The severe wind outbreak of August 4, 2010
339 wind reportsOhio, Virginia, West Virginia and 18 more states
339 damaging wind reports across 21 states between 3:50 AM and 11:30 PM CDT, 9 of them 65 knots (75 mph) or stronger; the strongest measured gust was 78 mph in Allegany County, MD. 25 hail reports the same day.
Watch the day unfoldSevere wind day · August 4, 2010
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.
The day in numbers
- Wind reports
- 339
- on Wednesday, August 4, 2010
- 75 mph or more
- 9
- 3 of 86 mph (75 knots) or more
- Strongest measured gust
- 78 mph
- 68 knots, Allegany County, MD
- Measured
- 26
- reports with an instrument reading; the rest are estimates from damage
- Killed by wind
- 4
- 5 injured
- Counties reporting
- 188
- in 21 states
Hour by hour
Damaging wind reports in each hour, Central Daylight Time.
The strongest winds
The 100 strongest reports with a speed. Measured gusts come from an instrument; estimated speeds are judged from damage.
| 3:02 PM | Belmont County OH | 100 mph | Estimated |
| 11:25 AM | Auglaize County OH | 90 mph | Estimated |
| 1:09 PM | Licking County OH | 90 mph | Estimated |
| 2:40 PM | Belmont County OH | 81 mph | Estimated |
| 5:30 PM | Hampshire County WV | 81 mph | Estimated |
| 5:10 PM | Allegany County MD | 78 mph | Measured |
| 11:20 AM | Randolph County IN | 75 mph | Estimated |
| 5:25 PM | Hampshire County WV | 75 mph | Estimated |
| 5:40 PM | Kay County OK | 75 mph | Estimated |
| 4:24 PM | Natrona County WY | 72 mph | Measured |
| 5:48 PM | Frederick County VA | 72 mph | Measured |
| 7:05 PM | Hamilton County IN | 72 mph | Measured |
| 3:50 AM | Scott County IA | 70 mph | Estimated |
| 4:00 AM | Scott County IA | 70 mph | Estimated |
| 4:55 PM | Grant County WV | 70 mph | Estimated |
| 5:25 PM | Kay County OK | 70 mph | Estimated |
| 5:31 PM | Hampshire County WV | 70 mph | Estimated |
| 5:38 PM | Caldwell County KY | 70 mph | Estimated |
| 5:56 PM | Winchester VA | 70 mph | Estimated |
| 7:04 PM | Hartley County TX | 70 mph | Estimated |
| 7:40 PM | Potter County TX | 70 mph | Estimated |
| 7:50 PM | Randolph County IN | 70 mph | Estimated |
| 8:00 PM | Hartley County TX | 70 mph | Estimated |
| 11:03 AM | Van Wert County OH | 69 mph | Estimated |
| 3:15 PM | Ohio County WV | 69 mph | Estimated |
| 3:43 PM | Barbour County AL | 69 mph | Estimated |
| 5:50 PM | Cass County IN | 69 mph | Estimated |
| 9:00 PM | Tangipahoa Parish LA | 69 mph | Estimated |
| 6:13 AM | Kane County IL | 67 mph | Measured |
| 4:50 PM | Sullivan County TN | 67 mph | Estimated |
| 12:55 PM | Morrow County OH | 66 mph | Measured |
| 1:20 PM | Fairfield County OH | 64 mph | Estimated |
| 4:55 PM | Mineral County WV | 64 mph | Estimated |
| 4:55 PM | Allegany County MD | 64 mph | Estimated |
| 4:55 PM | Allegany County MD | 64 mph | Estimated |
| 4:55 PM | Allegany County MD | 64 mph | Estimated |
| 4:56 PM | Allegany County MD | 64 mph | Estimated |
| 4:58 PM | Allegany County MD | 64 mph | Estimated |
| 5:00 PM | Mineral County WV | 64 mph | Estimated |
| 5:00 PM | Allegany County MD | 64 mph | Estimated |
| 5:02 PM | Allegany County MD | 64 mph | Estimated |
| 5:05 PM | Allegany County MD | 64 mph | Estimated |
| 5:07 PM | Allegany County MD | 64 mph | Estimated |
| 5:11 PM | Allegany County MD | 64 mph | Estimated |
| 5:12 PM | Allegany County MD | 64 mph | Estimated |
| 5:15 PM | Allegany County MD | 64 mph | Estimated |
| 5:40 PM | Cowley County KS | 64 mph | Estimated |
| 6:15 PM | Tippecanoe County IN | 64 mph | Estimated |
| 6:23 PM | Fauquier County VA | 64 mph | Estimated |
| 6:38 PM | Boone County IN | 64 mph | Estimated |
| 6:42 PM | Clinton County IN | 64 mph | Estimated |
| 7:04 PM | Fauquier County VA | 64 mph | Estimated |
| 7:19 PM | Spotsylvania County VA | 64 mph | Estimated |
| 7:50 PM | Lawrence County AL | 64 mph | Estimated |
| 6:20 AM | Kane County IL | 63 mph | Estimated |
| 8:00 AM | Porter County IN | 63 mph | Estimated |
| 8:04 AM | Berrien County MI | 63 mph | Estimated |
| 8:09 AM | Starke County IN | 63 mph | Estimated |
| 8:14 AM | Berrien County MI | 63 mph | Estimated |
| 8:37 AM | Berrien County MI | 63 mph | Estimated |
| 9:25 AM | Wabash County IN | 63 mph | Estimated |
| 10:22 AM | Williams County OH | 63 mph | Estimated |
