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Heat Cranks Up, Dragging in Strong Storms and Flooding Risks

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Heat Cranks Up, Dragging in Strong Storms and Flooding Risks

Aug 8, 2025, 11:29 AM CST

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MADISON, Wis. (WMDX) – Thunderstorms are in the batter’s box, ready to swing into the high heat and humidity that blankets Wisconsin.

Heat Advisories are issued for portions of the Fox Valley and places northwest in the state for Friday. Temperatures will soar to the low 90s and, factoring in the high humidity, it’ll feel closer to 100 degrees.

Low pressure will drape a cold front through the state starting Friday. Thunderstorms will be the theme of the weekend in Wisconsin. Hazards of flooding, damaging high winds and hail arrive this weekend as well.

Storm Prediction Center Severe Thunderstorm Risk for Friday August 8, 2025.

Starting midday Friday, Superior, Hayward, Ashland and northeast Northwoods are in the bullseye. Another round overnight is expected as well. There will be some relief up north, with a dry weekend likely.

Storm Prediction Center Severe Thunderstorm Risk for Saturday August 9, 2025.

Meanwhile south in the state, the heat builds to the 90s again on Sunday. Central Wisconsin, Madison and Milwaukee has a shot at strong to severe storms that afternoon. Gusts could reach up to 70mph and rainfall totals could approach 3-5″ in some places.

Weather Prediction Center Excessive Rainfall Risk for Saturday August 9, 2025.

Current data suggests that the front will stall and sit over the southern parts of Wisconsin through Monday, sending more waves of rain and thunder. This is when flooding may become a big concern.

Possible rainfall totals according to model data 12Z GFS.

A Flood Watch starts Saturday 4 PM and lasts through Monday 7 AM.

River Levels and Flood Watch

Be sure to have an umbrella and rainboots nearby. Prepare for storms by getting flashlights and emergency gear in your safe place. Make sure you have a way to be warned, and stay weather savvy.

Meteorologist Brittney Merlot’s forecast for Madison on John & Gordy, Fri. Aug 8, 2025.

If you are planning to cool off from the heat in the water this weekend, there’s a moderate swim risk on Lake Michigan beaches. You’ll want to know, what drownings really look like, as rip currents and waves may rapidly grow in these conditions.

National Weather Service
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