved across an unstable airmass and produced widespread severe weather.
• Tornado and Damaging Winds in Pennsylvania, May 23, 20111 injured · $76,000 · EF0 · 11 eventsShowers and thunderstorms that rode along a warm frontal boundary during the evening of the 23rd produced a tornado in Carbon County, a couple of other funnel clouds in the Poconos and Lehigh Valley and pockets of wind damage in the Poconos and Lehigh Valley.
• Hail in Nebraska, May 23, 20111 in hail · 2 eventsIsolated strong to severe thunderstorms developed across southwest Nebraska during the late afternoon and early evening hours. Several reports of large hail were received as the storms moved generally northeast.
• Tornado and Hail in Kentucky, May 23, 20111 injured · $354,000 · EF2 · 3 eventsA large cluster of thunderstorms increased in coverage and intensity as it accelerated eastward into a rapidly destabilizing air mass. The activity was closely related to a mid-level shortwave trough moving across Iowa and Missouri, along with a low level wind maximum.
• Damaging Winds in Pennsylvania, May 23, 2011$25,000 · 50 kt wind · 3 eventsDuring the early morning hours of May 23, an area of low pressure entered the Upper Great Lakes Region. Substantial amounts of warm air and deep moisture entered northern Ohio from the southern United States.
• Hail in Maryland, May 23, 20111.75 in hail · 1 eventAn isolated severe thunderstorm formed preceding a lee side trof in Caroline County.
• Hail in Nebraska, May 23, 20111.75 in hail · 4 eventsAn upper level disturbance which lifted out of the Rockies helped initiate severe thunderstorms over southwest Nebraska. The largest hail recorded was 1.75 inches in Chase County.
• Flash Flood in Montana, May 23, 20111 eventEfficient rain producing thunderstorms moved across Stillwater County, resulting in a localized flash flood.
• 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.
• Damaging Wind in New Jersey, May 23, 201152 kt wind · 1 eventShowers and thunderstorms that rode along a warm frontal boundary during the evening of the 23rd moved through northwest New Jersey. They weakened as they crossed into New Jersey, but still produced wind damage in Warren County.
• Flash Flood in South Dakota, May 23, 2011$10,000 · 1 eventFlash flooding occurred over portions of western Custer County when a slow moving thunderstorm produced two inches of rain in less than an hour.
• Hail in Missouri, May 23, 20111 in hail · 1 eventA weak frontal boundary, along the Highway 36 corridor, helped to generate a few evening thunderstorms, on May 23, 2011.
• Hail and Damaging Wind in Pennsylvania, May 23, 2011$5,000 · 1 in hail · 3 eventsIsolated severe thunderstorms developed as an upper level disturbance moved along a stalled frontal boundary over the Ohio Valley.
• Hail and Damaging Winds in Kentucky, May 23, 2011$6,000 · 50 kt wind · 3 eventsA well defined squall line raced northeast up the Ohio Valley during the afternoon, reaching northeast Kentucky during the evening.
• Damaging Winds in Ohio, May 23, 2011$42,000 · 50 kt wind · 10 eventsA well defined squall line raced northeast up the Ohio Valley during the afternoon, reaching southeast Ohio during the evening.
• Damaging Winds in Ohio, May 23, 2011$10,000 · 50 kt wind · 2 eventsIsolated severe thunderstorms developed as an upper level disturbance moved along a stalled frontal boundary over the Ohio Valley.
• Damaging Winds in West Virginia, May 23, 2011$23,000 · 50 kt wind · 3 eventsA well defined squall line raced northeast up the Ohio Valley during the afternoon, reaching western West Virginia in the evening, before weakening.
• Lightning Strike in Nebraska, May 23, 2011$6,000 · 1 eventA lightning strike from a night time thunderstorm struck the KNGN radio tower in McCook, Nebraska, damaging the main and backup power sources and knocking the station off the air for several days.
• Tornadoes and Hail in Kansas, May 24 to 25, 20112 deaths · 1 injured · $124,000 · EF2 · 72 eventsA vigorous upper level disturbance, jet streak dynamics and a strong dry line combined to produce numerous rotating thunderstorms. Large hail, flooding rains, and tornadoes were observed.
• Hail and Damaging Winds in Tennessee, May 24, 2011$145,000 · 2 in hail · 13 eventsSevere thunderstorms occurred across seven Middle Tennessee counties from the early morning through mid afternoon hours on Tuesday, May 24th. As a result, thunderstorm wind damage and large hail events to occur across these counties.
• Damaging Winds and Lightning Strike in Kentucky, May 24, 2011$15,000 · 52 kt wind · 3 eventsA moist airmass combined with a shortwave in the upper level flow sparked showers and thunderstorms across central KY early May 24. Though most of the storms remained elevated, there were a couple of isolated damaging wind reports.
• 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.
• Hail and Damaging Winds in Kansas, May 24, 20111 in hail · 4 eventsA line of strong to severe thunderstorms raced across Central Kansas during the early morning hours on the 24th, in response to an upper level disturbance approaching from the west. Penny to quarter size hail and 50 to 60 mph winds occurred across Russell and Lincoln counties.
• Hail in Virginia, May 24, 2011$5,000 · 1.25 in hail · 2 eventsA disturbance in the winds aloft helped trigger a round of morning convection. The storms moved into Virginia from eastern Kentucky.
• Hail and Damaging Winds in Virginia, May 24, 2011$49,000 · 1.75 in hail · 28 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.
• Tornado and Damaging Winds in Virginia, May 24, 2011$30,000 · EF0 · 8 eventsA short wave trough moving through the Mid Mississippi and Lower Ohio Valley produced strong convection across Kentucky and Northern Middle Tennessee early in the day.
• Hail in Kansas, May 24, 20111.75 in hail · 3 eventsA severe thunderstorm brought large hail to Lancaster, Kansas, during the morning hours of May 24, 2011.