| 10:28 AM | Blackford County IN | 63 mph | Estimated |
| 11:11 AM | Allen County OH | 63 mph | Estimated |
| 12:48 PM | Delaware County OH | 63 mph | Estimated |
| 12:59 PM | Delaware County OH | 63 mph | Estimated |
| 2:20 PM | Elmore County AL | 63 mph | Estimated |
| 3:15 PM | Nelson County KY | 63 mph | Estimated |
| 3:15 PM | Brooke County WV | 63 mph | Estimated |
| 3:15 PM | Brooke County WV | 63 mph | Estimated |
| 3:20 PM | Washington County PA | 63 mph | Estimated |
| 4:00 PM | Washington County PA | 63 mph | Estimated |
| 4:00 PM | Fayette County PA | 63 mph | Estimated |
| 5:15 PM | Wise County VA | 63 mph | Estimated |
| 6:00 PM | Wise County VA | 63 mph | Estimated |
| 6:07 PM | Summers County WV | 63 mph | Estimated |
| 6:15 PM | Madison County NC | 63 mph | Estimated |
| 6:32 PM | Summers County WV | 63 mph | Estimated |
| 7:00 PM | Russell County VA | 63 mph | Estimated |
| 7:28 PM | Campbell County VA | 63 mph | Estimated |
| 7:42 PM | Bedford County VA | 63 mph | Estimated |
| 7:45 PM | Pickens County AL | 63 mph | Estimated |
| 11:15 PM | Adair County KY | 63 mph | Estimated |
| 6:55 AM | Cook County IL | 61 mph | Measured |
| 12:25 PM | Montgomery County OH | 61 mph | Measured |
| 6:14 PM | Harrisonburg VA | 61 mph | Measured |
| 8:54 PM | Hancock County OH | 61 mph | Measured |
| 2:20 PM | Pike County KY | 61 mph | Estimated |
| 2:25 PM | Pike County KY | 61 mph | Estimated |
| 3:55 PM | Rowan County KY | 61 mph | Estimated |
| 4:10 PM | Elliott County KY | 61 mph | Estimated |
| 5:15 PM | Pike County KY | 61 mph | Estimated |
| 5:25 PM | Pike County KY | 61 mph | Estimated |
| 5:40 PM | Pike County KY | 61 mph | Estimated |
| 6:00 PM | Rowan County KY | 61 mph | Estimated |
| 1:00 PM | Delaware County OH | 60 mph | Measured |
| 1:03 PM | Delaware County OH | 60 mph | Measured |
| 3:56 PM | Natrona County WY | 60 mph | Measured |
| 6:42 PM | Kay County OK | 60 mph | Measured |
| 9:00 PM | Montgomery County OH | 60 mph | Measured |
By state
| Ohio | 87 | 66 mph |
| Virginia | 67 | 72 mph |
| West Virginia | 46 | 59 mph |
| Indiana | 20 | 72 mph |
| Mississippi | 20 | — |
| Pennsylvania | 19 | — |
| Maryland | 18 | 78 mph |
| Kentucky | 17 | — |
| Illinois | 12 | 67 mph |
| Alabama | 6 | — |
| Texas | 5 | 59 mph |
| Wyoming | 4 | 72 mph |
| Oklahoma | 4 | 60 mph |
| Michigan | 4 | — |
| Iowa | 3 | — |
| North Carolina | 2 | — |
| Florida | 1 | — |
| Kansas | 1 | — |
| Louisiana | 1 | — |
| New York | 1 | — |
| Tennessee | 1 | — |
| Utah | 0 | — |
| Colorado | 0 | — |
Counties with the most wind reports
- Allegany CountyMD · 13 reports
- Pike CountyKY · 6 reports
- Franklin CountyOH · 6 reports
- Licking CountyOH · 6 reports
- Buckingham CountyVA · 6 reports
- Franklin CountyVA · 6 reports
- Bedford CountyVA · 5 reports
- Wythe CountyVA · 5 reports
- Perry CountyOH · 5 reports
- Belmont CountyOH · 5 reports
Hail and tornadoes that day
25 hail reports, 0 of 2 inches or more; no tornadoes.
| 12:35 PM | Union County OH | 1.75 |
| 12:38 PM | Fairfield County OH | 1.00 |
| 12:40 PM | Greene County OH | 1.00 |
| 1:01 PM | Greene County OH | 1.00 |
| 2:09 PM | Garfield County CO | 1.00 |
| 3:00 PM | Belmont County OH | 1.00 |
| 4:05 PM | Utah County UT | 1.00 |
| 4:40 PM | Escambia County AL | 1.00 |
| 5:13 PM | Swisher County TX | 1.00 |
| 6:45 PM | Kay County OK | 1.00 |
| 7:40 PM | Noble County OK | 1.00 |
| 11:02 AM | Randolph County IN | 0.88 |
| 3:46 PM | Natrona County WY | 0.88 |
| 3:55 PM | Natrona County WY | 0.88 |
| 4:55 PM | Christian County KY | 0.88 |
| 7:04 PM | Hartley County TX | 0.88 |
| 8:30 PM | Johnson County WY | 0.88 |
| 9:40 PM | Butler County OH | 0.88 |
| 9:50 PM | Butler County OH | 0.88 |
| 3:45 PM | Salt Lake County UT | 0.75 |
| 3:55 PM | Salt Lake County UT | 0.75 |
| 5:18 PM | Vermilion County IL | 0.75 |
| 8:05 PM | Utah County UT | 0.75 |
| 9:55 PM | Butler County OH | 0.75 |
| 10:02 PM | Warren County OH | 0.75 |
2010 · On this date in other years · The biggest severe wind days
- 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.
- Reporting has grown with population, spotter networks and the internet, so counts from different decades are not directly comparable.
- 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.