Alert archive / Iowa / Severe Thunderstorm Warnings / 2020
Severe Thunderstorm Warnings in Iowa, September 2020
20 severe thunderstorm warnings in September 2020. 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 2020. Tap one for its archive.
- Severe Thunderstorm Warnings
- 20
- Busiest day
- September 6, 202018 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 6, 12:39 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 36 min |
| Sep 6, 12:56 AM CDT | Severe Thunderstorm Warning | ARX | Fayette | 49 min |
| Sep 6, 12:58 AM CDT | Severe Thunderstorm Warning | DVN | Buchanan | 62 min |
| Sep 6, 1:32 AM CDT | Severe Thunderstorm Warning | DMX | Emmet, Hancock, Kossuth, Winnebago | 43 min |
| Sep 6, 1:35 AM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware | 55 min |
| Sep 6, 1:41 AM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard | 49 min |
| Sep 6, 2:13 AM CDT | Severe Thunderstorm Warning | ARX | Fayette, Winneshiek | 47 min |
| Sep 6, 2:14 AM CDT | Severe Thunderstorm Warning | DMX | Emmet, Hancock, Kossuth, Winnebago | 46 min |
| Sep 6, 2:17 AM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jones, Linn | 58 min |
| Sep 6, 2:21 AM CDT | Severe Thunderstorm Warning | DMX | Bremer | 19 min |
| Sep 6, 2:56 AM CDT | Severe Thunderstorm Warning | ARX | Clayton | 49 min |
| Sep 6, 2:57 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Kossuth, Winnebago, Worth | 48 min |
| Sep 6, 3:14 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Kossuth, Wright | 46 min |
| Sep 6, 3:14 AM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jones | 32 min |
| Sep 6, 3:40 AM CDT | Severe Thunderstorm Warning | DMX | Butler, Cerro Gordo, Franklin, Hancock, Hardin, Wright | 50 min |
| Sep 6, 3:42 AM CDT | Severe Thunderstorm Warning | ARX | Floyd | 48 min |
| Sep 6, 4:04 AM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 41 min |
| Sep 6, 4:28 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Delaware, Jones, Linn | 47 min |
| Sep 7, 8:17 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Union | 21 min |
| Sep 8, 2:16 AM CDT | Severe Thunderstorm Warning | DVN | Des Moines | 44 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Hancock County5
- Kossuth County4
- Delaware County4
- Winnebago County3
- Jones County3
- Cerro Gordo County3
- Bremer County2
- Fayette County2
- Buchanan County2
- Emmet County2
- Dubuque County2
- Linn County2
- Wright County2
- Black Hawk County1
- Chickasaw County1
- Howard County1
- Winneshiek County1
- Clayton County1
- Worth County1
- Butler County1
- Franklin County1
- Hardin County1
- Floyd County1
- Clinton County1
- Scott County1
- Cedar County1
- Clarke County1
- Decatur County1
- Ringgold County1
- Union County1
- Des Moines County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.