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The severe wind outbreak of August 12, 2021

318 wind reportsPennsylvania, Illinois, Ohio and 20 more states

318 damaging wind reports across 23 states between 2:15 AM and 11:15 PM CDT, 7 of them 65 knots (75 mph) or stronger; the strongest measured gust was 82 mph in Jackson County, MO. 64 hail reports and 1 tornado the same day.

Watch the day unfold

Severe wind day · August 12, 2021

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 318 that day
Strongest gust—measured, so far
Largest hail—so far

The day in numbers

Wind reports
318
on Thursday, August 12, 2021
75 mph or more
7
0 of 86 mph (75 knots) or more
Strongest measured gust
82 mph
71 knots, Jackson County, MO
Measured
17
reports with an instrument reading; the rest are estimates from damage
Killed by wind
0
3 injured
Counties reporting
142
in 23 states

Hour by hour

Damaging wind reports in each hour, Central Daylight Time.

Wind reports per hour, August 12, 2021 2 AM: 4 3 AM: 4 4 AM: 11 5 AM: 22 6 AM: 7 7 AM: 0 8 AM: 0 9 AM: 3 10 AM: 3 11 AM: 1 Noon: 9 1 PM: 11 2 PM: 32 3 PM: 30 4 PM: 52 52 5 PM: 41 6 PM: 41 7 PM: 8 8 PM: 15 9 PM: 18 10 PM: 5 11 PM: 1 2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 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 12, 2021
4:38 PMJackson County MO82 mph71Measured0
5:17 PMJackson County MO78 mph68Measured0
2:29 AMKankakee County IL75 mph65Estimated0
2:29 AMKankakee County IL75 mph65Estimated0
2:30 AMKankakee County IL75 mph65Estimated0
4:56 PMLincoln County KS75 mph65Estimated0
4:57 PMLincoln County KS75 mph65Estimated0
6:45 PMEllis County KS74 mph64Measured0
4:15 AMElkhart County IN70 mph61Estimated0
4:15 AMElkhart County IN70 mph61Estimated0
4:30 AMElkhart County IN70 mph61Estimated0
4:32 AMElkhart County IN70 mph61Estimated0
4:46 AMSt. Joseph County MI70 mph61Estimated0
4:46 AMSt. Joseph County MI70 mph61Estimated0
4:53 AMSt. Joseph County MI70 mph61Estimated0
4:57 AMSt. Joseph County MI70 mph61Estimated0
4:57 AMSt. Joseph County MI70 mph61Estimated0
5:07 AMBranch County MI70 mph61Estimated0
5:20 AMHillsdale County MI70 mph61Estimated0
5:35 AMKosciusko County IN70 mph61Estimated0
5:37 AMLenawee County MI70 mph61Estimated0
5:37 AMKosciusko County IN70 mph61Estimated0
6:55 AMDefiance County OH70 mph61Estimated0
2:27 PMSangamon County IL70 mph61Estimated0
2:39 PMSangamon County IL70 mph61Estimated0
2:44 PMSangamon County IL70 mph61Estimated0
2:44 PMSangamon County IL70 mph61Estimated0
2:47 PMSangamon County IL70 mph61Estimated0
2:48 PMSangamon County IL70 mph61Estimated0
2:48 PMSangamon County IL70 mph61Estimated0
2:48 PMSangamon County IL70 mph61Estimated0
2:48 PMSangamon County IL70 mph61Estimated0
2:48 PMSangamon County IL70 mph61Estimated0
2:48 PMSangamon County IL70 mph61Estimated0
3:06 PMSangamon County IL70 mph61Estimated0
3:10 PMChristian County IL70 mph61Estimated0
3:10 PMChristian County IL70 mph61Estimated0
3:15 PMChristian County IL70 mph61Estimated0
3:30 PMMontgomery County IL70 mph61Estimated0
3:38 PMShelby County IL70 mph61Estimated0
3:50 PMShelby County IL70 mph61Estimated0
4:45 PMMarion County MO70 mph61Estimated0
4:51 PMLincoln County KS70 mph61Estimated0
5:40 PMLincoln County KS70 mph61Estimated0
5:45 PMLincoln County MO70 mph61Estimated0
5:58 PMWarren County MO70 mph61Estimated0
5:59 PMRussell County KS70 mph61Estimated0
6:02 PMSt. Charles County MO70 mph61Estimated0
6:12 PMLincoln County KS70 mph61Estimated0
6:21 PMFranklin County MO70 mph61Estimated0
6:41 PMJefferson County MO70 mph61Estimated0
6:43 PMGibson County IN70 mph61Estimated0
6:54 PMMadison County IL70 mph61Estimated0
2:15 AMWill County IL69 mph60Estimated0
2:08 PMWilkes County NC69 mph60Estimated0
4:15 PMColumbia County GA69 mph60Estimated0
4:27 PMHampden County MA68 mph59Measured0
5:05 PMSwisher County TX67 mph58Measured0
7:01 PMSt. Clair County IL67 mph58Measured0
9:54 PMClark County NV67 mph58Measured0
3:50 AMMarshall County IN64 mph56Estimated0
3:50 AMMarshall County IN64 mph56Estimated0
3:55 AMMarshall County IN64 mph56Estimated0
4:39 AMSt. Joseph County MI64 mph56Estimated0
5:04 AMBranch County MI64 mph56Estimated0
5:10 AMBranch County MI64 mph56Estimated0
5:11 AMPulaski County IN64 mph56Estimated0
5:18 AMHillsdale County MI64 mph56Estimated0
5:18 AMHillsdale County MI64 mph56Estimated0
5:23 AMHillsdale County MI64 mph56Estimated0
5:25 AMHillsdale County MI64 mph56Estimated0
5:32 AMFulton County IN64 mph56Estimated0
5:44 AMKosciusko County IN64 mph56Estimated0
5:51 AMKosciusko County IN64 mph56Estimated0
6:30 AMKosciusko County IN64 mph56Estimated0
3:15 PMChariton County MO64 mph56Estimated0
3:20 PMChariton County MO64 mph56Estimated0
4:27 PMHampden County MA64 mph56Estimated0
5:00 PMHartford County CT64 mph56Estimated0
5:20 PMHillsdale County MI64 mph56Estimated0
5:41 PMLincoln County KS64 mph56Estimated0
6:25 PMSt. Louis County MO64 mph56Estimated0
6:44 PMSt. Louis MO64 mph56Estimated0
8:20 PMPerry County MO64 mph56Estimated0
10:00 PMCarter County MO64 mph56Estimated0
8:10 PMPerry County IL63 mph55Measured0
11:15 PMClark County NV63 mph55Measured0
5:37 AMLenawee County MI63 mph55Estimated0
9:04 AMFord County IL63 mph55Estimated0
10:45 AMMercer County PA63 mph55Estimated0
10:55 AMLawrence County PA63 mph55Estimated0
11:00 AMLawrence County PA63 mph55Estimated0
12:25 PMArmstrong County PA63 mph55Estimated0
12:38 PMJefferson County PA63 mph55Estimated0
12:40 PMJefferson County PA63 mph55Estimated0
12:42 PMJefferson County PA63 mph55Estimated0
3:43 PMYadkin County NC63 mph55Estimated0
3:49 PMVenango County PA63 mph55Estimated0
4:11 PMJefferson County OH63 mph55Estimated0
4:15 PMLawrence County PA63 mph55Estimated0

