Alert archive / Iowa / Severe Thunderstorm Warnings / 2011
Severe Thunderstorm Warnings in Iowa, September 2011
24 severe thunderstorm warnings in September 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 severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in September 2011. Tap one for its archive.
- Severe Thunderstorm Warnings
- 24
- Busiest day
- September 3, 201114 severe thunderstorm warnings
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 |
|---|---|---|---|---|
| Sep 2, 2:33 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 27 min |
| Sep 2, 2:56 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 34 min |
| Sep 2, 3:27 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, O'Brien | 33 min |
| Sep 2, 3:40 AM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 35 min |
| Sep 2, 3:49 AM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Palo Alto | 41 min |
| Sep 2, 4:27 AM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth, Palo Alto, Pocahontas | 48 min |
| Sep 2, 5:33 AM CDT | Severe Thunderstorm Warning | DMX | Worth | 27 min |
| Sep 2, 5:46 AM CDT | Severe Thunderstorm Warning | ARX | Mitchell | 44 min |
| Sep 2, 6:15 AM CDT | Severe Thunderstorm Warning | ARX | Howard, Winneshiek | 60 min |
| Sep 2, 7:02 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 58 min |
| Sep 2, 9:01 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 44 min |
| Sep 2, 9:30 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Webster | 45 min |
| Sep 2, 9:40 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Cass, Greene, Guthrie | 65 min |
| Sep 2, 9:43 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 41 min |
| Sep 2, 10:48 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Greene, Guthrie | 42 min |
| Sep 2, 11:02 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Grundy, Marshall, Tama | 46 min |
| Sep 2, 11:25 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Polk, Story | 34 min |
| Sep 2, 11:45 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 45 min |
| Sep 2, 11:50 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware | 55 min |
| Sep 2, 11:58 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 62 min |
| Sep 3, 12:54 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton | 66 min |
| Sep 3, 2:13 AM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 47 min |
| Sep 3, 1:54 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson | 66 min |
| Sep 3, 2:52 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Louisa | 53 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- O'Brien County3
- Clayton County3
- Plymouth County2
- Sioux County2
- Cherokee County2
- Clay County2
- Kossuth County2
- Palo Alto County2
- Winneshiek County2
- Allamakee County2
- Harrison County2
- Pottawattamie County2
- Shelby County2
- Greene County2
- Guthrie County2
- Boone County2
- Dallas County2
- Black Hawk County2
- Bremer County2
- Fayette County2
- Buena Vista County1
- Humboldt County1
- Pocahontas County1
- Worth County1
- Mitchell County1
- Howard County1
- Hamilton County1
- Webster County1
- Audubon County1
- Carroll County1
- Cass County1
- Butler County1
- Grundy County1
- Marshall County1
- Tama County1
- Polk County1
- Story County1
- Buchanan County1
- Delaware County1
- Henry County1
3 more counties
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.