Alert archive / Iowa / Severe Thunderstorm Watches / 2011
Severe Thunderstorm Watches in Iowa, September 2011
3 severe thunderstorm watches 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 watches reaches back to 1997.
Severe Thunderstorm Watches by county
Each county as a circle sized by its count in September 2011. Tap one for its archive.
- Severe Thunderstorm Watches
- 3
- Busiest day
- September 3, 20112 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 |
|---|---|---|---|---|
| Sep 2, 3:48 AM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 15 more | 6 hr |
| Sep 2, 10:23 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Benton, Black Hawk, Boone, Buchanan, Cass and 26 more | 6 hr |
| Sep 3, 12:48 AM CDT | Severe Thunderstorm Watch | SPC | Clayton, Fayette | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Clayton County2
- Fayette County2
- Allamakee County1
- Bremer County1
- Butler County1
- Cerro Gordo County1
- Chickasaw County1
- Emmet County1
- Floyd County1
- Franklin County1
- Hancock County1
- Howard County1
- Humboldt County1
- Kossuth County1
- Mitchell County1
- Palo Alto County1
- Pocahontas County1
- Winnebago County1
- Winneshiek County1
- Worth County1
- Wright County1
- Adair County1
- Benton County1
- Black Hawk County1
- Boone County1
- Buchanan County1
- Cass County1
- Cedar County1
- Clinton County1
- Dallas County1
- Delaware County1
- Dubuque County1
- Greene County1
- Grundy County1
- Guthrie County1
- Hardin County1
- Iowa County1
- Jackson County1
- Jasper County1
- Johnson 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.