Alert archive / Iowa / Severe Thunderstorm Watches / 2009
Severe Thunderstorm Watches in Iowa, August 2009
11 severe thunderstorm watches in August 2009. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm watches reaches back to 1997.
Severe Thunderstorm Watches by county
Each county as a circle sized by its count in August 2009. Tap one for its archive.
- Severe Thunderstorm Watches
- 11
- Busiest day
- August 9, 20095 severe thunderstorm watches
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 8:41 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 6 hr |
| Aug 2, 11:37 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Audubon, Black Hawk, Boone, Bremer, Butler and 35 more | 6 hr |
| Aug 4, 1:10 AM CDT | Severe Thunderstorm Watch | SPC | Fremont, Page | 6 hr |
| Aug 4, 4:06 AM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Davis, Decatur, Lee, Ringgold, Taylor and 2 more | 5 hr |
| Aug 7, 10:14 PM CDT | Severe Thunderstorm Watch | SPC | Black Hawk, Boone, Bremer, Buena Vista, Butler, Calhoun and 27 more | 6 hr |
| Aug 9, 5:16 AM CDT | Severe Thunderstorm Watch | SPC | Harrison, Monona, Pottawattamie, Shelby | 6 hr |
| Aug 9, 6:54 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Audubon, Black Hawk, Boone, Bremer, Buena Vista and 36 more | 7 hr |
| Aug 9, 10:21 AM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Benton, Buchanan, Cedar, Clayton, Clinton and 9 more | 8 hr |
| Aug 9, 3:44 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 32 more | 6 hr |
| Aug 9, 5:52 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 8 hr |
| Aug 19, 5:32 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 43 more | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Boone County5
- Greene County5
- Buena Vista County4
- Audubon County4
- Black Hawk County4
- Calhoun County4
- Carroll County4
- Cerro Gordo County4
- Crawford County4
- Dallas County4
- Grundy County4
- Guthrie County4
- Hamilton County4
- Hancock County4
- Hardin County4
- Humboldt County4
- Kossuth County4
- Marshall County4
- Palo Alto County4
- Pocahontas County4
- Sac County4
- Story County4
- Tama County4
- Webster County4
- Winnebago County4
- Worth County4
- Wright County4
- Cherokee County3
- Clay County3
- Dickinson County3
- Ida County3
- Woodbury County3
- Bremer County3
- Butler County3
- Emmet County3
- Franklin County3
- Jasper County3
- Polk County3
- Poweshiek County3
- Fremont County3
59 more counties
- Page County3
- Decatur County3
- Ringgold County3
- Taylor County3
- Pottawattamie County3
- Shelby County3
- Adair County3
- Cass County3
- Madison County3
- Lyon County2
- O'Brien County2
- Osceola County2
- Plymouth County2
- Sioux County2
- Allamakee County2
- Chickasaw County2
- Clayton County2
- Fayette County2
- Floyd County2
- Mitchell County2
- Winneshiek County2
- Appanoose County2
- Davis County2
- Lee County2
- Van Buren County2
- Wayne County2
- Harrison County2
- Monona County2
- Mahaska County2
- Marion County2
- Warren County2
- Benton County2
- Buchanan County2
- Cedar County2
- Clinton County2
- Delaware County2
- Dubuque County2
- Iowa County2
- Jackson County2
- Johnson County2
- Jones County2
- Linn County2
- Adams County2
- Clarke County2
- Mills County2
- Montgomery County2
- Union County2
- Howard County1
- Lucas County1
- Monroe County1
- Wapello County1
- Des Moines County1
- Henry County1
- Jefferson County1
- Keokuk County1
- Louisa County1
- Muscatine County1
- Scott County1
- Washington County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.