• Tornadoes and Flood in Arkansas, May 24 to 26, 20113 deaths · 15 injured · $19 million · EF3 · 42 eventsThunderstorms developed ahead of a cold front to the west of Arkansas on the evening of the 24th, entered western Arkansas during the late evening hours, and continued into the wee hours of the 25th. Severe weather, including two killer tornadoes, occurred in western Arkansas.
• Tornado and Hail in Colorado, May 24, 2011EF0 · 4 eventsSevere thunderstorms produced hail up to the size of quarters over southeast Colorado and a brief tornado east of Lamar (Prowers County).
• Hail and Damaging Winds in Tennessee, May 24, 20111 in hail · 8 eventsA short wave trough moving through the Mid Mississippi and Lower Ohio Valley produced strong convection across Kentucky and Northern Middle Tennessee early in the day.
• Hail and Damaging Winds in Kansas, May 24, 201152 kt wind · 3 eventsDuring the very early morning hours of May 24 brief thunderstorms brought some small hail, then in the afternoon a line of thunderstorms moved through portions of central Kansas bringing strong gusty winds.
• 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.
• Hail and Damaging Winds in Missouri, May 24, 20111.5 in hail · 14 eventsA line of thunderstorms moved east along the Interstate 70 corridor, during the late morning and early afternoon hours of May 24, 2011. There were several reports of hail and high winds.
• Hail and Damaging Winds in Virginia, May 24, 20111 death · 5 injured · $52,000 · 1.75 in hail · 32 eventsScattered severe thunderstorms well in advance of a cold front produced damaging winds and large hail across portions of south central and southeast Virginia.
• Hail in Oklahoma, May 24, 20111 in hail · 1 eventA severe thunderstorm developed across the western Oklahoma Panhandle during the early afternoon hours which produced some hail. No damages or injuries were reported.
• Hail in Illinois, May 24, 20111.75 in hail · 2 eventsA strong low pressure system in the southern plains pushed widespread rain and scattered thunderstorms into eastern Iowa and northwest Illinois during the afternoon and evening of May 24. Some of the storms were severe, producing large hail, damaging winds, and heavy rains.
• Tornadoes and Hail in Oklahoma, May 24, 201111 deaths · 342 injured · $10,000 · EF5 · 61 eventsA tornado outbreak occurred over parts of northern and central Oklahoma during the day on the 24th, with violent tornadoes devastating several communities.
• Damaging Winds and Lightning Strike in Iowa, May 24, 2011$57,000 · 61 kt wind · 11 eventsA trough of low pressure lifted north into Iowa during the day on the 24th. A weak short wave lifted northeast across the boundary. Strong thunderstorms fired to the south of Iowa and became enhanced as they interacted with the boundary.
• 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.
• Tornadoes and Hail in Texas, May 24, 20111 death · 1 injured · $4.5 million · EF2 · 129 eventsThree rounds of thunderstorms affected north Texas with 10 tornadoes confirmed. The atmosphere was highly unstable on this day and a High Risk was issued by the Storm Prediction Center for the northwestern counties of north Texas while a Moderate Risk covered much of the rest of…
• Hail in Maryland, May 24, 20111 in hail · 2 eventsA surface trough combined with moderate amounts of instability to trigger showers and thunderstorms during the 24th. A few thunderstorm did produce large hail due to the moderate amounts of instability.
• Hail and Damaging Winds in Kansas, May 24, 2011$31,000 · 1 in hail · 14 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.
• Tornadoes and Hail in Kansas, May 24, 20111 injured · $476,000 · EF1 · 68 eventsA strong upper level disturbance and associated frontal boundary interacted with a moist and unstable air mass to produce a couple rounds of widespread strong to severe thunderstorms across central, south-central and southeast Kansas during the afternoon and evening hours on the…
• Hail and Damaging Winds in Iowa, May 24, 2011$55,000 · 1.75 in hail · 9 eventsA strong low pressure system in the southern plains pushed widespread rain and scattered thunderstorms into eastern Iowa and northwest Illinois during the afternoon and evening of May 24. Some of the storms were severe, producing large hail, damaging winds, and heavy rains.
• Hail in Wyoming, May 24, 20111 in hail · 1 eventA severe thunderstorm produced nickel to quarter sized hail and heavy rain north of Rozet.
• 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.
• Hail in Indiana, May 24, 20111.75 in hail · 3 eventsA stationary boundary extended from Iowa into portions of northern Indiana. An unstable air mass and moderate shear combined for thunderstorm development. While wind fields were not overly impressive, degree of shear and lift allowed for storms which produced hail.
• Flash Flood in Wyoming, May 24, 20111 eventShowers and thunderstorms in the Sheridan area produced between one half and one and a half inches of rain in about a 90 minute period.
• Hail in Nebraska, May 24, 20111.25 in hail · 1 eventA late afternoon thunderstorm dropped half dollar sized hail southwest of Hemingford.
• Tornadoes and Hail in Oklahoma, May 24, 20111 injured · $860,000 · EF2 · 61 eventsSevere thunderstorms developed along a dry line over central Oklahoma during the afternoon hours.
• Hail in North Carolina, May 24, 20110.75 in hail · 1 eventA thunderstorm produced small hail over the North Carolina foothills.
• Flash Flood in Colorado, May 24, 2011$10,000 · 1 eventHeavy rain produced flash flooding over portions of Washington County, where up to a foot of water was running across some county roads.
• 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.
• Hail and Damaging Winds in Kansas, May 24, 20111 in hail · 7 eventsA dissipating line of thunderstorms moved through the area, during the late evening hours of May 24, 2011. There were several reports of hail and damaging winds.
• Flash Flood in Nebraska, May 24 to 25, 20111 eventSlow moving thunderstorms produced very heavy rainfall over parts of Hayes and Frontier counties overnight from May 24th into the 25th. As the ground became saturated runoff increased to produce rapid rise on Medicine Creek in Frontier County.
