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The severe wind outbreak of August 10, 2020

736 wind reportsIllinois, Iowa, Indiana and 18 more states

736 damaging wind reports across 21 states between 1:35 AM and 12:20 AM the next day CDT, 158 of them 65 knots (75 mph) or stronger; the strongest measured gust was 145 mph in Benton County, IA. 89 hail reports and 27 tornadoes the same day. The 8th-most wind reports of any day since 1955.

Watch the day unfold

Severe wind day · August 10, 2020

How the day unfolded

Every damaging wind report of the day at its logged time, with the day's hail reports and tornadoes, and the counties they reached.

About this replay
Central time—Historical replay — logged report times
Wind reports—of 736 that day
Strongest gust—measured, so far
Largest hail—so far

The day in numbers

Wind reports
736
8th of 15,807 days with wind reports since 1955
75 mph or more
158
35 of 86 mph (75 knots) or more
Strongest measured gust
145 mph
126 knots, Benton County, IA
Measured
119
reports with an instrument reading; the rest are estimates from damage
Killed by wind
4
113 injured
Counties reporting
273
in 21 states

Hour by hour

Damaging wind reports in each hour, Central Daylight Time.

Wind reports per hour, August 10, 2020 1 AM: 4 2 AM: 0 3 AM: 3 4 AM: 1 5 AM: 6 6 AM: 2 7 AM: 1 8 AM: 13 9 AM: 22 10 AM: 34 11 AM: 54 Noon: 36 1 PM: 28 2 PM: 85 3 PM: 145 145 4 PM: 85 5 PM: 63 6 PM: 78 7 PM: 34 8 PM: 18 9 PM: 10 10 PM: 6 11 PM: 5 Midnight: 3 1 AM4 AM7 AM10 AM1 PM4 PM7 PM10 PM

The strongest winds

The 100 strongest reports with a speed. Measured gusts come from an instrument; estimated speeds are judged from damage.

