North Central Severe Weather

Losses, 2024 dollars

$1.5 billion

Losses at the time

$1.3 billion

Deaths

2

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.

• Tornado and Damaging Winds in Missouri, August 8, 2021$66,000 · EF0 · 4 eventsA line of intense thunderstorms tracked eastward ahead of a mid-level short wave trough progressing into the middle Mississippi Valley. The storms were located within a corridor of unstable air characterized by cape in excess of 2000 J/kg.
• Flash Flooding and Damaging Winds in Arizona, August 8, 2021$11,000 · 56 kt wind · 5 eventsScattered thunderstorms developed during the afternoon and moved west or southwest across southeast Arizona into the evening. The strongest storms produced damaging winds and flash flooding in the Dragoon and St. David areas.
• Flash Flooding and Heavy Rain in Iowa, August 8 to 9, 20214 eventsSeveral rounds of thunderstorms with heavy rain moved across portions of northeast Iowa during the evening of August 8th into the early morning of the 9th. Radar estimates indicated that 4 to 6 inches of rain fell across southeast Floyd County into southwest Chickasaw County.
• Damaging Wind in Missouri, August 8, 202150 kt wind · 1 eventAn upper-level trough moved across northern Arkansas and the Missouri Bootheel. This trough spawned a severe thunderstorm which caused some property damage.
• Tornadoes in Iowa, August 8, 2021$4,000 · 9 eventsFive tornadoes occurred in Webster county during the late evening hours as a lone supercell moved southeast. They tornadoes remained in rural areas with damage confined to crops.
• Flash Flood in Illinois, August 9, 2021$10,000 · 1 eventRepeating rounds of showers and thunderstorms produced isolated flash flooding of roads. A 30 to 40 knot west-southwest wind flow in the lower levels of the atmosphere was responsible for strong transport of moisture and instability.
• Damaging Winds in Michigan, August 9, 2021$18,000 · 50 kt wind · 3 eventsA weak wave progressing over the Great Lakes helped support convective initiation in the open warm sector across northern Michigan during the afternoon. A few of these storms produced damaging wind gusts across parts of the area.
• Damaging Winds in Michigan, August 9, 202154 kt wind · 5 eventsA few severe thunderstorms downed trees over Oakland, Macomb, and St. Clair Counties.
• Damaging Wind in Delaware, August 9, 202150 kt wind · 1 eventIsolated thunderstorms developed in a warm and unstable air mass. Impacts were limited, but a couple of storms became strong to severe.
• Flash Flooding in Delaware, August 9, 20212 eventsThunderstorms produced locally heavy rain in central Delaware on the afternoon of August 9. Rainfall totals were up to 2 to 4 inches.
• Hail and Damaging Winds in Kentucky, August 9 to 13, 20211 in hail · 5 eventsDuring a warm unsettled summer pattern with temperatures in the upper 90s, scattered afternoon and evening thunderstorms produced isolated wind damage over multiple days.
• Tornado in Wisconsin, August 9, 2021EF0 · 1 eventA round of thunderstorms develop along a weak front that was moving through the region and produced a tornado in Rock County.
• Tornadoes and Flooding in Illinois, August 9, 2021EF1 · 13 eventsScattered thunderstorms produced heavy rain and flooding across portions of northern Illinois during the morning and afternoon of August 9th. Additional thunderstorms in the afternoon and evening produced several tornadoes.
• Damaging Winds in West Virginia, August 9, 2021$3,000 · 3 eventsAn upper level disturbance moving across West Virginia led to scattered showers and thunderstorms throughout the region. During the late afternoon on August 9th, a non-severe thunderstorm led to a few isolated trees to be blown down in Kanawha County.
• Damaging Wind in Tennessee, August 9, 202152 kt wind · 1 eventA few storms moved across the northern Cumberland Plateau in the afternoon. One storm intensified and blew down trees near Sunbright.
• Hail in North Dakota, August 9, 2021$550,000 · 3 in hail · 12 eventsThunderstorms developed along a surface trough over north-central North Dakota into the James River Valley region. Some of these storms produced very large hail in an environment of elevated instability and strong deep layer shear.
• Damaging Winds in Maryland, August 9, 2021$11,000 · 50 kt wind · 3 eventsA cluster of thunderstorms produced a few downbursts from Northeast DC into nearby adjacent metro Maryland and over southeastern Anne Arundel County.
• Damaging Wind in District of Columbia, August 9, 2021$1,000 · 50 kt wind · 1 eventA cluster of thunderstorms produced a few downbursts from Northeast DC into nearby adjacent metro Maryland and over southeastern Anne Arundel County.
• Flash Flood and Damaging Winds in California, August 9 to 13, 2021$2,000 · 56 kt wind · 4 eventsMonsoon moisture fueled thunderstorms over the Mojave Desert, many of which produced severe winds and flash flooding.
• Hail and Damaging Wind in Nebraska, August 9, 20211 in hail · 2 eventsOn this late Monday afternoon and evening, a smattering of high-based thunderstorms affected mainly far west-central and northern portions of South Central Nebraska...particularly Dawson, Sherman, Valley and Greeley counties.
• Tornadoes and Hail in North Dakota, August 9, 2021$199,000 · EF2 · 39 eventsSevere thunderstorms formed during the late afternoon and early evening, extending into the overnight period. Damaging wind gusts, large hail, and tornadoes were all reported through the course of the event.
• Hail and Damaging Wind in Tennessee, August 9, 2021$15,000 · 52 kt wind · 2 eventsScattered showers and thunderstorms developed around midday on August 9th. There was one isolated hail report in Smith County, and one damaging wind report from Cumberland County.
• Tornadoes and Damaging Wind in Illinois, August 9, 2021EF1 · 5 eventsSevere thunderstorms developed across all of northern and northwest Illinois on the evening of August 9, 2021.
• Flash Flood in Arizona, August 9, 20211 eventMonsoon moisture returning to northern Arizona caused thunderstorms to develop over the Prescott area. A storm dropped enough rain to cause a flash flood on Lynx Creek.
• Flash Flooding and Flood in Maryland, August 9, 20214 eventsThunderstorms produced isolated instances of flash flooding in Prince Georges and Montgomery Counties.
• Damaging Wind in New Mexico, August 9, 202158 kt wind · 1 eventA broad upper level ridge was over Southeast New Mexico. Moisture was fairly high across the area and lift was enhanced by the Guadalupe and Delaware Mountains. Moisture was limited in the middle levels of the atmosphere so storm development allowed for strong, gusty winds.
• Hail and Damaging Wind in Kansas, August 9, 20211 in hail · 2 eventsDuring the late afternoon and evening hours, discrete supercells developed along a boundary stretching across the Colorado border, Northwest Kansas, and extreme Southwest Nebraska.
• Damaging Winds in Nebraska, August 9, 202153 kt wind · 2 eventsA line of thunderstorms developed across portions of southwest into central Nebraska in the evening. A few thunderstorms were severe across far southwest Nebraska and portions of central Nebraska.
• Tornadoes and Damaging Winds in Minnesota, August 9, 2021$136,000 · EF1 · 5 eventsSevere thunderstorms formed during the late afternoon and early evening in eastern North Dakota, moving into west-central and northwest Minnesota during the mid to late evening. Damaging wind gusts, large hail, and tornadoes were all reported through the course of the event.
• Flash Flood in Michigan, August 10, 2021$1.3 million · 1 eventOn the night of August 9, storms moved in from Lake Michigan. These storms began to train and 2.5 to 7 inches of rain was reported in Berrien County.
• Hail and Damaging Winds in Kansas, August 10, 202155 kt wind · 4 eventsThe very early morning hours on this Tuesday were somewhat active, as a small complex of strong to severe thunderstorms rumbled from west-to-east through the heart of this six-county North Central Kansas area mainly between 12:30-4:00 a.m. CDT.