• Tornadoes and Hail in Missouri, May 24 to 25, 2011$502,000 · EF1 · 76 eventsA powerful upper level low pressure system moved across the Ozarks causing numerous strong to severe storms to develop with several supercells as well.
• Hail and Damaging Winds in Missouri, May 24 to 25, 2011$2,000 · 1 in hail · 5 eventsA dissipating line of thunderstorms moved through the area, during the late evening hours of May 24, 2011, into the early morning hours of May 25, 2011. There were several reports of hail and damaging winds.
• Tornadoes and Flash Flooding in Indiana, May 24 to 25, 20111 injured · $1.6 million · EF3 · 137 eventsThe approach of a strong low pressure system from the west set the stage for a significant severe weather outbreak across central Indiana on May 25th. Eight tornadoes touched down in central Indiana, with an additional one moving into the area from southern Indiana.
• Tornadoes and Hail in Arkansas, May 24, 20113 deaths · 16 injured · $3.6 million · EF4 · 10 eventsSevere thunderstorms developed along a dry line over central Oklahoma during the afternoon hours.
• Flash Flood in Wyoming, May 24 to 25, 20111 eventVery heavy rainfall resulted in flash flooding across portions of Sheridan.
• Lightning Strike in Iowa, May 25, 2011$25,000 · 1 eventA large area of thunderstorms rotated northeast out of Missouri during the evening of the 24th into the early morning of the 25th. As the storms moved through the Clarke County area, lightning struck at Terrible's Lakeside Casino.
• Hail and Damaging Winds in Missouri, May 25, 201156 kt wind · 7 eventsA large mesoscale convective system moved through the region during the early morning hours of May 25th. There were several reports of large hail and damaging winds with the storms.
• Hail in Texas, May 25 to 26, 2011$3,000 · 1.75 in hail · 20 eventsAn upper level trough of low pressure combined with a dryline to produce severe thunderstorms on consecutive days. The first day there were severe storms in Llano, Burnet, Williamson, and Travis counties.
• Tornadoes and Flash Flood in Iowa, May 25, 2011$330,000 · EF1 · 7 eventsA low pressure system brought showers and thunderstorms to eastern Iowa, northeast Missouri, and northwest Illinois during the afternoon and evening of May 25.
• 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.
• Tornadoes and Hail in Illinois, May 25, 20111 injured · $1.4 million · EF1 · 27 eventsStrong thunderstorms developed along an advancing warm front between 2 AM and 9 AM on May 25th. Some of the storms became severe, producing scattered wind damage from Morgan County northeastward to Tazewell County.
• Tornado and Flash Flooding in Illinois, May 25 to 26, 2011$685,000 · EF1 · 13 eventsA line of thunderstorms moved across parts of northeast and eastern Illinois during the morning hours of May 25th producing a tornado near St. Anne as well as heavy rain and some flooding.
• Tornadoes and Hail in Indiana, May 25, 2011$131,000 · EF2 · 7 eventsA line of strong to severe thunderstorms moved northeast across northwest Indiana during the morning hours of May 25th producing several tornadoes as well as heavy rain.
• Tornado and Flash Flood in Indiana, May 25, 2011EF0 · 28 eventsA warm front was located from southwestern Indiana into northwestern Ohio through the 25th and into the early morning hours of the 26th. Several waves moved along the front, with each one generating thunderstorms.
• Tornadoes in Kansas, May 25, 2011$15,000 · EF0 · 5 eventsA very warm and moist airmass had advected northwest into the area, during the morning hours of May 25, 2011, with the development of an intensifying warm front, across extreme east central Kansas.
• Tornadoes and Flash Flooding in Missouri, May 25, 201120 injured · $4.0 million · EF2 · 23 eventsA very warm and moist airmass had advected northwest into the area, during the morning hours of May 25, 2011, with the development of an intensifying warm front, near the Highway 50 corridor.
• Tornadoes and Flash Flooding in Illinois, May 25, 2011$1.5 million · EF2 · 63 eventsA deep area of low pressure lifting from the Plains into the Upper Midwest pulled a strong cold front eastward toward the Mississippi River during the afternoon of May 25th.
• 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.
• Tornadoes and Flash Flooding in Missouri, May 25, 2011$200,000 · EF1 · 59 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.
• Tornado and Flash Flooding in Ohio, May 25, 2011$250,000 · EF0 · 9 eventsA warm front was located from southwestern Indiana into northwestern Ohio through the 25th and into the early morning hours of the 26th. Several waves moved along the front, with each one generating thunderstorms.
• Tornadoes and Hail in Missouri, May 25, 20112 injured · $1.2 million · EF3 · 29 eventsNumerous strong to severe thunderstorms occurred in the warm sector of a low pressure system over central Missouri. The air mass in the warm sector was very unstable, with afternoon mixed-layer cape values in the 2500 to 4000 j/kg range.
• Tornadoes and Flash Flooding in Ohio, May 25 to 27, 2011$90 million · EF1 · 115 eventsBetween May 25th and May 26th heavy rainfall occurred as a warm front lifted north across the area. A strong southerly flow, ahead of a cold front, transported very moist air through Tennessee, Kentucky and into Ohio on the 25th. Surface dew points were in the 60s.
• Tornadoes and Hail in Arkansas, May 25, 2011$500,000 · EF1 · 17 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 Flood and Damaging Winds in Missouri, May 25, 201152 kt wind · 3 eventsA low pressure system brought showers and thunderstorms to eastern Iowa, northeast Missouri, and northwest Illinois during the afternoon and evening of May 25.
• Tornadoes and Hail in Ohio, May 25 to 26, 20112 injured · $530,000 · EF1 · 79 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 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.
• Hail in Texas, May 25, 20111.75 in hail · 4 eventsSevere thunderstorms developed along and ahead of a dry line which moved out of north Texas and southern Oklahoma. Shear was very strong ahead of the dry line in the lower and mid levels of the atmosphere.
