National Weather Service United States Department of Commerce

Mixed precip continues northwest of Milwaukee early this afternoon. A steady changeover to moderate to heavy snow is ongoing in northwestern areas, with an area of freezing rain & sleet lingering further south and east. All rain lingers in far southeastern Wisconsin. Snow covered roads & reduced visibilities can be expected in areas changing over to snow, with additional icing possible in within the zone of freezing rain and sleet. Avoid travel if possible in areas experiencing wintry precip. A lull in precip will work into areas west of I-39 after 4 PM.
Here is a brief overview of the winter storm passing the region through Monday. Main update is upgrade to Winter Storm Warning for much of the area while a Winter Weather Advisory has been issued for southeast WI for this afternoon/evening into Monday.
A Winter Weather Advisory is in effect now through 7 PM for Iowa, Dane, and Washington county for ongoing freezing rain and sleet. A Winter Storm Warning is in effect now through 4pm Monday for Sauk, Columbia, Marquette, Green Lake, Fond du Lac, Sheboygan counties. A Winter Storm Warning in effect for 7 PM today to 4 PM Monday for Dodge, Jefferson, Lafayette, Green, Rock counties. A Winter Weather Advisory is in effect from 10 pm Sun to 4 PM Monday for Ozaukee, Waukesha, Milwaukee, Walworth, Racine and Kenosha counties.
Increased freezing rain will lead to ice accumulation across the north through early afternoon. Between a tenth and quarter inch of ice in possible in spots.
Snow totals of 6–10 inches with highest amounts northwest of a line from Fond du Lac to Darlington. Lower snowfall for southeastern WI with only 2-5 inches. The snow will start off wetter, which may stick more to trees and powerlines, but as temps drop, expect it to transition toward drier snow, making it more susceptible to blowing and drifting with the stronger winds.