• Flash Flooding in New Jersey, August 10, 20212 eventsThunderstorms produced locally heavy rain in northern Burlington County during the early hours of August 10. Rainfall totals were up to 2 to 4 inches.
• Hail in Kansas, August 10, 20211 in hail · 3 eventsSeveral rounds of storms developed within a 24 hour period across the area, with some producing hail.
• Flash Flooding and Damaging Wind in Arizona, August 10 to 12, 2021$419,000 · 56 kt wind · 15 eventsMultiple rounds of thunderstorms developed and drifted slowly across southeast Arizona from the early morning hours of August 10 through the late night/early morning hours of August 12.
• Hail and Damaging Wind in Missouri, August 10 to 11, 20211 in hail · 2 eventsIn what was the beginning of an active pattern across the area, scattered thunderstorms formed on August 10 and 11, producing a few instances of severe weather. This severe weather was isolated and generally low impact.
• Flash Flooding in Arizona, August 10, 20212 eventsIn a moisture rich environment, with above normal PWATs and high mixing ratios, slow-moving thunderstorms in the the morning of the 10th produced very heavy rainfall, with rain rates upwards of 2 to 2.5 inches per hour, leading to localized flash flooding in parts of Maricopa…
• Lightning Strike in Wisconsin, August 10, 20214 injured · 1 eventThunderstorms developed during the morning hours of the 10th ahead of a northward moving warm front. One of these storms developed over a golf course and four golfers were struck by lightning just before 11:30AM.
• Hail and Damaging Winds in Virginia, August 10, 2021$48,000 · 1 in hail · 14 eventsAn unstable, hot, and humid environment interacted with a deep upper trough in the Mid-Atlantic to create several severe thunderstorms.
• Hail in Wisconsin, August 10, 20211 in hail · 2 eventsA few elevated thunderstorms developed ahead of an approaching cold front the morning of the 10th.
• Hail and Damaging Winds in Iowa, August 10, 20211 in hail · 5 eventsAn upper level low moved across the area with an attendant frontal boundary that stalled out across the state. The air mass south of the boundary was extremely hot an humid with heat indices soaring over 105 degrees.
• Damaging Winds in Pennsylvania, August 10, 2021$41,000 · 61 kt wind · 9 eventsSeveral rounds of scattered thunderstorms developed in a low shear, moderate CAPE, high DCAPE environment. The first round developed as scattered convection in southwest PA on the previous night and crossed into central PA by 11 AM EDT on Aug 10.
• Hail and Damaging Winds in Virginia, August 10, 2021$154,000 · 1.75 in hail · 20 eventsA lee pressure trough ignited thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe downbursts and sporadic hail.
• Hail and Damaging Winds in Michigan, August 10, 2021$43,000 · 2.75 in hail · 12 eventsA vigorous wave moving across a moist and unstable airmass produced thunderstorms with large hail over portions of west and central Upper Michigan on the 10th.
• Hail and Damaging Winds in Georgia, August 10 to 11, 2021$75,000 · 1 in hail · 14 eventsDespite weak high pressure across the region at the surface and aloft, ample moisture and strong daytime heating produced widespread thunderstorms across north and central Georgia each afternoon into the evening along with scattered strong to severe thunderstorms.
• Damaging Winds in North Carolina, August 10, 20213 injured · $20,000 · 50 kt wind · 2 eventsAn unstable, hot, and humid environment interacted with a deep upper trough in the Mid-Atlantic to create several severe thunderstorms.
• Flash Flooding and Dust Storm in California, August 10 to 11, 2021$30,000 · 50 kt wind · 16 eventsA mesoscale convective system (organized thunderstorms) producing a dust storm (haboob) in the Imperial Valley, Salton Sea and Borrego deserts on the evening of August 10th. Visibility was reported as low as 1/2 mile to 1 mile observed.
• Damaging Winds in Pennsylvania, August 10, 202150 kt wind · 24 eventsA hot and humid air mass was in place over the mid-Atlantic on August 10. A lee side surface trough was present over central Pennsylvania.
• Damaging Winds in Virginia, August 10, 2021$10,000 · 50 kt wind · 9 eventsScattered severe thunderstorms associated with a surface trough produced damaging winds across portions of central Virginia.
• Damaging Winds in Iowa, August 10, 2021$33,000 · 50 kt wind · 6 eventsAn area of storms rolled across portions of northeast Iowa during the afternoon of August 10th and caused some wind damage.
• Damaging Winds in Iowa, August 10, 202161 kt wind · 9 eventsSevere thunderstorms developed across portions of eastern Iowa and northwest Illinois on the afternoon of Tuesday, August 10 2021. Storms produced mainly damaging winds in an environment with plentiful instability, with a gust estimated at 70 MPH occurring in Linn County.
• Flash Flood and Damaging Winds in Alabama, August 10, 202155 kt wind · 3 eventsOnly a few storms developed across Central Alabama during the afternoon of August 10th, but the atmosphere was primed for damaging winds.
• Damaging Winds in West Virginia, August 10, 2021$3,000 · 50 kt wind · 3 eventsA lee pressure trough ignited thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe downbursts and sporadic hail.
• Damaging Winds and Lightning Strikes in Maryland, August 10, 2021$2.6 million · 57 kt wind · 18 eventsA lee pressure trough ignited thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe downbursts and sporadic hail.
• Damaging Winds in Tennessee, August 10, 202152 kt wind · 5 eventsAfternoon thunderstorms developed near the Cumberland Plateau and tracked east across the southern half of the Tennessee Valley through the evening. Several of these storms produced damaging wind gusts.
• Damaging Wind in Ohio, August 10, 2021$1,000 · 1 eventAn upper level disturbance crossed to the north of the Ohio Valley on August 10th leading to isolated showers and thunderstorms that afternoon and evening. During the afternoon, a non-severe thunderstorm led to a tree being blown down in Lawrence County.
• Damaging Winds in Wisconsin, August 10, 2021$8,000 · 63 kt wind · 5 eventsAn area of thunderstorms moved across parts of southwest Wisconsin during the afternoon of August 10th. These storms produced a wind gust of 70 mph at the Platteville (Grant County) airport and a 72 mph gust was measured by the fire department in Livingston (Grant County).
• Damaging Winds in New Jersey, August 10, 202150 kt wind · 3 eventsA hot and humid air mass was in place over the mid-Atlantic on August 10. A lee side surface trough was present over central Pennsylvania.
• Damaging Wind in West Virginia, August 10, 2021$1,000 · 1 eventAn upper level disturbance crossed to the north of the Ohio Valley on August 10th leading to isolated showers and thunderstorms during the afternoon and evening. A non-severe thunderstorm blew down a tree in Tyler County during the late afternoon.
• Damaging Wind in District of Columbia, August 10, 2021$20,000 · 50 kt wind · 1 eventA lee pressure trough ignited thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe downbursts and sporadic hail.
• Damaging Winds in Wisconsin, August 10, 2021$272,000 · 67 kt wind · 14 eventsA complex of storms moved out of Iowa and into southern and central Wisconsin on August 10th. This complex morphed into a line of strong to severe thunderstorms, which marched eastward and gained strength as it approached Lake Michigan.
• Flash Flooding and Dust Storm in Arizona, August 10 to 14, 2021$20,000 · 52 kt wind · 14 eventsMonsoon moisture fueled thunderstorms over the Mojave Desert, many of which produced severe winds and flash flooding.
• Tornado and Hail in Kansas, August 10, 2021EF0 · 16 eventsIsolated storms developed from from Meade to Hodgeman Counties producing damaging winds and isolated hail reports along the frontal boundary draped across this area. CIN initially capped the environment but soon broke as the boundary pushed further west.
• Flash Flood in Arizona, August 10, 20211 eventIncreasing moisture and clearing skies lead to the development of thunderstorms that produced heavy rain and flash flooding over Yavapai County.