• Tornadoes and Hail in Illinois, May 25, 2011$5.7 million · EF2 · 48 eventsNumerous strong to severe thunderstorms occurred in the warm sector of a low pressure system over central Missouri. The air mass in the warm sector was very unstable, with afternoon mixed-layer cape values in the 2500 to 4000 j/kg range.
• Tornadoes and Hail in Louisiana, May 25, 2011$500,000 · EF1 · 18 eventsSevere thunderstorms developed along and ahead of a dry line which moved out of north Texas and southern Oklahoma. Shear was very strong ahead of the dry line in the lower and mid levels of the atmosphere.
• Hail and Damaging Winds in Missouri, May 25, 20111 in hail · 9 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.
• Tornadoes and Hail in Indiana, May 25, 2011$330,000 · EF2 · 14 eventsWarm humid air in place across the Lower Ohio Valley ahead of deep closed low over Missouri led to widespread severe weather across the lower Missouri Valley and Indiana.
• Hail and Damaging Winds in Kentucky, May 25, 2011$27,000 · 78 kt wind · 7 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 in Nebraska, May 25, 2011$1,000 · 1 eventHeavy rain producing thunderstorms wrapped around low pressure that tracked south of the region. The resultant training of echoes over far southeast Nebraska caused an isolated flash flooding report near Falls City.
• Hail and Damaging Winds in Tennessee, May 25, 2011$1.2 million · 1.75 in hail · 22 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.
• Tornadoes and Hail in Kentucky, May 25, 2011$2.3 million · EF0 · 53 eventsNumerous strong to severe thunderstorms occurred in the warm sector of a low pressure system over central Missouri. The air mass in the warm sector was very unstable, with afternoon mixed-layer cape values in the 2500 to 4000 j/kg range.
• Tornadoes in California, May 25, 2011$870,000 · EF2 · 3 eventsThree tornadoes moved through Glenn and Butte Counties the evening of May 25, 2011. Significant damage was caused to several structures and thousands of almond trees were destroyed.
• Damaging Wind in Arkansas, May 25, 20111 injured · $40,000 · 54 kt wind · 1 eventSevere thunderstorms developed along and ahead of a dry line which moved out of north Texas and southern Oklahoma. Shear was very strong ahead of the dry line in the lower and mid levels of the atmosphere.
• Damaging Winds in Pennsylvania, May 25, 2011$45,000 · 50 kt wind · 2 eventsA warm front lifted into northwestern Pennsylvania during the evening hours of May 25th. Showers and thunderstorms developed in association with this front. A few of the stronger thunderstorms became severe.
• 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.
• Tornado and Hail in Arkansas, May 25, 2011$260,000 · EF2 · 5 eventsA powerful, late season low pressure system brought a few severe thunderstorms to extreme southeast Arkansas during the late evening hours of May 25th. The storms produced damaging winds, large hail and a tornado.
• Tornadoes and Damaging Winds in Indiana, May 25, 20111 injured · $500,000 · EF2 · 17 eventsNumerous strong to severe thunderstorms occurred in the warm sector of a low pressure system over central Missouri. The air mass in the warm sector was very unstable, with afternoon mixed-layer cape values in the 2500 to 4000 j/kg range.
• 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.
• Hail and Damaging Winds in Pennsylvania, May 25, 2011$46,000 · 50 kt wind · 13 eventsIsolated severe thunderstorms developed in an area of instability out ahead of an approaching warm front in northwestern Pennsylvania.
• Hail and Damaging Winds in Louisiana, May 25, 2011$40,000 · 2.5 in hail · 9 eventsTwo supercell thunderstorms developed across northern Louisiana and moved southeast into central Louisiana late on May 25 into the early morning hours on May 26. Numerous reports of large hail and damaging winds were received.
• Damaging Winds in Pennsylvania, May 25, 2011$35,000 · 61 kt wind · 6 eventsA fast-moving squall line moved quickly east across northern Pennsylvania from the late evening hours through just after midnight on 25 May 2011. The line of severe thunderstorms produced isolated wind damage as it raced through the northern mountains.
• Damaging Winds in New York, May 25, 2011$125,000 · 80 kt wind · 2 eventsThunderstorms developed ahead of a warm front across the southern tier. The thunderstorms produced wind gusts measured to 60 mph however damage indicated wind gusts estimated to 80 to 85 mph. Just north of Kiantone, Chautauqua County, trees were down and blocked route 62.
• Tornadoes and Hail in Texas, May 25 to 26, 2011$97,000 · EF0 · 23 eventsThe trailing cold front from a strong storm system across the north central states triggered evening and overnight severe thunderstorms with very large hail and strong wind gusts across portions of southeast Texas.
• Hail and Damaging Winds in Tennessee, May 25 to 26, 20111 injured · $528,000 · 1 in hail · 49 eventsSevere thunderstorms occurred across multiple Middle Tennessee counties during the evening hours on Wednesday, July 25th. This resulted in thunderstorm wind damage, large hail, and even some funnel cloud events. A person was also struck by lightning in Lawrence County.
• Damaging Winds in Kentucky, May 25, 2011$60,000 · 65 kt wind · 13 eventsWarm humid air overspread the Ohio Valley ahead a a strong closed low located over Missouri. By late afternoon on the 25th, discrete supercells over western Kentucky were beginning to congeal into a squall line.
• Damaging Wind in Louisiana, May 25, 201150 kt wind · 1 eventA powerful, late season, low pressure system brought a few thunderstorms to northeast Louisiana late on May 25th. One of the thunderstorms downed a few trees in Bastrop.
• Tornadoes and Damaging Winds in Alabama, May 25, 20111 injured · $962,000 · EF2 · 31 eventsSupercells in northern Mississippi transitioned into a quasi-linear convective system (QLCS) which progressed eastward through northern Alabama.
