Active Weather Alerts
Severe Thunderstorm Watch
Issued: 10:23 PM Aug. 18, 2026 – National Weather Service
WI . WISCONSIN COUNTIES INCLUDED ARE CALUMET COLUMBIA CRAWFORD DANE DODGE FOND DU LAC GRANT GREEN GREEN LAKE IOWA JEFFERSON LAFAYETTE MARQUETTE OZAUKEE RICHLAND ROCK SAUK SHEBOYGAN WALWORTH WASHINGTON WAUKESHA WAUSHARA WINNEBAGO
Severe Thunderstorm Warning
Issued: 10:09 PM Aug. 18, 2026 – National Weather Service
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR COLUMBIA...NORTHERN DANE AND SOUTHEASTERN SAUK COUNTIES... At 509 PM CDT, severe thunderstorms were located along a line extending from 7 miles east of Wisconsin Dells to near Lake Wisconsin to 7 miles northwest of Mazomanie, moving east at 50 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. Locations impacted include... Madison, Sun Prairie, Middleton, Waunakee, Portage, Windsor, Columbus, Prairie Du Sac, Sauk City, Lake Wisconsin, Deforest, Cross Plains, Lodi, Poynette, Pardeeville, Randolph, Fall River, Mazomanie, Black Earth, and Rio. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && TORNADO...POSSIBLE; HAIL THREAT...RADAR INDICATED; MAX HAIL SIZE...1.00 IN; WIND THREAT...RADAR INDICATED; MAX WIND GUST...60 MPH
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