• Tornado in Florida, August 10, 2021$10,000 · EF0 · 1 eventTornado briefly touches down in Pasco County during afternoon storms.
• Damaging Winds in Illinois, August 10, 202165 kt wind · 3 eventsSevere thunderstorms developed across portions of eastern Iowa and northwest Illinois on the afternoon of Tuesday, August 10 2021. Storms produced mainly damaging winds in an environment with plentiful instability, with a gust estimated at 70 MPH occurring in Linn County.
• Damaging Winds in South Carolina, August 10, 2021$10,000 · 50 kt wind · 4 eventsScattered thunderstorms developed near the Blue Ridge during the late afternoon and evening and drifted southeast over the foothills and Piedmont. A few of these produced brief damaging wind gusts.
• Tornado and Flood in Illinois, August 10, 202160 kt wind · 51 eventsScattered severe thunderstorms moved across northern Illinois on August 10th.
• Damaging Winds in Florida, August 10 to 14, 202150 kt wind · 2 eventsA typical summertime pattern prevailed with scattered afternoon thunderstorms in a favorable environment for occasional downbursts with gusty winds. A couple of reports of wind damage were received.
• Tornado and Flash Flood in Wisconsin, August 10, 2021$5,000 · EF1 · 7 eventsThunderstorms developed ahead of an outflow boundary during the evening hours across east-central Wisconsin. The strongest storms produced damaging winds and a tornado. Rainfall amounts around 2 inches fell in Green Bay, producing flash flooding.
• Damaging Wind in Ohio, August 10, 202156 kt wind · 1 eventStorms during the evening produced wind damage.
• Damaging Winds in Alabama, August 10 to 14, 2021$12,000 · 55 kt wind · 6 eventsA typical summertime pattern prevailed with scattered afternoon thunderstorms in a favorable environment for occasional downbursts with gusty winds. A few reports of wind damage were received.
• Hail and Damaging Winds in Kansas, August 10, 2021$55,000 · 1.75 in hail · 12 eventsAn isolated supercell thunderstorm produced large hail, up to golf ball size, and damaging wind gusts, of 60 to 77 mph across portions of central Kansas on August 10th, 2021.
• Hail in Kansas, August 10, 2021$6.4 million · 2.75 in hail · 4 eventsAlthough it only clipped a small portion of this six-county North Central Kansas area, a lone-but-intense severe storm tracked northeastward across far southeastern Osborne County and roughly the southeast half of Mitchell County on this Tuesday evening, prompting several…
• Flash Flooding and Damaging Winds in Arizona, August 10, 2021$42,000 · 56 kt wind · 6 eventsAn MCS developed in the afternoon in Yavapai and Mohave counties and spread southwest through La Paz and Yuma counties through the evening and early overnight hours.
• Damaging Winds in Indiana, August 10, 202160 kt wind · 4 eventsScattered severe thunderstorms moved across portions of northwest Indiana on August 10th.
• Damaging Winds in Indiana, August 10 to 11, 2021$5,000 · 61 kt wind · 12 eventsStorms during the evening produced wind damage across north-central Indiana and southwest Michigan. Then a line of strong storms moved through overnight that produced some damaging wind across Allen County, Indiana.
• Damaging Winds in Michigan, August 10, 2021$3,000 · 61 kt wind · 8 eventsStorms during the evening produced wind damage across north-central Indiana and southwest Michigan.
• Damaging Winds in Michigan, August 10, 2021$230,000 · 64 kt wind · 9 eventsThere were numerous reports of severe thunderstorm wind gusts in the 60 to 75 mph range that brought down numerous trees, tree limbs and power lines across southwestern lower Michigan.
• Flash Flooding and Hail in Michigan, August 10 to 11, 20211 injured · $392,000 · 51 kt wind · 16 eventsAfter a warm front mixed northward across northern Michigan during the day, a weak shortwave progressing overhead helped initiate storms along a weak boundary over Lake Michigan.
• Flash Flooding and Dust Storm in California, August 10 to 11, 20211 injured · $26,000 · 6 eventsAn MCS developed in the afternoon in western Arizona and spread southwest through Riverside and Imperial counties during the evening and early overnight hours.
• Damaging Winds in Michigan, August 10, 202160 kt wind · 4 eventsA few severe thunderstorms impacted areas north of I-69.
• Hail and Damaging Winds in Ohio, August 11 to 13, 202165 kt wind · 57 eventsNorthern Ohio was within the warm sector during the morning of the 11th through early evening of the 13th as the region remained along the northwestern flank of the Bermuda-Azores subtropical high pressure ridge.
• Damaging Winds in Ohio, August 11, 2021$56,000 · 51 kt wind · 23 eventsA complex of thunderstorms moved east across areas along and north of Interstate 70, mainly during the afternoon hours.
• Damaging Winds in New York, August 11, 2021$23,000 · 53 kt wind · 18 eventsA mesoscale convective system exited Lower Michigan into Lake Huron in the early morning hours. In a very unstable air mass ahead of this feature, and along a warm frontal segment over Lake Erie, scattered convection developed over Lake Erie.
• Flash Flooding and Flood in Arizona, August 11 to 13, 2021$255,000 · 56 kt wind · 19 eventsAn upper level low sitting over central Arizona on the 11th and 12th led to the development of multiple rounds of showers and thunderstorms across the region.
• Flash Flooding and Hail in Iowa, August 11, 20211 in hail · 4 eventsA cluster of strong thunderstorms formed in northeast Missouri early in the morning, August 11th, 2021. These storms expanded and moved northeast into northern Illinois, with a swath of damaging winds, hail, and very heavy rainfall.
• Hail and Damaging Winds in Illinois, August 11, 20211 in hail · 10 eventsA cluster of strong thunderstorms formed in northeast Missouri early in the morning, August 11th, 2021. These storms expanded and moved northeast into northern Illinois, with a swath of damaging winds, hail, and very heavy rainfall.
• Damaging Winds in Illinois, August 11, 20211 death · 2 injured · 70 kt wind · 59 eventsA line of severe thunderstorms moved across northern Illinois during the late morning of August 11th producing wind damage in many areas. Winds gusted to near severe limits for as much as 20 minutes in some areas behind the line of storms.
• Flash Flooding and Flood in West Virginia, August 11, 2021$22,000 · 4 eventsAn upper level disturbance crossed West Virginia on August 11th leading to showers and thunderstorms moving through that morning.
• Tornadoes and Damaging Winds in Wisconsin, August 11, 2021$12,000 · EF0 · 4 eventsSupercell thunderstorms developed over western and southwestern Wisconsin in the afternoon on August 11th. They continued to move east into southern Wisconsin, bringing a few tornadoes and damaging winds.
• Damaging Winds in Indiana, August 11, 202152 kt wind · 3 eventsA line of severe thunderstorms moved across portions of northwest Indiana during the late morning and early afternoon of August 11th.
• Damaging Winds and Lightning Strike in Indiana, August 11, 2021$245,000 · 61 kt wind · 46 eventsConvection initiated in Central Illinois and developed into a convective line as it approached Indiana. Thunderstorms developed in the warm sector ahead of the initial line and produced multiple outflow interactions.
• Damaging Winds in Michigan, August 11, 2021$99,000 · 61 kt wind · 10 eventsConvection initiated in Central Illinois and developed into a convective line as it approached Michigan. Thunderstorms developed in the warm sector ahead of the initial line and produced multiple outflow interactions.
• Tornado and Damaging Winds in Michigan, August 11, 2021$485,000 · EF0 · 9 eventsSevere storms produced numerous reports of wind gusts up to around 60 mph that brought down numerous trees and tree limbs. In addition an EF-0 tornado struck near Dorr in Allegan county.
• Tornadoes and Flash Flood in Wisconsin, August 11, 2021$10,000 · EF0 · 12 eventsThunderstorms developed ahead of a cold front during the afternoon across northeast Wisconsin. The strongest storms produced wind damage, large hail and 2 tornadoes.
