National Weather Service United States Department of Commerce

A broken a line of storms will move in from the west overnight. There is uncertainty with how well this will hold together as it moves east, with severe potential generally trending down by this time. However, heavy rain and strong winds will be possible, particularly across central and north-central WI through 3:00 AM or so.
Rain and thunderstorms will move across from west to east overnight. The greatest risk of strong or severe storms occurs over central and north-central WI through approx. 3:00 AM. Storms will weaken significantly by the time they reach eastern WI. Main risks are wind gusts to 60 mph and heavy rain.