Alert archive / Iowa / Severe Thunderstorm Warnings / 2021
Severe Thunderstorm Warnings in Iowa, September 2021
13 severe thunderstorm warnings 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 warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in September 2021. Tap one for its archive.
- Severe Thunderstorm Warnings
- 13
- Busiest day
- September 20, 20216 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 13, 10:18 PM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford | 27 min |
| Sep 17, 12:29 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 46 min |
| Sep 17, 12:36 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux | 54 min |
| Sep 17, 1:11 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, Ida, O'Brien, Plymouth and 2 more | 49 min |
| Sep 17, 1:23 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux | 67 min |
| Sep 20, 3:38 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison, Union, Warren | 52 min |
| Sep 20, 4:23 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Lucas, Marion, Warren | 52 min |
| Sep 20, 4:25 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Floyd, Howard, Mitchell | 50 min |
| Sep 20, 4:57 PM CDT | Severe Thunderstorm Warning | DMX | Lucas, Marion, Monroe, Warren | 48 min |
| Sep 20, 6:34 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Wayne | 41 min |
| Sep 20, 6:52 PM CDT | Severe Thunderstorm Warning | DVN | Delaware | 38 min |
| Sep 20, 7:10 PM CDT | Severe Thunderstorm Warning | DMX | Davis | 35 min |
| Sep 20, 7:13 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Keokuk, Washington | 47 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Sioux County4
- Clay County3
- O'Brien County3
- Warren County3
- Plymouth County2
- Dickinson County2
- Lyon County2
- Osceola County2
- Clarke County2
- Lucas County2
- Marion County2
- Davis County2
- Carroll County1
- Crawford County1
- Buena Vista County1
- Cherokee County1
- Ida County1
- Woodbury County1
- Madison County1
- Union County1
- Chickasaw County1
- Floyd County1
- Howard County1
- Mitchell County1
- Monroe County1
- Appanoose County1
- Wayne County1
- Delaware County1
- Henry County1
- Jefferson County1
- Keokuk County1
- Washington 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. Rebuilt daily.