• Tornadoes and Damaging Winds in Ohio, August 11, 2021EF1 · 24 eventsConvection initiated in Central Illinois and developed into a convective line as it approached Indiana. Thunderstorms developed in the warm sector ahead of the initial line and produced multiple outflow interactions.
• Hail and Damaging Winds in Virginia, August 11, 2021$247,000 · 1.75 in hail · 39 eventsA lee pressure trough and weak cold front combined to ignite numerous thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe wind gusts and sporadic hail.
• Tornadoes and Flooding in Wisconsin, August 11 to 14, 2021$60,000 · EF1 · 6 eventsTwo tornadoes touched down in Monroe County as storms moved across western Wisconsin during the afternoon of August 11th. The first tornado touched down north of Norwalk (Monroe County) and moved east for six miles destroying a barn and causing tree and crop damage.
• Damaging Winds in Virginia, August 11, 2021$29,000 · 55 kt wind · 9 eventsAn upper level trough passing over the Mid-Atlantic provided the large scale forcing needed to form storms in a warm and humid air mass. CAPE values above 1500 J/kg and DCAPE values above 500 J/kg led to storms with strong outflows that produced damaging winds.
• Damaging Winds in Michigan, August 11, 2021$7,000 · 60 kt wind · 2 eventsSevere thunderstorms moved through south-central Upper Michigan on the afternoon of the 11th.
• Damaging Winds in West Virginia, August 11, 2021$9,000 · 50 kt wind · 6 eventsA lee pressure trough and weak cold front combined to ignite numerous thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe wind gusts and sporadic hail.
• Flash Flood and Damaging Winds in Pennsylvania, August 11, 2021$90,000 · 52 kt wind · 19 eventsA strengthening line of showers and storms pushed into central Pennsylvania from the west during the afternoon of August 11, 2021. At the same time, discreet cells developed over the Lower Susquehanna Valley, well ahead of the main line.
• Damaging Wind in Indiana, August 11, 2021$25,000 · 55 kt wind · 1 eventNumerous early afternoon convective cells over north-central central Indiana quickly transformed into a strong squall line over northeastern central Indiana, which produced damaging winds.
• Flash Flooding and Damaging Winds in Michigan, August 11 to 12, 2021$100,000 · 65 kt wind · 35 eventsTwo rounds of thunderstorms impacted Southeastern Michigan on August 11: the first during the afternoon and the second during the late evening into the following morning.
• Damaging Winds and Lightning Strike in Maryland, August 11, 20211 death · 1 injured · $946,000 · 65 kt wind · 26 eventsA lee pressure trough and weak cold front combined to ignite numerous thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe wind gusts and sporadic hail.
• Damaging Winds in North Carolina, August 11, 2021$11,000 · 50 kt wind · 3 eventsAn upper level trough passing over the Mid-Atlantic provided the large scale forcing needed to form storms in a warm and humid air mass. CAPE values above 1500 J/kg and DCAPE values above 500 J/kg led to storms producing damaging winds.
• Tornado and Damaging Winds in Michigan, August 11, 20211 injured · $103,000 · EF0 · 19 eventsA seasonably strong shortwave rotated over the Great Lakes to produce a second round of severe thunderstorms across all of northern Michigan during the afternoon and evening of 8/11.
• Hail and Damaging Wind in Georgia, August 11, 20211 in hail · 2 eventsScattered thunderstorms developed across northeast Georgia throughout the afternoon. A couple of the storms produced brief large hail and damaging wind gusts.
• Flash Flood and Damaging Winds in North Carolina, August 11, 2021$6,000 · 50 kt wind · 7 eventsScattered thunderstorms developed across western North Carolina throughout the afternoon into the evening. Several of the storms produced brief damaging wind gusts in the Piedmont.
• Damaging Winds in New York, August 11, 202150 kt wind · 6 eventsAmid a hot and humid air mass, scattered showers and thunderstorms passed across portions of eastern New York, mainly during the afternoon and evening hours.
• Damaging Winds in Tennessee, August 11, 202152 kt wind · 7 eventsScattered summer time afternoon thunderstorms produced damaging wind gusts in parts of East Tennessee.
• Damaging Winds in Virginia, August 11, 2021$31,000 · 50 kt wind · 11 eventsScattered severe thunderstorms associated with a surface trough produced damaging winds across central Virginia.
• Damaging Wind in Vermont, August 11, 2021$2,000 · 50 kt wind · 1 eventA weak trough moved through a marginally unstable airmass across NY/VT during the later afternoon of August 11th. Scattered thunderstorms developed along this trough axis across the Champlain Valley of NY into VT.
• Flash Flooding and Damaging Winds in Mississippi, August 11 to 14, 2021$8,000 · 50 kt wind · 4 eventsAfternoon showers and storms developed in a moist airmass. Some of these storms produced efficient rainfall and moved slowly, which resulted in localized flash flooding. Gusty winds also produced localized wind damage in some locations.
• Damaging Winds in Pennsylvania, August 11, 202155 kt wind · 13 eventsVery similar to the prior day, a hot and humid air mass was present over the mid-Atlantic on August 11. A lee side surface trough over Pennsylvania again allowed thunderstorms to develop near peak heating.
• Hail and Damaging Winds in Pennsylvania, August 11 to 13, 20211.75 in hail · 11 eventsNorthwest Pennsylvania was within the warm sector during the morning of the 11th through early evening of the 13th as the region remained along the northwestern flank of the Bermuda-Azores subtropical high pressure ridge.
• Damaging Winds in New York, August 11, 2021$5,000 · 52 kt wind · 2 eventsA low pressure trough in a warm and humid air mass triggered severe thunderstorms across the Southeastern New York.
• Damaging Wind in South Carolina, August 11, 202150 kt wind · 1 eventScattered thunderstorms developed across upstate South Carolina throughout the late afternoon and evening. One of the storms produced brief damaging wind gusts in Cherokee County.
• Tornado in Iowa, August 11, 2021EF0 · 1 eventA cluster of strong storms formed in northeast Iowa the afternoon of August 11, 2021. On particularly strong storms moved through Delaware and Dubuque counties, which produced a brief EF0 tornado.
• Damaging Wind in Alabama, August 11, 2021$300 · 1 eventScattered to numerous thunderstorms developed during the afternoon hours, primarily over north central into northeast Alabama. A tree was knocked down by one of the storms in Jackson County.
• Damaging Winds in New Jersey, August 11, 202150 kt wind · 7 eventsVery similar to the prior day, a hot and humid air mass was present over the mid-Atlantic on August 11. A lee side surface trough over Pennsylvania again allowed thunderstorms to develop near peak heating.
• Flash Flood and Damaging Winds in Nevada, August 11 to 12, 2021$2,000 · 76 kt wind · 5 eventsMonsoon moisture fueled thunderstorms over the Mojave Desert, many of which produced severe winds and flash flooding.
• Damaging Winds in New Jersey, August 11, 2021$3,000 · 52 kt wind · 2 eventsA low pressure trough in a warm and humid air mass triggered severe thunderstorms across Northeastern New Jersey.
• Hail in Tennessee, August 11, 20211 in hail · 1 eventScattered showers and thunderstorms developed in the afternoon hours on August 11th. There was one isolated hail report in Bedford County.
• Flash Flood in Arizona, August 11, 20211 eventAnother round of thunderstorms caused flash flooding in the Prescott area for the second day in a row.
• Flash Flood in New Mexico, August 11, 20211 eventA weak shortwave trough was moving out of southeast Arizona and with weak flow at the low and mid levels, slow moving storms developed and heavy rain produced some flash flooding along Highway 9 west of Columbus.
• Hail and Damaging Wind in Kansas, August 11, 2021$15,000 · 87 kt wind · 2 eventsDuring the evening hours, discrete supercell thunderstorms developed across Southwest Kansas.