• Hail and Damaging Winds in New York, May 25 to 26, 2011$568,000 · 2 in hail · 69 eventsA deep upper level low pressure system shifted east from the mid-Mississippi Valley region through the afternoon and evening.
• Tornado and Hail in Pennsylvania, May 26, 2011$395,000 · EF1 · 9 eventsA frontal boundary oriented west-east across northwest Pennsylvania was the focus for the development of numerous showers and thunderstorms on May 26. During the afternoon hours on the 26th, the boundary slowly retreated north as a cold front approached the region.
• Damaging Wind in Tennessee, May 25, 2011$25,000 · 56 kt wind · 1 eventSupercells in northern Mississippi and western Tennessee transitioned into a quasi-linear convective system (QLCS) which progressed eastward into southern middle Tennessee.
• Damaging Winds in Pennsylvania, May 26, 2011$55,000 · 50 kt wind · 22 eventsA slow moving low pressure system, and it's associated cold front crossed through the region late in the day on the 26th. Scattered severe thunderstorms, most of which produced wind damage, developed along the frontal boundary in an area of instability and high shear.
• Hail and Damaging Winds in Georgia, May 26 to 27, 20113 deaths · $4.8 million · 4.25 in hail · 68 eventsA deep, closed upper low was moving from the Southern Plains into the mid-south with an accompanying strong Pacific cold front.
• Hail and Damaging Winds in Alabama, May 25 to 26, 2011$54,000 · 1.75 in hail · 37 eventsA cold front pushing through the southeastern United States brought numerous thunderstorms to Central Alabama. Many of these storms produced damaging winds and large hail.
• Tornado and Damaging Winds in Tennessee, May 26, 2011$243,000 · EF0 · 14 eventsSevere thunderstorms occurred across eleven Middle Tennessee counties through the morning hours on Thursday, July 26th. This resulted in thunderstorm wind damage events across these counties.
• Hail and Damaging Winds in Tennessee, May 26, 20112 in hail · 44 eventsThe atmosphere destabilized during the late morning into afternoon period as a cold front progressed into the Southern Appalachian region. Large hail was the primary mode of severe weather as a pocket of cold air aloft moved across the forecast area.
• Hail and Damaging Winds in Kentucky, May 26, 2011$36,000 · 1 in hail · 16 eventsA fast moving line of strong to severe thunderstorms downed numerous trees across portions of eastern KY during the overnight hours of May 26th. The majority of the damage occurred in Pulaski, Laurel, Wayne, and Clay counties.
• Hail and Damaging Wind in Texas, May 26, 20111.75 in hail · 2 eventsAn area of thunderstorms occurred over the Victoria Crossroads region during the early morning hours of May 26th.
• Hail and Damaging Winds in New York, May 26, 2011$2,000 · 1.25 in hail · 13 eventsA surface low as well as upper atmospheric energy traveled along a quasi-stationary boundary across northern New York during the afternoon of May 26th.
• Hail and Damaging Winds in Alabama, May 26, 2011$6,000 · 1.75 in hail · 9 eventsThunderstorms developed during the late morning hours along and ahead of a cold front in northwest into north central Alabama. One of the more severe storms produced hail up to golf ball sized. Trees and power lines were knocked down in a few areas.
• Tornado and Hail in Mississippi, May 26, 2011$30,000 · EF0 · 5 eventsA cold front moved through southern Mississippi and southeast Louisiana during the daytime hours on May 26. Numerous reports of hail and wind damage were received, as well as several reports of tornadoes.
• Hail in Alabama, May 26, 20111.75 in hail · 4 eventsThunderstorms produced large hail across portions of southwest Alabama.
• Damaging Wind in Alabama, May 26, 2011$5,000 · 60 kt wind · 1 eventThunderstorms produced high winds and large hail that caused damage across southwest Alabama.
• Damaging Wind in Mississippi, May 26, 2011$7,000 · 61 kt wind · 1 eventThunderstorms produced high winds that caused damage in southeast Mississippi.
• 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.
• Damaging Winds in New York, May 26, 2011$61,000 · 55 kt wind · 6 eventsA slow moving cold front generated showers and thunderstorms across the region. One of these storms downed trees and wires in Sherman and Mayville in Chautauqua County.
• Damaging Wind in Kentucky, May 26, 2011$3,000 · 50 kt wind · 1 eventA weak shortwave spinning around a strong low pressure system triggered severe thunderstorms during the afternoon of May 26th.
• Hail and Damaging Winds in West Virginia, May 26, 2011$10,000 · 2 in hail · 17 eventsSevere thunderstorms developed on the afternoon of May 26th in a very unstable air mass across southeast West Virginia. These storms were primarily large hail producers.
• Hail and Damaging Winds in West Virginia, May 26, 2011$11,000 · 1.5 in hail · 17 eventsA southerly flow between upper-level low pressure over the Midwest and upper-level high pressure over the Atlantic Ocean produced a warm and moist airmass over the region. A surface trough also remained overhead during this time.
• Hail and Damaging Winds in West Virginia, May 26, 2011$33,000 · 1 in hail · 7 eventsConvection fired in the afternoon ahead of a disturbance aloft. The most instability was over the mountainous counties.
• Tornadoes and Flash Flood in Pennsylvania, May 26, 201110 injured · $644,000 · EF1 · 72 eventsA significant severe weather outbreak occurred across central Pennsylvania during the afternoon and evening hours on 26 May 2011. A total of 6 tornadoes were confirmed ranging from EF0-EF2 in magnitude with multiple reports of large hail and damaging thunderstorm winds.
• Hail and Damaging Winds in Maryland, May 26, 2011$36,000 · 2.75 in hail · 38 eventsA southerly flow between upper-level low pressure over the Midwest and upper-level high pressure over the Atlantic Ocean produced a warm and moist airmass over the region. A surface trough also remained overhead during this time.
