A strong late season winter storm will begin to impact the region Wednesday evening before beginng to exit the area throughout the day Friday. A mix of wet snow, sleet, freezing rain, and rain will be possible for much of the area during this event. Here is the timing of this system across northeast Wisconsin.
This evening/tonight: A band of wet snow will move northward through the overnight. The snow could fall heavy at times. Areas south of the Fox Valley could begin to see a transition from snow over to a wintry mix by the early morning hours on Thursday.
Thursday morning: Wet snow will continue to push northward across the area creating slick road conditions for the morning commute. A widespread 2-5″ of slushy snow will be on the ground by the late morning before we begin to transition over to sleet and freezing rain. Strong east winds will develop with gusts over 35 mph possible.
Thursday afternoon/evening: East winds will remain quite strong during this time as the storm system approaches western Iowa. A wintry mix will transition over to rain showers by the evening on Thursday for areas mainly south of Hwy. 64. There could be a few rumbles of thunder with the rain Thursday evening.
Thursday night/Friday: Drier air will put an end to the heaviest precipitation Thursday night and through much of the day Friday. Pockets of drizzle will be possible Thursday night with a spotty rain or snow showers on Friday as the main storm system moves over the western portions of Lake Superior. Breezy southwest winds will develop on Friday especially for areas near Green Bay and to the south.