• Damaging Winds in Illinois, August 11 to 12, 202165 kt wind · 5 eventsScattered thunderstorms moved across portions of northern Illinois during the late evening of August 11th into the early morning of August 12th producing scattered wind damage.
• Damaging Winds in Indiana, August 12, 2021$15,000 · 61 kt wind · 18 eventsStorms moved across the area during the early morning of 8/12. Initial disorganized storms evolved into two distinct, organized multi-cell clusters. One tracking from Bristol ENE through Middlebury, Constantine, Sturgis, Coldwater, Jonesville, HIllsdale and Moscow.
• Damaging Winds in Michigan, August 12, 2021$58,000 · 61 kt wind · 17 eventsStorms moved across the area during the early morning of 8/12. Initial disorganized storms evolved into two distinct, organized multi-cell clusters. One tracking from Bristol ENE through Middlebury, Constantine, Sturgis, Coldwater, Jonesville, HIllsdale and Moscow.
• Damaging Winds in Michigan, August 12, 2021$250,000 · 52 kt wind · 2 eventsSevere storms produced damaging wind gusts and heavy rain across portions of Jackson county during the early morning hours of August 12th.
• Damaging Wind in Ohio, August 12, 202161 kt wind · 1 eventStorms moved across the area during the early morning of 8/12. Initial disorganized storms evolved into two distinct, organized multi-cell clusters. One tracking from Bristol ENE through Middlebury, Constantine, Sturgis, Coldwater, Jonesville, HIllsdale and Moscow.
• Hail in Iowa, August 12, 20211 in hail · 1 eventA cluster of strong storms moved through southeast Iowa, with heavy rain and one report of quarter size hail.
• Flash Flood and Flood in Illinois, August 12 to 13, 2021$12 million · 1 in hail · 4 eventsMultiple thunderstorms produced torrential rain across southern Ford County during the late morning and early afternoon of August 12th producing flash flooding and significant flood damage in Gibson City.
• Flash Flooding and Hail in Illinois, August 12, 20211 in hail · 26 eventsA nearly stationary frontal boundary interacting with a moist environment triggered numerous clusters of strong to severe thunderstorms across north-central Illinois during the morning of August 12th.
• Hail in Missouri, August 12, 20210.88 in hail · 1 eventAugust 12, strong storms moved through northeast Missouri during the morning hours. Heavy rain and nickel size hail was reported in the strongest storms.
• Flash Flooding and Flood in Pennsylvania, August 12 to 13, 2021$25,000 · 55 kt wind · 60 eventsRemnants of mesoscale convective systems over the Great Lakes advanced into the Ohio River Valley throughout the day on August 12th and helped to create severe storms.
• Damaging Winds in Pennsylvania, August 12, 20212 injured · $95,000 · 52 kt wind · 25 eventsA broken line of showers and storms developed in a warm and very humid airmass to the south of a weak stationary front over southern New York state during the afternoon and evening of August 12, 2021.
• Flash Flood in Iowa, August 12, 20213 eventsA slow moving boundary across southern Iowa provided the impetus for training storms along the Iowa Missouri border. Several inches of rain fell and resulted in flash flooding in Appanoose county.
• Damaging Winds and Lightning Strike in New York, August 12, 2021$20,000 · 50 kt wind · 13 eventsThe continuation of a hot and humid air mass caused the development of another batch of showers and thunderstorms during the afternoon hours across eastern New York, mainly impacting the Capital District. Damaging wind gusts knocked down trees and power lines as a result.
• Hail and Damaging Winds in North Carolina, August 12, 2021$35,000 · 1.75 in hail · 10 eventsAn upper level storm system passing over the area combined with a humid airmass to generate scattered thunderstorms. Some of these storms became severe producing damaging winds and large hail.
• Damaging Winds and Lightning Strikes in Pennsylvania, August 12, 2021$116,000 · 50 kt wind · 13 eventsHot and humid conditions helped create an unstable environment during the afternoon hours. Storms triggered along a passing disturbance as it moved through Northeastern Pennsylvania with many storms becoming severe.
• Damaging Winds in Virginia, August 12, 2021$10,000 · 50 kt wind · 8 eventsAn upper level storm system passing over the area combined with a humid airmass to generate scattered thunderstorms. Some of these storms became severe producing damaging winds.
• Damaging Winds in Pennsylvania, August 12, 202150 kt wind · 5 eventsA prolonged stretch of hot and humid weather over the mid-Atlantic continued on August 12. Once again, as in the prior two days, weak lee side surface troughing over Pennsylvania aided in afternoon convective development in an environment of high instability but low shear.
• Hail and Damaging Winds in Missouri, August 12, 20211.75 in hail · 21 eventsMultiple rounds of severe storms moved through the area on the afternoon of August 12. The first round occurred in the early afternoon along a mostly stationary boundary just north of Interstate 70. These storms produced scattered instances of damaging winds.
• Damaging Winds in New Jersey, August 12, 202150 kt wind · 2 eventsA prolonged stretch of hot and humid weather over the mid-Atlantic continued on August 12. Once again, as in the prior two days, weak lee side surface troughing over Pennsylvania aided in afternoon convective development in an environment of high instability but low shear.
• Damaging Winds in Illinois, August 12, 2021$5,000 · 61 kt wind · 3 eventsA backbuilding cluster of thunderstorms near the MO/IA border slowly sagged southward during the afternoon hours on August 12th. An additional cluster of thunderstorms congealed across northeastern Kansas into north-central Missouri and merged into the backbuilding cluster.
• Damaging Winds in New Jersey, August 12, 2021$4,000 · 52 kt wind · 2 eventsA low pressure trough in a hot and humid air mass triggered severe thunderstorms across Northeastern New Jersey.
• Damaging Winds in Massachusetts, August 12, 2021$21,000 · 59 kt wind · 14 eventsExcessive Heat Warnings were in effect across much of southern New England with temperatures well up into the 90s and dewpoints in the mid 70s.
• Damaging Winds in Massachusetts, August 12, 202150 kt wind · 3 eventsThe continuation of a hot and humid air mass led to the development of a few showers and thunderstorms during the afternoon hours across western Massachusetts. Damaging wind gusts knocked down a few trees as a result.
• Hail and Damaging Winds in Ohio, August 12, 202155 kt wind · 13 eventsRemnants of mesoscale convective systems over the Great Lakes advanced into the Ohio River Valley throughout the day on August 12th and helped to create severe storms.
• Damaging Wind and Lightning Strikes in New York, August 12, 20211 death · 6 injured · $153,000 · 52 kt wind · 3 eventsA low pressure trough in a hot and humid air mass triggered severe thunderstorms across Southeastern New York.
• Damaging Wind in Georgia, August 12 to 16, 202160 kt wind · 1 eventDeep, moist southerly flow combined with daytime solar heating and a passing upper-level trough produced isolated and short-lived severe thunderstorms.
• Damaging Winds and Lightning Strike in North Carolina, August 12, 2021$16,000 · 50 kt wind · 6 eventsA lee trough was present across the northwest Piedmont of western North Carolina. Daytime heating along with plentiful moisture led to numerous showers and storms across the northwest Piedmont.
• Damaging Winds in Texas, August 12, 202158 kt wind · 2 eventsOn the afternoon of the 12th, scattered thunderstorms developed across the central South Plains under a very deeply mixed and and hot atmosphere. A couple of these storms became severe over Lubbock and Swisher Counties.
• Damaging Winds and Lightning Strike in Florida, August 12, 20212 injured · $30,000 · 52 kt wind · 3 eventsSevere storms produce damage in Manatee County and lightning strikes two in Pinellas County.
• Damaging Winds in Indiana, August 12, 2021$2,000 · 50 kt wind · 3 eventsA small upper wave overriding hot and very humid low levels led to an organized late day squall line over west-central Indiana, which produced isolated wind damage across several counties.
