Alert archive / Iowa / Tornado Watches / 2011
Tornado Watches in Iowa, May 2011
8 tornado watches in May 2011. 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 tornado watches reaches back to 1997.
Tornado Watches by county
Each county as a circle sized by its count in May 2011. Tap one for its archive.
- Tornado Watches
- 8
- Busiest day
- May 22, 20112 tornado 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 |
|---|---|---|---|---|
| May 11, 2:53 PM CDT | Tornado Watch | SPC | Adair, Adams, Appanoose, Audubon, Boone, Carroll and 33 more | 6 hr |
| May 12, 2:37 PM CDT | Tornado Watch | SPC | Harrison, Monona, Shelby | 7 hr |
| May 22, 12:07 PM CDT | Tornado Watch | SPC | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 7 hr |
| May 22, 12:51 PM CDT | Tornado Watch | SPC | Appanoose, Benton, Black Hawk, Bremer, Buchanan, Butler and 35 more | 10 hr |
| May 25, 1:22 AM CDT | Tornado Watch | SPC | Lee | 7 hr |
| May 25, 2:31 PM CDT | Tornado Watch | SPC | Des Moines, Henry, Lee, Louisa, Van Buren | 7 hr |
| May 29, 7:16 PM CDT | Tornado Watch | SPC | Fremont, Harrison, Mills, Montgomery, Pottawattamie, Shelby | 4 hr |
| May 30, 8:43 PM CDT | Tornado Watch | SPC | Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux | 5 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Harrison County3
- Shelby County3
- Lee County3
- Appanoose County2
- Davis County2
- Fremont County2
- Jasper County2
- Lucas County2
- Mahaska County2
- Marion County2
- Marshall County2
- Mills County2
- Monona County2
- Monroe County2
- Montgomery County2
- Pottawattamie County2
- Poweshiek County2
- Tama County2
- Wapello County2
- Wayne County2
- Des Moines County2
- Henry County2
- Louisa County2
- Van Buren County2
- Adair County1
- Adams County1
- Audubon County1
- Boone County1
- Carroll County1
- Cass County1
- Clarke County1
- Crawford County1
- Dallas County1
- Decatur County1
- Greene County1
- Guthrie County1
- Madison County1
- Page County1
- Polk County1
- Ringgold County1
42 more counties
- Story County1
- Taylor County1
- Union County1
- Warren County1
- Allamakee County1
- Chickasaw County1
- Clayton County1
- Fayette County1
- Floyd County1
- Howard County1
- Mitchell County1
- Winneshiek County1
- Benton County1
- Black Hawk County1
- Bremer County1
- Buchanan County1
- Butler County1
- Cedar County1
- Cerro Gordo County1
- Clinton County1
- Delaware County1
- Dubuque County1
- Franklin County1
- Grundy County1
- Hardin County1
- Iowa County1
- Jackson County1
- Jefferson County1
- Johnson County1
- Jones County1
- Keokuk County1
- Linn County1
- Muscatine County1
- Scott County1
- Washington County1
- Worth County1
- Clay County1
- Dickinson County1
- Lyon County1
- O'Brien County1
- Osceola County1
- Sioux County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20102012
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.