Alert archive / Wisconsin / Severe Thunderstorm Warnings / 2026
Severe Thunderstorm Warnings in Wisconsin, May 2026
32 severe thunderstorm warnings in May 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 May 2026. Tap one for its archive.
- Severe Thunderstorm Warnings
- 32
- Busiest day
- May 27, 202610 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 |
|---|---|---|---|---|
| May 12, 4:18 PM CDT | Severe Thunderstorm Warning | GRB | Langlade, Oconto | 28 min |
| May 15, 10:54 PM CDT | Severe Thunderstorm Warning | ARX | Crawford, Grant | 51 min |
| May 15, 11:14 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 61 min |
| May 15, 11:40 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Lafayette | 80 min |
| May 16, 12:24 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Rock | 66 min |
| May 16, 1:06 AM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Rock, Walworth | 54 min |
| May 16, 1:20 AM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Sheboygan | 40 min |
| May 17, 10:35 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Iowa, Lafayette | 40 min |
| May 17, 11:09 AM CDT | Severe Thunderstorm Warning | MKX | Dane | 51 min |
| May 17, 11:12 AM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane, Iowa, Sauk | 38 min |
| May 17, 1:27 PM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Sheboygan, Washington | 48 min |
| May 17, 1:58 PM CDT | Severe Thunderstorm Warning | MKX | Sheboygan | 47 min |
| May 17, 3:25 PM CDT | Severe Thunderstorm Warning | GRB | Calumet, Manitowoc | 50 min |
| May 17, 11:29 PM CDT | Severe Thunderstorm Warning | ARX | Clark, Jackson | 18 min |
| May 18, 11:13 PM CDT | Severe Thunderstorm Warning | DLH | Iron, Price | 32 min |
| May 18, 11:34 PM CDT | Severe Thunderstorm Warning | GRB | Oneida, Vilas | 56 min |
| May 26, 5:10 PM CDT | Severe Thunderstorm Warning | GRB | Langlade, Menominee, Shawano | 50 min |
| May 26, 5:24 PM CDT | Severe Thunderstorm Warning | DLH | Sawyer, Washburn | 66 min |
| May 26, 6:37 PM CDT | Severe Thunderstorm Warning | DLH | Sawyer, Washburn | 53 min |
| May 27, 3:27 PM CDT | Severe Thunderstorm Warning | GRB | Langlade, Lincoln, Marathon | 48 min |
| May 27, 3:59 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 46 min |
| May 27, 4:36 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 39 min |
| May 27, 5:00 PM CDT | Severe Thunderstorm Warning | GRB | Portage | 30 min |
| May 27, 5:19 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 26 min |
| May 27, 5:26 PM CDT | Severe Thunderstorm Warning | GRB | Portage | 49 min |
| May 27, 5:49 PM CDT | Severe Thunderstorm Warning | ARX | Clark | 56 min |
| May 27, 6:39 PM CDT | Severe Thunderstorm Warning | ARX | Jackson | 41 min |
| May 27, 6:52 PM CDT | Severe Thunderstorm Warning | MKX | Marquette | 38 min |
| May 27, 6:55 PM CDT | Severe Thunderstorm Warning | GRB | Waushara | 20 min |
| May 27, 7:29 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Marquette, Sauk | 46 min |
| May 27, 7:46 PM CDT | Severe Thunderstorm Warning | ARX | Jackson | 33 min |
| May 27, 8:26 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane, Iowa, Sauk | 20 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Dane County5
- Iowa County4
- Marathon County4
- Langlade County3
- Sheboygan County3
- Columbia County3
- Sauk County3
- Jackson County3
- Grant County2
- Lafayette County2
- Green County2
- Rock County2
- Fond du Lac County2
- Clark County2
- Sawyer County2
- Washburn County2
- Portage County2
- Marquette County2
- Oconto County1
- Crawford County1
- Jefferson County1
- Walworth County1
- Washington County1
- Calumet County1
- Manitowoc County1
- Iron County1
- Price County1
- Oneida County1
- Vilas County1
- Menominee County1
- Shawano County1
- Lincoln County1
- Waushara 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.