• Flash Flood and Damaging Wind in New Mexico, August 12, 2021$20,000 · 51 kt wind · 2 eventsA storm system over southeast New Mexico combined with an abundant amount of atmospheric moisture resulted in numerous thunderstorms across eastern New Mexico on August 12, 2021.
• Tornado in Texas, August 12, 2021$5,000 · EF0 · 1 eventThere was a tornado near Cypress.
• Flash Flooding and Hail in Kansas, August 12 to 13, 20211 in hail · 8 eventsScattered storm initially developed along a front and evolved into a nighttime complex of storms producing a few hail, wind and flash flooding reports.
• Damaging Winds in Missouri, August 12, 2021$40,000 · 61 kt wind · 9 eventsA backbuilding cluster of thunderstorms near the MO/IA border slowly sagged southward during the afternoon hours on August 12th. An additional cluster of thunderstorms congealed across northeastern Kansas into north-central Missouri and merged into the backbuilding cluster.
• Flash Flood and Hail in Kansas, August 12, 20211.75 in hail · 6 eventsDuring the afternoon strong to severe thunderstorms formed over Northwest Kansas. Wind gusts of 60 MPH were reported near Leoti. Later in the afternoon hail up to golf ball size was reported in the Angelus and Menlo area.
• Hail and Damaging Wind in Colorado, August 12, 20211.75 in hail · 3 eventsDuring the afternoon strong to severe thunderstorms developed over East Central Colorado. Wind gusts of 50-60 MPH were reported in Cheyenne Wells during the afternoon. The storm activity continued into the evening. Hail up to golf ball size was reported at Vona.
• Damaging Winds in Connecticut, August 12, 202150 kt wind · 2 eventsThe continuation of a hot and humid air mass led to the development of a batch of showers and thunderstorms during the afternoon hours across northwestern Connecticut. Damaging wind gusts knocked down trees and power lines as a result.
• Hail and Damaging Winds in Kansas, August 12, 20211 injured · 1 in hail · 12 eventsStrong winds again pummeled portions of north central KS on the 12th. Wind gusts up to 75 mph were recorded along with several power poles being blown down.
• Damaging Winds in Connecticut, August 12, 2021$23,000 · 56 kt wind · 4 eventsExcessive Heat Warnings were in effect across much of southern New England with temperatures well up into the 90s and dewpoints in the mid 70s.
• Damaging Wind in Maine, August 12, 202150 kt wind · 1 eventIsolated thunderstorms developed along a weak cold front late in the afternoon and early evening hours on the 12th. One storm became severe, knocking down trees and wires in Madison.
• Flash Flood and Hail in Kansas, August 12, 20211.75 in hail · 13 eventsAfter an initial round of thunderstorms formed and moved out of the area, a second round of thunderstorms formed in the late afternoon to evening that produced some severe hail, that got up to around an inch, with some isolated golfball sized hail.
• Hail in Kansas, August 12, 2021$275,000 · 1.5 in hail · 4 eventsBetween 4:30-8:30 p.m. CDT on this Thursday afternoon and evening, scattered strong to marginally-severe storms roamed parts of this six-county North Central Kansas area, with the majority of activity concentrated within Osborne, Rooks, Mitchell and Smith counties.
• Damaging Wind in Texas, August 12, 202154 kt wind · 1 eventOn the evening of the 12th of August, scattered thunderstorms impacted the southern Texas Panhandle.
• Flash Flood and Hail in Utah, August 12 to 14, 20211 in hail · 2 eventsIsolated summer thunderstorms produced localized flash flooding and hail in southern Utah.
• Damaging Wind in Indiana, August 12, 2021$20,000 · 61 kt wind · 1 eventA cold front trailed southwest across the central Plains from a surface low pressure center over the Great Lakes region. Within the warm sector of the low, loosely organized clusters of thunderstorms moved southeast within a region of hot and humid southwest winds.
• Hail and Damaging Winds in Kansas, August 12, 20211 in hail · 4 eventsIsolated storms developed across northern counties along a surface boundary once again with isolated hail reports from them.
• Hail in Louisiana, August 12, 20210.88 in hail · 1 eventUpper ridging was centered over the Southeast U.S. during the afternoon of August 12th, resulting in a deep southerly flow to the west of the ridge over and west of the Lower Mississippi Valley.
• Damaging Winds in Missouri, August 12, 2021$11,000 · 56 kt wind · 5 eventsA cold front trailed southwest across the central Plains from a surface low pressure center over the Great Lakes region. A line of thunderstorms moved southeast within a region of hot and humid southwest winds ahead of the front.
• Damaging Winds in Illinois, August 12, 2021$5,000 · 55 kt wind · 2 eventsA cold front trailed southwest across the central Plains from a surface low pressure center over the Great Lakes region. A line of thunderstorms moved southeast within a region of hot and humid southwest winds ahead of the front.
• Damaging Winds in Kentucky, August 12, 2021$23,000 · 50 kt wind · 5 eventsScattered thunderstorms developed along a slow moving boundary across northern Kentucky in the evening hours.
• Hail in Colorado, August 12, 20211 in hail · 1 eventIsolated to scattered thunderstorms occurred across the lower elevations of southern Colorado on this day, with a few large hail reports noted with the stronger storms.
• Flash Flooding in Texas, August 12, 20212 deaths · 2 eventsA surface low was setup over New Mexico with a weak easterly wave moving through the Borderland similar to a setup from August 1st, 2006. Deep moisture was in place around the area and storms were slow moving which allowed for very heavy rain to occur.
• Flash Flood in New Mexico, August 12, 2021$750,000 · 1 eventA surface low was setup over New Mexico with a weak easterly wave moving through the Borderland similar to a setup from August 1st, 2006. Deep moisture was in place around the area and storms were slow moving which allowed for very heavy rain to occur.
• Flash Flood in Florida, August 12, 2021$1,000 · 1 eventHigh moisture levels associated with increasing east winds due in part to Tropical Storm Fred near the NE coast of Cuba led to heavy showers moving onshore the SE coast of Florida, causing localized flooding.
• Hail in New York, August 12, 20210.75 in hail · 1 eventHot and humid conditions helped create an unstable environment during the afternoon hours. Storms triggered along a passing disturbance.
• Hail in Nebraska, August 12, 20211 in hail · 1 eventDuring the evening, hail up to quarter size was reported with a thunderstorm near Indianola.
• Flash Flood in Arkansas, August 13, 2021$20,000 · 1 eventA cold front moved in from the northwest causing thunderstorms to develop resulting in some flash flooding in portions of Arkansas and southwestern Tennessee.
• Damaging Wind and Lightning Strike in North Carolina, August 13, 20217 injured · $10,000 · 50 kt wind · 2 eventsIsolated to widely scattered thunderstorms developed across western North Carolina throughout the afternoon and evening. Cloud to ground lightning from one of the storms caused injuries in the Grandfather Mountain area during the early afternoon.
• Flash Flooding in Missouri, August 13, 20212 eventsA cluster of strong thunderstorms over southeastern Missouri resulted in a quick 2 to 3 inches of rain in 90 minutes near the Poplar Bluff area. The storms occurred in a very weakly forced environment, however, the air mass was very moist and unstable.
• Damaging Winds in Virginia, August 13, 2021$5,000 · 50 kt wind · 8 eventsWithout large scale forcing, pulse storms began forming in the afternoon once sufficient daytime heating was able to initiate convection. A highly unstable environment allowed some of these storms to form strong downdrafts and damaging winds.
• Damaging Winds in Arkansas, August 13, 202152 kt wind · 2 eventsSevere thunderstorms brought wind damage to central and north Arkansas.
• Flash Flood and Damaging Winds in West Virginia, August 13, 2021$99,000 · 50 kt wind · 9 eventsA cold front approached the Ohio Valley along with a series of upper level disturbances, which allowed for showers and thunderstorms to develop across West Virginia on August 13th.