• Flash Flood in Indiana, May 26, 20111 eventThunderstorms developed and produced heavy rainfall over an already saturated caused flooding across portions of Allen County.
• Hail and Damaging Winds in New York, May 26, 20111.75 in hail · 37 eventsA nearly stationary frontal boundary was draped across western and northern New York State as several waves of low pressure moved easterly along the boundary. In addition, a warm front lifted northeastward across the east central New York during the morning hours.
• Hail and Damaging Winds in North Carolina, May 26, 20111.5 in hail · 24 eventsNumerous showers and thunderstorms affected the western Carolinas and northeast Georgia during the afternoon and evening hours. Some of the thunderstorms were severe, producing large hail and damaging straight line wind.
• Hail and Damaging Winds in West Virginia, May 26, 2011$12,000 · 80 kt wind · 5 eventsA slow moving low pressure system, and it's associated cold front crossed through the region late in the day on the 26th. Scattered severe thunderstorms, most of which produced wind damage, developed along the frontal boundary in an area of instability and high shear.
• Hail in North Carolina, May 26, 20111 in hail · 1 eventThe atmosphere destabilized during the late morning into afternoon period as a cold front progressed into the Southern Appalachian region. Large hail was the primary mode of severe weather as a pocket of cold air aloft moved across the forecast area.
• Hail and Damaging Winds in Virginia, May 26, 2011$13,000 · 1.5 in hail · 11 eventsA southerly flow between upper-level low pressure over the Midwest and upper-level high pressure over the Atlantic Ocean produced a warm and moist airmass over the region. A surface trough also remained overhead during this time.
• Tornadoes and Hail in Ohio, May 26, 2011$1,000 · EF0 · 5 eventsA weak shortwave spinning around a strong low pressure system triggered severe thunderstorms during the afternoon of May 26th.
• Flash Flood in West Virginia, May 26, 20111 eventThunderstorms developed ahead of a stationary front and trained across the same areas of eastern West Virginia during the afternoon and early evening. Rainfall of over 2 inches produced flash flooding in Mineral County.
• Tornado and Hail in Louisiana, May 26, 20114 injured · $405,000 · EF3 · 11 eventsA cold front moved through southern Mississippi and southeast Louisiana during the daytime hours on May 26. Numerous reports of hail and wind damage were received, as well as several reports of tornadoes.
• Tornado and Hail in Pennsylvania, May 26, 2011$103,000 · EF1 · 24 eventsA deep upper level low pressure system shifted east from the mid-Mississippi Valley region through the afternoon and evening.
• 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.
• Damaging Wind in Maryland, May 26, 2011$1,000 · 50 kt wind · 1 eventA slow moving low pressure system, and it's associated cold front crossed through the region late in the day on the 26th. Scattered severe thunderstorms, most of which produced wind damage, developed along the frontal boundary in an area of instability and high shear.
• Hail and Damaging Winds in Georgia, May 26 to 27, 2011$13,000 · 1.75 in hail · 6 eventsAn upper level trough and surface cold front spawned scattered thunderstorms. A few became severe with large hail and damaging winds.
• Hail in Virginia, May 26, 20111 in hail · 2 eventsThe atmosphere destabilized during the late morning into afternoon period as a cold front progressed into the Southern Appalachian region. Large hail was the primary mode of severe weather as a pocket of cold air aloft moved across the forecast area.
• Tornado and Hail in South Carolina, May 26, 2011EF0 · 18 eventsNumerous showers and thunderstorms affected the western Carolinas and northeast Georgia during the afternoon and evening hours. Some of the thunderstorms were severe, producing large hail and damaging straight line wind.
• 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.
• Hail and Damaging Winds in Pennsylvania, May 26, 2011$60,000 · 3 in hail · 16 eventsA lee side trough helped trigger a line of strong to severe thunderstorms that moved through Berks County, the Lehigh Valley and the Poconos during the evening of the 26th. About 25,000 homes and businesses lost power in the area.
• Hail and Damaging Winds in New Hampshire, May 26, 20111.5 in hail · 12 eventsAn inverted trough set up over the region with rich low level moisture in place. This provided the focus for strong afternoon convection beginning to the southwest of the forecast area and moving northeast along the boundary into New Hampshire.
• Damaging Wind in Georgia, May 26, 201160 kt wind · 1 eventNumerous showers and thunderstorms affected the western Carolinas and northeast Georgia during the afternoon and evening hours. Some of the thunderstorms were severe, producing large hail and damaging straight line wind.
• Hail and Damaging Winds in South Carolina, May 26, 2011$8,000 · 1 in hail · 7 eventsScattered severe thunderstorms produced some large hail and wind damage.
• Hail and Damaging Wind in Georgia, May 26, 2011$4,000 · 1 in hail · 7 eventsScattered severe thunderstorms produced some large hail and wind damage.
• Damaging Winds in Georgia, May 26, 201150 kt wind · 3 eventsA short wave trough destabilized the atmosphere during the evening when the sea breezes merged across western SE Georgia. A few severe storms developed.
• Hail and Damaging Winds in New Jersey, May 26, 20111.5 in hail · 4 eventsA lee side trough helped trigger a line of strong to severe thunderstorms that moved through Warren and Hunterdon Counties during the evening of the 26th.
• Hail in Maine, May 26, 20111 in hail · 1 eventAn inverted trough set up over the region with rich low level moisture in place. This provided the focus for strong afternoon convection beginning to the southwest of the forecast area and moving northeast along the boundary into western Maine.
• Damaging Winds in New York, May 26, 201155 kt wind · 4 eventsAs a cold front moved southeast into a warm humid and unstable air mass, a line of severe thunderstorms developed and moved southeast across Orange County, New York. This line produced high winds that downed several trees, especially across western Orange County.
• Damaging Winds in Georgia, May 26, 2011$2,000 · 50 kt wind · 2 eventsAn upper level disturbance in combination with the Atlantic sea breeze, resulted in scattered thunderstorm development across southeast Georgia.
