Isolated to scattered thunderstorms - possibly strong or severe - will tracked towards the southeast. The favored zone of development right now is from New Glarus to Janesville. I expect this activity to continue during the mid day hours.
Scattered showers and storms to redevelop near the WI/IL border overnight into Friday morning. This activity will move slowly north into central Wisconsin tomorrow.
EARLY THIS MORNING
Tonight we will see activity flare up along or south of the WI/IL border, perhaps a strong storm or two but widespread severe weather not expected.