• Damaging Winds in Tennessee, August 13, 2021$30,000 · 56 kt wind · 5 eventsScattered showers and thunderstorms developed in the morning hours on August 13th. There were multiple damaging wind reports received.
• Hail and Damaging Winds in Virginia, August 13, 2021$312,000 · 1.75 in hail · 49 eventsA cold front intersected an extremely unstable airmass. The result was numerous strong to severe thunderstorms containing damaging wind gusts and some hail.
• Hail and Damaging Winds in New York, August 13, 2021$5,000 · 1 in hail · 6 eventsAn upper level tough passed through Central New York, which triggered scattered thunderstorms. Hot, humid conditions led to some localized instability. A few storms became severe with large hail and strong winds.
• Damaging Winds in West Virginia, August 13, 2021$72,000 · 65 kt wind · 7 eventsA cold front intersected an extremely unstable airmass. The result was numerous strong to severe thunderstorms containing damaging wind gusts and some hail.
• Damaging Winds in Pennsylvania, August 13, 2021$145,000 · 52 kt wind · 16 eventsScattered showers and storms developed in a very warm and very humid airmass over central Pennsylvania during the afternoon of August 13, 2021, well ahead of an approaching cold front over the eastern Great Lakes.
• Flash Flooding and Hail in New York, August 13, 20211 in hail · 35 eventsThe final hot and humid day resulted in another round of scattered showers and thunderstorms, some severe, during the afternoon and early evening hours ahead of an approaching cold front across eastern New York.
• Damaging Winds and Lightning Strikes in Maryland, August 13, 2021$714,000 · 60 kt wind · 41 eventsA cold front intersected an extremely unstable airmass. The result was numerous strong to severe thunderstorms containing damaging wind gusts and some hail.
• Flash Flood and Damaging Winds in Ohio, August 13, 2021$32,000 · 53 kt wind · 10 eventsA cold front approached the Ohio Valley along with a series of upper level disturbances which allowed for showers and thunderstorms to develop along southeast Ohio during the afternoon and evening of August 13th.
• Damaging Winds in Ohio, August 13, 2021$21,000 · 50 kt wind · 10 eventsScattered thunderstorms developed during the afternoon hours as an upper level disturbance moved through the Ohio Valley.
• Damaging Winds in West Virginia, August 13, 2021$6,000 · 55 kt wind · 2 eventsWithout large scale forcing, pulse storms began forming in the afternoon once sufficient daytime heating was able to initiate convection. A highly unstable environment allowed some of these storms to form strong downdrafts and damaging winds.
• Flash Flooding and Damaging Winds in Oklahoma, August 13, 2021$10,000 · 61 kt wind · 10 eventsScattered thunderstorms developed during the mid afternoon on the 13th, with several severe wind reports and a few flood reports received across central OK.
• Damaging Winds in Virginia, August 13, 2021$22,000 · 50 kt wind · 9 eventsScattered severe thunderstorms associated with a surface trough produced damaging winds across portions of central Virginia and the Virginia northern neck.
• Damaging Wind in Florida, August 13, 2021$2,000 · 1 eventTropical moisture increased from the south in the afternoon over a diurnally unstable airmass. A dominant east coast sea breeze focused the best low level convergence during the afternoon and evening toward the I-75 corridor where a few strong storms developed with gusty winds.
• Hail and Damaging Winds in Arkansas, August 13, 20211 in hail · 7 eventsThunderstorms developed across northwestern Arkansas during the afternoon of the 13th along a remnant outflow boundary that stretched across the area from earlier thunderstorms.
• Damaging Wind in Michigan, August 13, 202154 kt wind · 1 eventA thunderstorm brought down trees in southern Monroe County.
• Flash Flood in Tennessee, August 13, 2021$20,000 · 1 eventA cold front moved in from the northwest causing thunderstorms to develop resulting in some flash flooding in portions of Arkansas and southwestern Tennessee.
• Damaging Wind in Georgia, August 13, 202150 kt wind · 1 eventA typical summertime pattern prevailed with scattered afternoon thunderstorms across portions of southwest and south-central Georgia. Some mid-level dry air made the environment slightly more favorable for gusty winds with a report of several trees down in Lowndes county.
• Flash Flood in New Mexico, August 13, 20211 eventA very slow-moving storm system remained over southeastern New Mexico on August 13, 2021. Combined with an abundant amount of atmospheric moisture, another active monsoon day was underway across eastern New Mexico.
• Lightning Strikes in Florida, August 13, 20212 injured · 2 eventsIndividuals struck by lightning during afternoon storms in Clearwater and Safety Harbor.
• Damaging Winds in Ohio, August 13, 202155 kt wind · 15 eventsStorms developed the afternoon of the 13th as a result of a passing shortwave to the south and a slow moving trough located north of the Great Lakes. Just like the previous day, despite the fact that effective shear was slightly weak, DCAPE was ranging between 900 to 1000 J/kg.
• Damaging Wind in Pennsylvania, August 13, 2021$1,000 · 50 kt wind · 1 eventAn upper level tough passed through Northeastern Pennsylvania, which triggered scattered thunderstorms. Hot, humid conditions led to some localized instability. One storm became severe with strong winds and knocked down a tree onto a roadway.
• Damaging Wind and Heavy Rain in Texas, August 13 to 15, 202155 kt wind · 2 eventsAbundant monsoonal moisture over the region combined with warm surface temperatures to create another afternoon of scattered thunderstorms across the entire region. Storms were mostly unorganized with the lack of shear available in the atmosphere.
• Flash Flooding and Hail in Pennsylvania, August 13, 2021$65,000 · 60 kt wind · 39 eventsStorms developed the afternoon of the 13th as a result of a passing shortwave to the south and a slow moving trough located north of the Great Lakes. Just like the previous day, despite the fact that effective shear was slightly weak, DCAPE was ranging between 900 to 1000 J/kg.
• Flash Flooding and Damaging Wind in Alabama, August 13, 2021$2,000 · 4 eventsScattered to numerous thunderstorms erupted during the afternoon hours in northwest into north central Alabama. The thunderstorms knocked a couple of trees down and produced flash flooding in Colbert County.
• Damaging Wind in Oklahoma, August 13, 202152 kt wind · 1 eventScattered thunderstorms developed during the afternoon of the 13th along a remnant outflow boundary that stretched across the area from earlier thunderstorms.
• Damaging Wind in Nevada, August 13, 202150 kt wind · 1 eventA typical unstable summertime airmass allowed for scattered thunderstorms.
• Damaging Wind in District of Columbia, August 13, 2021$2,000 · 1 eventA cold front intersected an extremely unstable airmass. The result was numerous strong to severe thunderstorms containing damaging wind gusts and some hail.
• Flash Flood and Hail in Colorado, August 13, 2021$10,000 · 0.87 in hail · 2 eventsLocalized flash flooding occurred along Kauffman Creek in the East Troublesome burn area. A strong thunderstorm also produced nickel size hail in Park County.
• Damaging Wind in West Virginia, August 13, 202155 kt wind · 1 eventStorms developed the afternoon of the 13th as a result of a passing shortwave to the south and a slow moving trough located north of the Great Lakes. Just like the previous day, despite the fact that effective shear was slightly weak, DCAPE was ranging between 900 to 1000 J/kg.
• Flash Flooding in Texas, August 13, 2021$100,000 · 2 eventsA weak upper level trough remained over far west Texas and combined with near record atmospheric moisture levels resulting in heavy rain across much of El Paso County resulting in flash flooding in Canutillo and around the Montana Vista area.
• Damaging Winds in Delaware, August 13, 202165 kt wind · 3 eventsAs oppressive heat and humidity continued over the mid-Atlantic, another round of weakly forced convection developed on August 13. Storms lacked organization overall, but due to high instability a few did become strong to severe and produced damaging winds.
