Alert archive / Wisconsin / Flash Flood Warnings / 2026
Flash Flood Warnings in Wisconsin, April 2026
23 flash flood warnings in April 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 flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in April 2026. Tap one for its archive.
- Flash Flood Warnings
- 23
- Busiest day
- April 17, 20267 flash flood 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 |
|---|---|---|---|---|
| Apr 3, 8:58 PM CDT | Flash Flood Warning | ARX | La Crosse, Monroe, Vernon | 4 hr |
| Apr 13, 5:22 PM CDT | Flash Flood Warning | GRB | Marathon, Portage, Wood | 5 hr |
| Apr 13, 8:06 PM CDT | Flash Flood Warning | GRB | Marathon, Outagamie, Portage, Shawano, Waupaca | 8 hr |
| Apr 13, 10:01 PM CDT | Flash Flood Warning | GRB | Brown, Door, Kewaunee, Oconto, Outagamie | 6 hr |
| Apr 13, 10:04 PM CDT | Flash Flood Warning | ARX | Monroe | 3 hr |
| Apr 13, 10:54 PM CDT | Flash Flood Warning | GRB | Brown, Calumet, Kewaunee, Manitowoc, Outagamie, Winnebago | 5 hr |
| Apr 14, 10:16 AM CDT | Flash Flood Warning | GRB | Waupaca | 6 hr |
| Apr 14, 6:11 PM CDT | Flash Flood Warning | MKX | Dane, Dodge, Jefferson | 4 hr |
| Apr 14, 7:10 PM CDT | Flash Flood Warning | MKX | Dodge, Milwaukee, Ozaukee, Washington, Waukesha | 3 hr |
| Apr 14, 7:58 PM CDT | Flash Flood Warning | MKX | Milwaukee, Waukesha | 3 hr |
| Apr 14, 9:11 PM CDT | Flash Flood Warning | GRB | Brown | 3 hr |
| Apr 15, 7:26 PM CDT | Flash Flood Warning | MKX | Dane, Green, Jefferson, Lafayette, Rock, Walworth | 3 hr |
| Apr 15, 8:03 PM CDT | Flash Flood Warning | MKX | Dodge, Jefferson, Milwaukee, Ozaukee, Washington, Waukesha | 3 hr |
| Apr 15, 8:52 PM CDT | Flash Flood Warning | MKX | Kenosha, Racine, Rock, Walworth | 3 hr |
| Apr 17, 4:00 PM CDT | Flash Flood Warning | MKX | Lafayette | 3 hr |
| Apr 17, 4:10 PM CDT | Flash Flood Warning | GRB | Marathon, Wood | 5 hr |
| Apr 17, 5:15 PM CDT | Flash Flood Warning | MKX | Green, Lafayette | 4 hr |
| Apr 17, 5:19 PM CDT | Flash Flood Warning | MKX | Iowa | 3 hr |
| Apr 17, 6:08 PM CDT | Flash Flood Warning | MKX | Green, Rock | 3 hr |
| Apr 17, 6:34 PM CDT | Flash Flood Warning | MKX | Rock | 3 hr |
| Apr 17, 6:52 PM CDT | Flash Flood Warning | GRB | Langlade, Marathon, Menominee, Shawano | 2 hr |
| Apr 17, 7:01 PM CDT | Flash Flood Warning | MKX | Jefferson, Rock, Walworth | 2 hr |
| Apr 17, 7:43 PM CDT | Flash Flood Warning | MKX | Jefferson, Milwaukee, Racine, Walworth, Waukesha | 2 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Jefferson County5
- Rock County5
- Marathon County4
- Milwaukee County4
- Waukesha County4
- Walworth County4
- Outagamie County3
- Brown County3
- Dodge County3
- Green County3
- Lafayette County3
- Monroe County2
- Portage County2
- Wood County2
- Shawano County2
- Waupaca County2
- Kewaunee County2
- Dane County2
- Ozaukee County2
- Washington County2
- Racine County2
- La Crosse County1
- Vernon County1
- Door County1
- Oconto County1
- Calumet County1
- Manitowoc County1
- Winnebago County1
- Kenosha County1
- Iowa County1
- Langlade County1
- Menominee 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.