Flash Flood Warning Issued for Jefferson, Rock, and Walworth Counties in Wisconsin
This alert is no longer in effect.
NOAA issued it on April 25, 2026, 4 months ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
A Flash Flood Warning is in effect for Jefferson, Rock, and Walworth counties in Wisconsin until 10:15 PM CDT, with heavy rain causing potential flooding in urban areas and low-lying regions.
Read this weather record in 30 seconds
- Record type
- Flash Flood Warning
- Affected area
- Southeastern Wisconsin
- Issued
- April 25, 2026
- Issuing authority
- NWS Milwaukee Sullivan WI
Flood notices turn on location and timing. Treat the named area as this record's scope; do not assume nearby counties, parishes, or waterways were included.
Record status: historical. It was issued 4 months ago; use the issuing agency's live warning service for current conditions in Southeastern Wisconsin.
Alert Details
The National Weather Service in Milwaukee/Sullivan WI has issued a Flash Flood Warning. This alert is effective from 7:01 PM CDT on April 17, 2026.
Affected Areas
The warning affects Jefferson County, Rock County, and Walworth County in Wisconsin. Specific locations include Whitewater, Palmyra, Lake Koshkonong, Richmond, La Grange, Hebron, Millard, and Lima Center.
What You Should Do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
Expected Conditions
Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1.5 and 2.5 inches of rain have fallen, with additional rainfall amounts of 0.5 to 1.5 inches possible. Flash flooding is ongoing or expected, affecting small creeks and streams, urban areas, highways, streets, underpasses, and other poor drainage and low-lying areas.
Timeline
The alert is effective from 7:01 PM CDT on April 17, 2026, and expires at 10:15 PM CDT on the same day.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,007 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to April 25, 2026.
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Common questions about this NWS weather alert.