Alert archive / Iowa / Severe Thunderstorm Watches / 2021
Severe Thunderstorm Watches in Iowa, September 2021
1 severe thunderstorm watches in September 2021. 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 2021. Tap one for its archive.
- Severe Thunderstorm Watches
- 1
- Busiest day
- September 20, 20211 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 20, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Allamakee, Appanoose, Benton, Black Hawk and 56 more | 7 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Adair County1
- Adams County1
- Allamakee County1
- Appanoose County1
- Benton County1
- Black Hawk County1
- Boone County1
- Bremer County1
- Buchanan County1
- Butler County1
- Cedar County1
- Cerro Gordo County1
- Chickasaw County1
- Clarke County1
- Clayton County1
- Dallas County1
- Davis County1
- Decatur County1
- Delaware County1
- Dubuque County1
- Fayette County1
- Floyd County1
- Franklin County1
- Greene County1
- Grundy County1
- Guthrie County1
- Hamilton County1
- Hancock County1
- Hardin County1
- Howard County1
- Humboldt County1
- Iowa County1
- Jasper County1
- Jefferson County1
- Johnson County1
- Jones County1
- Keokuk County1
- Linn County1
- Lucas County1
- Madison County1
22 more counties
- Mahaska County1
- Marion County1
- Marshall County1
- Mitchell County1
- Monroe County1
- Polk County1
- Poweshiek County1
- Ringgold County1
- Story County1
- Tama County1
- Taylor County1
- Union County1
- Van Buren County1
- Wapello County1
- Warren County1
- Washington County1
- Wayne County1
- Webster County1
- Winnebago County1
- Winneshiek County1
- Worth County1
- Wright County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.