Alert archive / Wisconsin / Severe Thunderstorm Warnings / 2026
Severe Thunderstorm Warnings in Wisconsin, September 2026
30 severe thunderstorm warnings in September 2026. 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 2026. Tap one for its archive.
- Severe Thunderstorm Warnings
- 30
- Busiest day
- September 4, 202623 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, 12:10 AM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Trempealeau | 22 min |
| Sep 2, 1:18 AM CDT | Severe Thunderstorm Warning | ARX | Adams | 27 min |
| Sep 2, 1:47 AM CDT | Severe Thunderstorm Warning | ARX | Buffalo, Trempealeau | 58 min |
| Sep 2, 2:25 AM CDT | Severe Thunderstorm Warning | ARX | Buffalo, Jackson, La Crosse, Monroe, Trempealeau | 50 min |
| Sep 2, 5:10 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Calumet, Kewaunee, Manitowoc | 50 min |
| Sep 3, 7:51 AM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Ozaukee, Washington, Waukesha | 54 min |
| Sep 3, 8:05 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Iowa, Lafayette | 40 min |
| Sep 3, 10:25 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Fond du Lac, Green Lake | 35 min |
| Sep 3, 10:53 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Fond du Lac, Washington | 52 min |
| Sep 3, 11:23 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Washington | 67 min |
| Sep 3, 11:45 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Washington | 30 min |
| Sep 4, 12:04 AM CDT | Severe Thunderstorm Warning | GRB | Menominee, Shawano | 41 min |
| Sep 4, 12:04 AM CDT | Severe Thunderstorm Warning | MKX | Dodge, Milwaukee, Ozaukee, Washington, Waukesha | 56 min |
| Sep 4, 12:22 AM CDT | Severe Thunderstorm Warning | GRB | Portage, Waupaca | 53 min |
| Sep 4, 12:38 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac | 52 min |
| Sep 4, 12:43 AM CDT | Severe Thunderstorm Warning | GRB | Calumet, Winnebago | 18 min |
| Sep 4, 12:54 AM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Ozaukee, Washington, Waukesha | 51 min |
| Sep 4, 1:03 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Sheboygan | 42 min |
| Sep 4, 1:06 AM CDT | Severe Thunderstorm Warning | GRB | Portage, Waupaca, Waushara, Winnebago | 39 min |
| Sep 4, 1:11 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Sheboygan | 49 min |
| Sep 4, 1:33 AM CDT | Severe Thunderstorm Warning | GRB | Outagamie, Waupaca, Waushara, Winnebago | 57 min |
| Sep 4, 1:34 AM CDT | Severe Thunderstorm Warning | MKX | Sheboygan | 41 min |
| Sep 4, 1:40 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Green Lake, Marquette | 80 min |
| Sep 4, 1:57 AM CDT | Severe Thunderstorm Warning | GRB | Calumet, Manitowoc | 63 min |
| Sep 4, 2:14 AM CDT | Severe Thunderstorm Warning | MKX | Sheboygan | 16 min |
| Sep 4, 2:37 AM CDT | Severe Thunderstorm Warning | MKX | Dodge, Fond du Lac, Ozaukee, Sheboygan, Washington | 53 min |
| Sep 4, 4:27 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 48 min |
| Sep 4, 4:31 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 27 min |
| Sep 4, 5:07 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 53 min |
| Sep 4, 5:48 PM CDT | Severe Thunderstorm Warning | GRB | Marathon, Portage, Wood | 57 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Washington County7
- Fond du Lac County7
- Dodge County6
- Sheboygan County5
- Ozaukee County4
- Trempealeau County3
- Calumet County3
- Milwaukee County3
- Waukesha County3
- Portage County3
- Waupaca County3
- Winnebago County3
- Marathon County3
- La Crosse County2
- Buffalo County2
- Manitowoc County2
- Green Lake County2
- Waushara County2
- Adams County1
- Jackson County1
- Monroe County1
- Brown County1
- Kewaunee County1
- Dane County1
- Green County1
- Iowa County1
- Lafayette County1
- Menominee County1
- Shawano County1
- Outagamie County1
- Marquette County1
- Grant County1
- Wood County1
Nearby
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.