If outdoors, consider seeking shelter inside a building.

At 508 PM CDT, Doppler radar was tracking strong thunderstorms along a line extending from near Rio to 6 miles southwest of Columbus to near Cottage Grove. Movement was east at 35 mph. HAZARD...Wind gusts up to 50 mph and penny size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Watertown, Beaver Dam, Waupun, Jefferson, Lake Mills, Mayville, Columbus, Marshall, Horicon, Waterloo, Juneau, Johnson Creek, Deerfield, Fall River, Cambridge, Hustisford, Iron Ridge, Lac La Belle, Lake Ripley, and Burnett. This includes the following highways... U.S. Highway 151 between mile markers 114 and 145. Interstate 94 between mile markers 251 and 278. Wisconsin Highway 26 between mile markers 28 and 53.