Strongest wind reports, August 10, 2020
12:00 PMBenton County IA145 mph126Measured0
12:30 PMLinn County IA140 mph122Estimated1
1:10 PMClinton County IA130 mph113Estimated0
12:45 PMCedar County IA120 mph104Estimated0
11:52 AMMarshall County IA106 mph92Measured0
10:54 AMBoone County IA100 mph87Estimated0
11:15 AMStory County IA100 mph87Estimated0
11:30 AMMarshall County IA100 mph87Estimated0
11:34 AMStory County IA100 mph87Estimated0
11:51 AMMarshall County IA100 mph87Estimated0
12:00 PMMarshall County IA100 mph87Estimated0
12:01 PMTama County IA100 mph87Estimated0
12:30 PMTama County IA100 mph87Estimated0
12:30 PMTama County IA100 mph87Estimated0
2:00 PMBureau County IL100 mph87Estimated0
2:15 PMOgle County IL100 mph87Estimated0
11:50 AMMarshall County IA99 mph86Measured0
11:47 AMHardin County IA96 mph83Estimated0
11:50 AMMarshall County IA96 mph83Estimated0
11:51 AMMarshall County IA96 mph83Estimated0
3:57 PMCook County IL96 mph83Estimated0
2:39 PMLee County IL92 mph80Measured0
11:43 AMMarshall County IA91 mph79Measured0
2:40 PMLaSalle County IL91 mph79Measured0
12:00 PMTama County IA90 mph78Estimated0
12:50 PMJones County IA90 mph78Estimated0
1:10 PMScott County IA90 mph78Estimated0
1:15 PMJackson County IA90 mph78Estimated0
3:00 PMDeKalb County IL90 mph78Estimated0
3:02 PMDeKalb County IL90 mph78Estimated0
3:36 PMDuPage County IL90 mph78Estimated0
3:44 PMWill County IL90 mph78Estimated0
4:00 PMCook County IL90 mph78Estimated0
4:00 PMCook County IL86 mph75Estimated0
6:43 PMOchiltree County TX86 mph75Estimated0
11:10 AMPolk County IA85 mph74Measured0
11:40 AMJasper County IA85 mph74Measured0
3:57 PMCook County IL85 mph74Measured0
11:52 AMHardin County IA85 mph74Estimated0
11:58 AMMarshall County IA85 mph74Estimated0
12:10 PMPoweshiek County IA85 mph74Estimated0
2:39 PMWinnebago County IL85 mph74Estimated0
2:42 PMLaSalle County IL85 mph74Estimated0
2:44 PMLaSalle County IL85 mph74Estimated0
2:57 PMLaSalle County IL85 mph74Estimated0
3:02 PMLaSalle County IL85 mph74Estimated0
3:30 PMWill County IL85 mph74Estimated0
3:37 PMWill County IL85 mph74Estimated0
3:32 PMWill County IL84 mph73Measured0
10:20 AMGreene County IA83 mph72Measured0
10:20 AMGreene County IA83 mph72Measured0
4:02 PMCook County IL81 mph70Measured0
10:00 AMCalhoun County IA81 mph70Estimated0
10:25 AMDallas County IA81 mph70Estimated0
11:00 AMPolk County IA81 mph70Estimated0
11:10 AMPolk County IA81 mph70Estimated0
11:20 AMJasper County IA81 mph70Estimated0
11:24 AMJasper County IA81 mph70Estimated0
11:26 AMPolk County IA81 mph70Estimated0
11:29 AMJasper County IA81 mph70Estimated0
12:00 PMPoweshiek County IA81 mph70Estimated1
12:10 PMPoweshiek County IA81 mph70Estimated0
12:30 PMJohnson County IA81 mph70Estimated0
12:50 PMMuscatine County IA81 mph70Estimated0
1:08 PMRock Island County IL81 mph70Estimated0
1:10 PMMercer County IL81 mph70Estimated0
1:30 PMHenry County IL81 mph70Estimated0
1:40 PMWhiteside County IL81 mph70Estimated0
1:45 PMCarroll County IL81 mph70Estimated0
1:50 PMJo Daviess County IL81 mph70Estimated0
2:05 PMStephenson County IL81 mph70Estimated0
2:25 PMPutnam County IL81 mph70Estimated0
2:25 PMLee County IL81 mph70Estimated0
2:45 PMLaSalle County IL81 mph70Estimated0
2:47 PMLaSalle County IL81 mph70Estimated0
2:52 PMLaSalle County IL81 mph70Estimated0
2:53 PMDeKalb County IL81 mph70Estimated0
2:56 PMLaSalle County IL81 mph70Estimated0
3:06 PMTazewell County IL81 mph70Estimated0
3:09 PMKane County IL81 mph70Estimated0
3:17 PMLivingston County IL81 mph70Estimated0
3:18 PMGrundy County IL81 mph70Estimated0
3:50 PMKankakee County IL81 mph70Estimated0
3:50 PMCook County IL81 mph70Estimated0
3:51 PMCook County IL81 mph70Estimated0
4:31 PMLake County IN81 mph70Estimated0
6:30 PMHansford County TX81 mph70Estimated0
11:15 AMPolk County IA78 mph68Measured0
8:57 AMDouglas County NE77 mph67Measured0
11:30 AMPolk County IA77 mph67Measured0
11:38 AMHardin County IA77 mph67Measured0
11:04 AMPolk County IA75 mph65Measured0
11:57 AMMahaska County IA75 mph65Measured0
4:40 PMVermilion County IL75 mph65Measured0
10:15 AMCarroll County IA75 mph65Estimated0
10:32 AMDallas County IA75 mph65Estimated0
10:32 AMDallas County IA75 mph65Estimated0
10:52 AMBoone County IA75 mph65Estimated0
10:55 AMMadison County IA75 mph65Estimated0
10:55 AMMadison County IA75 mph65Estimated0

By state

Severe weather reports by state, August 10, 2020
Illinois25192 mph92.00
Iowa140145 mph31.50
Indiana11072 mph0—
Missouri3264 mph72.50
Wisconsin2963 mph0—
Oklahoma2672 mph11.75
New York21—0—
Georgia19—10.25
Kansas1868 mph152.00
Ohio15—0—
Alabama14—21.00
Michigan1467 mph11.00
Nebraska1477 mph11.00
Texas1172 mph111.50
South Dakota772 mph103.00
Tennessee5—0—
Minnesota461 mph272.00
South Carolina3—0—
Colorado167 mph0—
Kentucky1—0—
Massachusetts1—0—
Florida0—10.75

Counties with the most wind reports

Hail and tornadoes that day

89 hail reports, 8 of 2 inches or more; 27 tornadoes.

