⚠️ Severe Thunderstorm Warning – Columbia, WI; Dane, WI; Sauk, WI – Tuesday, August 18, 2026

Severe Thunderstorm Warning issued August 18 at 5:08PM CDT until August 18 at 6:00PM CDT by NWS Milwaukee/Sullivan WI

Details

SVRMKX

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for…
Columbia County in south central Wisconsin…
Northern Dane County in south central Wisconsin…
Southeastern Sauk County in south central Wisconsin…

* Until 600 PM CDT.

* At 507 PM CDT, severe thunderstorms were located along a line
extending from 6 miles east of Wisconsin Dells to near Baraboo to 8
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.

Other landmarks included are the following Locations Gibraltar Rock
Natural Area County Park, Pine Island State Wildlife Area, Historic
Indian Agency House, French Creek Wildlife Area, and Alliant Energy
Portage Power Plant.

Instructions

For your protection move to an interior room on the lowest floor of a
building.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.