• Tornado in Nevada, August 13, 2021EF0 · 1 eventA landspout tornado was reported and photographed over the South Fork area.
• Damaging Winds in Tennessee, August 13, 202152 kt wind · 3 eventsA few thunderstorms produced wind gusts that blew down trees across parts of northeast Tennessee.
• Flash Flooding and Damaging Wind in Arizona, August 13, 2021$22,000 · 59 kt wind · 4 eventsScattered thunderstorms developed across Graham and Cochise counties and moved west to southwest into the evening hours. Storms produced heavy rain and flash flooding near Willcox, Benson and St. David.
• Hail in Wyoming, August 13, 20211.25 in hail · 1 eventIsolated thunderstorm near Rock River produced half dollar size hail during the early evening on the 13th.
• Flash Flooding in New Mexico, August 13, 2021$250,000 · 2 eventsA weak upper level trough remained over south-central New Mexico and combined with near record atmospheric moisture levels resulting in heavy rain across much of Dona Ana County resulting in flash flooding from Las Cruces south to Santa Teresa.
• Hail and Damaging Winds in Virginia, August 13, 20211 in hail · 3 eventsA few thunderstorms produced large hail and wind gusts that blew down trees across parts of southwest Virginia.
• Damaging Wind in Georgia, August 13, 2021$2,000 · 50 kt wind · 1 eventAmple low-level moisture and strong daytime heating produced an isolated severe thunderstorm over central Georgia.
• Flash Flooding and Dust Storm in Arizona, August 13 to 14, 20212 deaths · $26 million · 65 kt wind · 39 eventsA classic bow echo developed along the Mogollon Rim in central Arizona around 1900MST on the 13th and merged with thunderstorm clusters that developed in south-central Arizona around 2030MST to form one southwestward-moving MCS that progressed all the way to the town of Yuma in…
• Damaging Wind in Arizona, August 13, 202158 kt wind · 1 eventMonsoon moisture over northern Arizona allowed thunderstorms to develop over central Arizona. Some thunderstorms produced damaging winds during the evening hours.
• Flash Flooding and Heavy Rain in New Mexico, August 14, 2021$250,000 · 4 eventsA continued very moist pattern remained across the Borderland and brought a third day of heavy rain to the La Union area which over the course of 3 days received over 7 inches of rainfall.
• Hail in Nebraska, August 14, 20211.75 in hail · 14 eventsA couple of storms developed across the northwest Sandhills. The storms then become severe as they moved southward across portions of western and southwestern Nebraska.
• Damaging Winds in Massachusetts, August 14, 2021$2,000 · 50 kt wind · 2 eventsHot and humid conditions preceded a cold front which brought isolated strong to severe storms to Cape Cod shortly after noon.
• Flash Flood in Texas, August 14, 20211 eventA third day of very deep moisture across the Borderland brought heavy rain to the Canutillo area and additional flash flooding after 5 to 7 inches of rain fell in the previous 3 days.
• Flash Flooding in Arizona, August 14, 2021$23,000 · 4 eventsScattered thunderstorms drifted southwest across southeast Arizona throughout the entire day and into the evening. One storm produced a funnel cloud near Willcox.
• Flash Flood and Hail in North Carolina, August 14, 20211 in hail · 14 eventsScattered to numerous showers and thunderstorms developed along a pre-frontal trough in a very hot and unstable environment over the North Carolina Piedmont.
• Damaging Winds in Virginia, August 14, 2021$32,000 · 60 kt wind · 7 eventsA cold front crossed southwest Virginia in the late afternoon, providing forcing for thunderstorms as it crossed a very humid environment. A few if these storms produced damaging winds.|.
• Damaging Winds and Lightning Strikes in Virginia, August 14, 2021$341,000 · 65 kt wind · 6 eventsThunderstorms ignited along a stalled front and produced several instances of wind damage.
• Hail and Damaging Winds in North Carolina, August 14, 2021$45,000 · 60 kt wind · 10 eventsNumerous thunderstorms developed over western North Carolina throughout the afternoon. A number of the storms produced brief damaging wind gusts and some hail.
• Hail and Damaging Winds in South Carolina, August 14 to 15, 2021$47,000 · 55 kt wind · 11 eventsNumerous thunderstorms developed over upstate South Carolina throughout the afternoon. A number of the storms produced brief damaging wind gusts and some hail.
• Damaging Wind in Maine, August 14, 202150 kt wind · 1 eventA line of thunderstorms formed just ahead of a cold front that moved toward the Midcoast of Maine during the afternoon hours on the 14th. The line of storms stayed sub-severe except for one isolated storm that was strong enough to knock down a few trees.
• Damaging Wind in Maine, August 14, 202152 kt wind · 1 eventThunderstorms developed during the afternoon of the 14th in advance of a cold front crossing the region. An isolated severe thunderstorm produced damaging winds in Hancock county.
• Hail in South Dakota, August 14, 20211 in hail · 3 eventsA thunderstorm quickly became severe along the eastern foothills of the Black Hills and tracked south-southeast into southwestern South Dakota before weakening. The storm produced hail to quarter size along its path.
• Hail in Texas, August 14, 20210.88 in hail · 1 eventNickel sized hail was reported in Athens.
• Hail in South Dakota, August 14, 20212.5 in hail · 9 eventsA thunderstorm became severe over the central Black Hills, then tracked south-southeast before weakening as it eventually moved onto the plains. The storm produced hail to golf ball size.
• Damaging Winds and Lightning Strikes in Virginia, August 14, 2021$39,000 · 50 kt wind · 17 eventsScattered severe thunderstorms in advance of a cold front produced damaging winds and lightning damage across portions of central and southeast Virginia.
• Damaging Wind in Florida, August 14, 2021$5,000 · 1 eventAfternoon thunderstorms produced minor damage to a carport attached to a mobile home.
• Flash Flooding in Kentucky, August 14 to 16, 20216 eventsOn the 14th, a cold front worked its way south through central Kentucky to Tennessee, but by the 16th, the slow moving front was on its way back north as a warm front.
• Damaging Wind in South Carolina, August 14, 202165 kt wind · 1 eventIsolated severe thunderstorms developed in deep southerly flow along a decaying stationary frontal boundary near the South Carolina and North Carolina border.
• Hail in South Dakota, August 14, 20212.75 in hail · 5 eventsA left-moving supercell thunderstorm developed over southeastern Meade County and tracked eastward into northeastern Pennington County and western Haakon County before weakening in the Philip area. The storm produced hail to the size of baseballs along its track.
• Flash Flood and Damaging Winds in Kentucky, August 14, 2021$600 · 50 kt wind · 3 eventsA cold front slowly dropped into Kentucky during the morning of August 14. It then began to stall out during the day across eastern Kentucky.
• Damaging Wind in Texas, August 14, 202152 kt wind · 1 eventA weak upper trough drifted south across East Texas and North Louisiana during the daytime hours of August 14th, which reinforced a weak surface trough south into these areas.
• Hail in Nebraska, August 14, 20212.5 in hail · 13 eventsSevere thunderstorms developed the afternoon and evening of 14 August across the Nebraska Panhandle. Very large hail reported at several locations.
• Flash Flooding and Damaging Winds in Tennessee, August 14, 202152 kt wind · 7 eventsTypical summer afternoon thunderstorms affected East Tennessee, but a few strengthened and produced damaging wind gusts that blew down trees. Locally heavy rainfall resulted in flooding.
• Hail in South Dakota, August 14, 20211 in hail · 1 eventA nearly stationary thunderstorm over western Mellette County became severe for a brief period. The storm produced large hail northwest of White River.
• Hail in South Dakota, August 14, 20211.5 in hail · 2 eventsA few isolated severe storms moved very slowly from north central into central South Dakota during the evening hours.

Every billion-dollar disasterEvery storm of 2021Tornadoes in 2021

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.