Largest hail, August 10, 2020
4:00 AMTodd County SD3.00
5:30 PMVernon County MO2.50
6:40 PMVernon County MO2.50
2:40 AMWright County MN2.00
4:33 AMGregory County SD2.00
6:30 AMWinona County MN2.00
1:35 PMStephenson County IL2.00
5:05 PMRush County KS2.00
1:35 AMHennepin County MN1.75
2:17 AMScott County MN1.75
2:50 AMAurora County SD1.75
3:25 AMDakota County MN1.75
8:34 AMWaseca County MN1.75
3:29 PMGrundy County IL1.75
5:23 PMRush County KS1.75
5:43 PMRush County KS1.75
5:56 PMBeaver County OK1.75
2:16 AMDakota County MN1.50
3:02 AMWright County MN1.50
3:35 AMRice County MN1.50
3:54 AMPine County MN1.50
5:15 AMSteele County MN1.50
5:25 AMRice County MN1.50
9:58 AMSac County IA1.50
5:32 PMSherman County TX1.50
6:07 PMSt. Clair County MO1.50
1:51 AMHennepin County MN1.25
3:55 AMPine County MN1.25
4:54 AMGregory County SD1.25
4:25 PMFord County KS1.25
4:27 PMFord County KS1.25
6:05 PMDent County MO1.25
1:15 AMNess County KS1.00
2:07 AMDakota County MN1.00
2:30 AMWright County MN1.00
2:48 AMDakota County MN1.00
3:00 AMTodd County SD1.00
3:05 AMRice County MN1.00
3:30 AMKanabec County MN1.00
3:35 AMHennepin County MN1.00
3:46 AMSherburne County MN1.00
3:55 AMPine County MN1.00
4:54 AMGregory County SD1.00
4:58 AMGregory County SD1.00
5:06 AMSteele County MN1.00
5:27 AMDodge County MN1.00
5:53 AMLyon County IA1.00
5:58 AMBoyd County NE1.00
6:33 AMBon Homme County SD1.00
6:35 AMBon Homme County SD1.00
  • EFU tornado11:30 AM CDT
  • EFU tornado11:36 AM CDT
  • EF1 tornado11:39 AM CDT
  • EFU tornado12:01 PM CDT
  • EFU tornado12:31 PM CDT
  • EF0 tornado12:32 PM CDT
  • EF0 tornado2:12 PM CDT
  • EF0 tornado2:37 PM CDT
  • EF1 tornado2:47 PM CDT
  • EF0 tornado2:50 PM CDT
  • EF1 tornado2:59 PM CDT
  • EF1 tornado3:05 PM CDT
  • EF1 tornado3:12 PM CDT
  • EF1 tornado3:15 PM CDT
  • EF1 tornado3:35 PM CDT
  • EF0 tornado3:38 PM CDT
  • EF1 tornado3:39 PM CDT
  • EF1 tornado3:41 PM CDT
  • EF1 tornado3:54 PM CDT
  • EF0 tornado3:57 PM CDT
  • EF1 tornado3:59 PM CDT
  • EF0 tornado4:04 PM CDT
  • EF1 tornado4:05 PM CDT
  • EF0 tornado4:15 PM CDT
  • EF1 tornado5:32 PM CDT
  • EF1 tornado5:55 PM CDT
  • EF0 tornado6:43 PM CDT

2020 · On this date in other years · The biggest severe wind days

  1. A report is a single damage or measurement report to the National Weather Service. Several reports can describe one gust front, so reports are not storms.
  2. Reporting has grown with population, spotter networks and the internet, so counts from different decades are not directly comparable.
  3. Thunderstorm wind reports start at 50 knots (58 mph). SPC began flagging measured against estimated speeds in 2006; earlier reports are shown as estimated.

Storm Prediction Center severe weather database, 1955 to 2025. A day is SPC’s calendar date in Central Standard Time; a severe wind day here has 300 or more damaging wind reports, or 15 or more of 75 knots (86 mph) or more.