Severe Thunderstorm Warning for Rock and Walworth Counties, WI
This alert is no longer in effect.
NOAA issued it on August 11, 2026, 12 days 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.
NWS Milwaukee/Sullivan has issued a Severe Thunderstorm Warning for southwestern Walworth County and southeastern Rock County until 3:30 AM CDT August 11.
Read this weather record in 30 seconds
- Record type
- Severe Thunderstorm Warning
- Affected area
- Southern Wisconsin
- Issued
- August 11, 2026
- Issuing authority
- NWS Milwaukee/Sullivan WI
Storm notices can cover different combinations of wind, hail, lightning, and rainfall. Use the original notice for the hazards and boundaries attached to this specific record.
Record status: historical. It was issued 12 days ago; use the issuing agency's live warning service for current conditions in Southern Wisconsin.
Alert Details
Severe Thunderstorm Warning issued by NWS Milwaukee/Sullivan WI. Effective from 2026-08-11T03:02:00-05:00 until 2026-08-11T03:30:00-05:00. Alert type code: SVR.
Affected Areas
Southwestern Walworth County in southeastern Wisconsin and southeastern Rock County in south central Wisconsin. Locations impacted include Delavan, Williams Bay, Walworth, Clinton, Fontana-On-Geneva Lake, Sharon, Darien, Tiffany, Allens Grove, Avalon, Shopiere, Emerald Grove, Foxhollow, and Delavan Lake.
What You Should Do
For your protection move to an interior room on the lowest floor of a building.
Expected Conditions
At 3:02 AM CDT, a severe thunderstorm was located over Clinton, or 10 miles east of Beloit, moving southeast at 25 mph. Hazards include 60 mph wind gusts and quarter size hail (1.00 inch). Radar indicated. Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees.
Timeline
The warning is effective immediately from 3:02 AM CDT and expires at 3:30 AM CDT on August 11, 2026.
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 (1,034 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 11, 2026.
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