The primary severe weather threat tonight will be large hail.
By Sunday afternoon, the warm front will have lifted well north of the area, allowing a warm and humid airmass to settle over southern Wisconsin. Clearing skies behind the early morning thunderstorms should allow temperatures to climb into the lower 80s by Sunday afternoon. Dew points will also reach the lower to mid 60s. The last time the temperatures reached 80 or higher was back on October 10, 2010 at Milwaukee, and October 11, 2010 at Madison.
As low pressure strengthens and moves across east central Minnesota and northern Wisconsin Sunday afternoon and evening, it will drag a cold front across the region, interacting with the unstable airmass and generating another round of thunderstorms. These storms will likely reach severe levels, with a threat of large hail, widespread damaging winds and strong tornadoes.
Please check back for further updates on this potential widespread severe weather outbreak for Sunday afternoon and evening.