By state

Severe weather reports by state, August 12, 2021
Pennsylvania91—71.75
Illinois3167 mph41.00
Ohio29—41.00
Michigan2659 mph0—
Missouri2582 mph111.75
Indiana22—0—
Massachusetts1768 mph0—
New York13—10.75
North Carolina12—31.75
Kansas1174 mph281.75
Virginia8—0—
Connecticut6—0—
Kentucky6—0—
New Jersey4—0—
Alabama3—0—
Arizona3—0—
Texas367 mph0—
Florida2—0—
Nevada267 mph0—
Colorado1—31.75
Georgia1—0—
Maine1—0—
New Mexico159 mph0—
Iowa0—11.00
Louisiana0—10.88
Nebraska0—11.00

Counties with the most wind reports

Hail and tornadoes that day

64 hail reports, 0 of 2 inches or more; 1 tornado.

Largest hail, August 12, 2021
2:15 PMAshe County NC1.75
4:14 PMCrawford County PA1.75
4:18 PMCrawford County PA1.75
4:47 PMJackson County MO1.75
5:20 PMJohnson County KS1.75
6:18 PMSheridan County KS1.75
6:21 PMSheridan County KS1.75
7:26 PMThomas County KS1.75
8:24 PMKit Carson County CO1.75
1:57 PMAshe County NC1.50
5:10 PMOsborne County KS1.50
7:30 PMJohnson County KS1.50
9:45 PMLeavenworth County KS1.50
2:09 PMAshe County NC1.25
4:54 PMJackson County MO1.25
5:00 PMJackson County MO1.25
5:02 PMJackson County MO1.25
5:09 PMJohnson County KS1.25
5:15 PMJohnson County KS1.25
9:54 PMWyandotte County KS1.25
7:50 AMVan Buren County IA1.00
9:02 AMFord County IL1.00
2:40 PMLivingston County MO1.00
3:36 PMPlatte County MO1.00
3:56 PMPlatte County MO1.00
4:36 PMOttawa County KS1.00
4:40 PMJackson County MO1.00
5:00 PMLincoln County KS1.00
5:00 PMJackson County MO1.00
5:11 PMJohnson County KS1.00
5:13 PMMadison County OH1.00
5:15 PMLincoln County KS1.00
5:30 PMMorgan County IL1.00
5:38 PMJohnson County KS1.00
5:41 PMLincoln County KS1.00
6:20 PMRooks County KS1.00
6:28 PMOsborne County KS1.00
6:40 PMLogan County KS1.00
6:55 PMEllis County KS1.00
7:02 PMEllis County KS1.00
7:14 PMShawnee County KS1.00
8:13 PMJohnson County KS1.00
8:15 PMKit Carson County CO1.00
8:17 PMJohnson County KS1.00
8:25 PMJohnson County KS1.00
8:39 PMJackson County MO1.00
8:45 PMEl Paso County CO1.00
10:47 PMRed Willow County NE1.00
10:00 AMClark County MO0.88
6:10 PMOsborne County KS0.88
  • EF0 tornado4:32 PM CDT

2021 · 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.