Southern Wisconsin severe storms, heavy rain, flooding possible
Southern Wisconsin is dealing with yet another active weather day as thunderstorms push through the region.
The National Weather Service had issued a severe thunderstorm watch for southeast Wisconsin, which has since been canceled.
A severe thunderstorm warning was in effect until 1:15 p.m. for Jefferson County, and 1:45 p.m. for Waukesha County.
Severe thunderstorm watch (Aug. 18, 2025)
Monitoring storms
What we know:
A line of storms moved into Iowa County late Monday morning, but limited instability kept the risk of widespread severe weather lower than expected for the morning hours. However, a few storms could produce gusty winds or a brief spin-up later Monday and Monday night, mainly along the Wisconsin–Illinois border where sunshine is helping the atmosphere recover.
Storm Risks Today:
Damaging Winds: Stronger storms possible with wind gusts exceeding 55mph.
Heavy Rain: With tropical moisture in place and already saturated ground, multiple rounds of storms could trigger localized flooding in cities and rivers.
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Lightning: Remains a risk for outdoor workers, travelers, and events.
Storm Impacts:
Commutes: Rain and storms could slow afternoon/evening drive, especially south of I-94.
Air Travel: Potential delays if storms redevelop near Milwaukee or Chicago corridors.
Outdoor Events: Lightning and gusty winds remain risks for fairs, festivals, and sports.
Flooding: Localized urban flooding possible with repeated downpours; rivers may rise.
Lake Michigan: Waves 3–6 feet create dangerous swimming and boating conditions.
What's next:
Storm chances continue into early Tuesday morning as another disturbance swings through the region, but the activity should clear by late evening with the passing cold front.
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Drier, cooler air arrives midweek, bringing highs in the 70s and lower humidity.
The Source: The information in this post was provided by the FOX6 Weather Experts, National Weather Service and SPC.