• 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.
• Damaging Winds in North Carolina, May 26, 2011$5,000 · 50 kt wind · 5 eventsCold pool driven convection moved off the higher terrain during the late evening hours and produced thunderstorm wind damage in Forsyth and Guilford Counties.
• Damaging Winds in Massachusetts, May 26, 201150 kt wind · 7 eventsA nearly stationary frontal boundary was draped across western and northern New York State as several waves of low pressure moved easterly along the boundary. In addition, a warm front lifted northeastward across the Berkshires during the morning hours of Thursday, May 26th.
• Damaging Winds in Vermont, May 26 to 30, 201150 kt wind · 5 eventsA nearly stationary frontal boundary was draped across western and northern New York State as several waves of low pressure moved easterly along the boundary. In addition, a warm front lifted northeastward across southern Vermont during the morning hours of Thursday, May 26th.
• Hail in Massachusetts, May 26, 20110.88 in hail · 1 eventA cold front stalled across northern New England acting as a focus for diurnal showers and thunderstorms. A few of these storms became severe.
• Hail in Ohio, May 26, 20110.88 in hail · 1 eventA warm front lifting northward across the area triggered strong thunderstorms across central Ohio during the evening of May 28th.
• Damaging Winds in New Hampshire, May 26, 2011$25,000 · 50 kt wind · 2 eventsA cold front stalled across northern New England acting as a focus for diurnal showers and thunderstorms. A few of these storms became severe.
• Damaging Winds and Heavy Rain in Georgia, May 27, 201150 kt wind · 6 eventsStacked troughing moved across the area during the afternoon when instability was high as the sea breezes fronts began to progress inland.
• Hail and Damaging Wind in South Carolina, May 27, 2011$1,000 · 50 kt wind · 2 eventsA shortwave moved across the area igniting scattered thunderstorms. These storms thrived along an inland trough and briefly pulsed to severe levels.
• 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.
• Hail and Damaging Winds in South Carolina, May 27, 2011$27,000 · 2 in hail · 9 eventsScattered severe thunderstorms developed over mainly the eastern half of the Midlands producing some large hail and damaging winds.
• Hail and Damaging Wind in Missouri, May 27, 2011$5,000 · 1 in hail · 11 eventsAn upper level disturbance interacted with a warm front across the Ozarks and produced several strong to severe storms.
• Hail in North Carolina, May 27, 2011$3,000 · 1.75 in hail · 3 eventsA shortwave moved across the area igniting scattered thunderstorms. These storms thrived along an inland trough and briefly pulsed to severe levels.
• Hail in Georgia, May 27, 20111 in hail · 4 eventsAn upper level disturbance in combination with the sea breeze and numerous convective outflow and differential heating boundaries, resulted in scattered thunderstorm development across southern South Carolina and southeast Georgia.
• Damaging Wind in North Carolina, May 27, 201150 kt wind · 1 eventThe area remained under the influence of an upper level trough and several passing upper level storm systems, helped trigger scattered thunderstorms. The strongest storm developed over Rockingham County, although wind damage was fairly isolated and confined to the Eden area.
• 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.
• Hail and Damaging Winds in Florida, May 27, 20111.75 in hail · 14 eventsStacked troughing moved across the area during the afternoon when instability was high as the sea breezes fronts began to progress inland.
• Hail and Damaging Winds in South Carolina, May 27 to 28, 2011$5,000 · 1 in hail · 5 eventsAn upper level disturbance in combination with the sea breeze and numerous convective outflow and differential heating boundaries, resulted in scattered thunderstorm development across southern South Carolina and southeast Georgia.
• Hail and Damaging Winds in Maryland, May 27, 2011$3,000 · 1.75 in hail · 9 eventsA warm and moist airmass remained over the region during the 27th. A surface trough provided the lifting mechanism for more showers and thunderstorms to develop. Copious amounts of instability caused some thunderstorms to become severe.
• Damaging Wind in Virginia, May 27, 201150 kt wind · 1 eventThe area remained under the influence of an upper level trough and several passing upper level storm systems, helped to trigger scattered thunderstorms. The strongest storm developed over Pittsylvania County.
• Hail in Washington, May 27 to 31, 2011$15,000 · 0.25 in hail · 3 eventsEastern Washington remained under an unstable weather pattern as two upper level storm systems pivoted around a broad long wave trough. The first wave approached the region on May 27th and exited into Montana on May 30th.
• Hail and Damaging Wind in North Carolina, May 27, 20111.75 in hail · 5 eventsThunderstorms developed over the North Carolina piedmont during the afternoon hours along a dissipating frontal boundary. A few of the storms produced large hail and damaging straight line winds.
• 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.
• Tornadoes and Flash Flood in Pennsylvania, May 27, 2011$120,000 · EF1 · 27 eventsSevere thunderstorms and tornadoes moved through the area. Two EF1 tornadoes were confirmed in Huntingdon County. There was one report of localized flash flooding in Bedford County.
• Tornado in Washington, May 27, 2011$10,000 · EF0 · 1 eventTornado with a peak wind speed estimated near 75 mph. Light to moderate damage to metal roofs on out buildings. Light damage to two houses - missing shingles and siding damage. Large branches snapped off several trees. Tornado estimated on the ground for less than 2 minutes.
• Hail and Damaging Winds in Vermont, May 27, 2011$24,000 · 1.75 in hail · 15 eventsA surface low as well as upper atmospheric energy traveled along a quasi-stationary boundary across northern Vermont during the afternoon of May 27th, the same system responsible for the May 26th severe storms and flash flooding.
• Hail and Damaging Winds in Maine, May 27, 20112.5 in hail · 9 eventsA stalled frontal boundary was again the focus for severe thunderstorms in northwest Maine. Large hail was the main feature with these storms although there were some reports of wind damage.
• 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.
