National Weather Service United States Department of Commerce

There is a threat for freezing rain late tonight (midnight-6 AM) across southern Wisconsin. There is some question as to whether any precipitation will reach the ground due to a layer of dry air near the surface. Surface temperatures are expected to be just below freezing, so if precipitation is able to reach the ground, it will freeze on contact. This will be especially true of elevated and untreated surfaces. Areas north of a line from Portage to Milwaukee have the best chance for a glaze by tomorrow morning.