A Winter Weather Advisory has been issued for Winnebago, Boone, McHenry, Ogle and DeKalb counties in Northern Illinois and for Green and Rock counties in Southern Wisconsin. A Winter Storm Warning continues for Walworth county in Southeastern Wisconsin.
A transition to snow has begun across Wisconsin and will continue south in Northern Illinois through early afternoon. Accumulations will likely range from 2"-4" where the snow has already started with lesser amounts outside of the advisory areas. Once the snow begins it will be quick and heavy for the first hour or two which may reduce visibility for a time early this afternoon. Accumulations of half an inch to an inch have already been reported in McHenry and Lake counties in Northeast Illinois. Use caution if headed out later this afternoon as the heaviest of the snow will occur north of Highway 20. The snow will begin to taper off around 6pm/7pm.