• Hail in Florida, May 27, 20111 in hail · 2 eventsSeveral strong storms developed along the east and west coast sea breezes with two of them becoming severe and producing quarter sized hail. This occurred as an upper-level trough moved across the peninsula enhancing lift and mid to upper-level moisture.
• Hail and Damaging Winds in New York, May 27, 20111.75 in hail · 6 eventsA nearly stationary frontal boundary was draped across northern New York State. The airmass to the south of boundary was warm and humid. A disturbance moved easterly along the boundary Friday afternoon and evening, May 27th, triggering a round of thunderstorms.
• Tornadoes in North Dakota, May 27, 2011EF0 · 2 eventsA frontal boundary extended along a line from Langdon to Lisbon late in the afternoon of the 27th. With afternoon heating, strong instability developed across eastern North Dakota. One thunderstorm cell produced a tornado that touched down twice.
• Flash Flooding in West Virginia, May 27, 20112 eventsA nearly stationary front drifted east into the Potomac Highlands during the afternoon. Thunderstorms trained over the same area for several hours across locations that had saturated ground. Flash flooding resulted in Mineral County.
• Hail and Damaging Winds in New York, May 27, 2011$55,000 · 1.75 in hail · 21 eventsA frontal boundary sagged south across central New York and the atmosphere became moderately unstable south of the front. Showers and thunderstorms developed, with some storms producing large hail and damaging winds.
• Damaging Winds in Virginia, May 27, 2011$15,000 · 56 kt wind · 12 eventsA warm and moist airmass remained over the region during the 27th. A surface trough provided the lifting mechanism for more showers and thunderstorms to develop. Copious amounts of instability caused some thunderstorms to become severe.
• Hail in Maine, May 27, 20111.25 in hail · 3 eventsThunderstorms developed along a nearly stationary frontal boundary during the late afternoon and evening of the 27th. Several of the thunderstorms produced large hail across Piscataquis county.
• Hail in New Hampshire, May 27, 20111.5 in hail · 7 eventsA stalled frontal boundary was again the focus for severe thunderstorms across northern New Hampshire. Large hail was the main feature of these storms.
• Damaging Winds in South Carolina, May 28, 2011$7,000 · 55 kt wind · 3 eventsA few severe thunderstorms moved through the Pee Dee region and produced some wind damage and hail.
• Hail and Damaging Wind in Kansas, May 28, 2011$60,000 · 2 in hail · 4 eventsA nocturnal low level jet was the primary driving force to produce isolated thunderstorms before sunrise.
• Hail in Kansas, May 28, 20111.75 in hail · 2 eventsA stalled frontal boundary resulted in a few strong to severe thunderstorms across the southern two-thirds of Kansas during the predawn hours on the 28th. Hail up to golfball size was reported in Kingman county.
• Hail in Kansas, May 28, 20111 in hail · 1 eventAn isolated severe thunderstorm caused hail, in the early morning hours of May 28, 2011.
• Hail in Missouri, May 28, 2011$10,000 · 1.75 in hail · 5 eventsA warm front lifting northward across the Ozarks produced strong to severe storms which had large hail.
• Hail in Missouri, May 28, 20111.75 in hail · 9 eventsA warm front was lifting northward through forecast area. Severe storms developed along and north of the boundary. There were numerous reports of large hail with these storms.
• 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.
• Hail in Minnesota, May 28, 20111 in hail · 2 eventsSome late morning/early afternoon thunderstorms around the Lake of the Woods region produced large hail. As low pressure tracked toward the Lake of the Woods region in the evening, another thunderstorm dropped smaller hail near Thief River Falls.
• Hail in Illinois, May 28, 20114.5 in hail · 15 eventsA warm front was lifting northward through forecast area. Severe storms developed along and north of the boundary. There were numerous reports of large hail with these storms.
• Hail and Lightning Strike in Illinois, May 28, 2011$20,000 · 1.75 in hail · 21 eventsA warm front lifting northward into central Illinois triggered numerous supercell thunderstorms during the afternoon of May 28th. Many of the storms produced large hail, with stones as large as golfballs being reported across parts of Morgan, Sangamon, and Coles counties.
• Damaging Wind in Delaware, May 28, 201150 kt wind · 1 eventThunderstorms formed along the sea breeze front on the Delmarva Peninsula during the afternoon of the 28th, one of which became severe in Sussex County.
• Tornado and Hail in Minnesota, May 28, 2011EF0 · 18 eventsThunderstorms developed Saturday afternoon along an area of drier air moving across western Minnesota, and into eastern Minnesota. A few storms began severe in the southwest suburbs of the Twin Cities, with a brief tornado touchdown near Gaylord.
• Tornado and Hail in Minnesota, May 28, 2011EF0 · 20 eventsDespite surface temperatures only being in the 60s, with dew points in the 40s ahead of an approaching surface cold front, a pocket of cold air aloft associated with an upper level low generated enough instability to support thunderstorms.
• Hail in South Carolina, May 28, 20111 in hail · 2 eventsThe sea breeze in combination with numerous outflow and differential heating boundaries, resulted in scattered thunderstorm development across southern South Carolina.
• Hail in Illinois, May 28, 20111 in hail · 2 eventsSome showers and a few thunderstorms developed across parts of west central Illinois during the afternoon of May 28. By mid afternoon a severe storm affected Kirkwood, IL producing copious amounts of dime to quarter sized hail.
• Hail and Damaging Wind in South Carolina, May 28, 2011$8,000 · 1.75 in hail · 6 eventsA cluster of thunderstorms merged into one large thunderstorm that pulsed up to severe levels several times as it moved into an area of higher instability.
• Hail in Indiana, May 28, 20111.5 in hail · 5 eventsStorms near a warm front during the evening of May 28th dropped hail up to ping pong ball size.
• 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.
• Hail in Florida, May 28, 20110.88 in hail · 1 eventAn isolated storm produced nickel sized hail and gusty winds as the east and west coast sea breezes collided.

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.