The Winter Weather Advisory has been extended to include now: Carroll, Ogle, and DeKalb counties, while keeping Jo Daviess, Stephenson, Winnebago, Boone, and McHenry counties in northern Illinois and Green, Rock, and Walworth counties in southern Wisconsin. The advisory will go into effect at 8p/9p, depending on specific location and will last through Wednesday morning.
Cloud cover has been on the increase Tuesday afternoon ahead of light snow showers that are currently moving across the Midwest. There is some dry air to overcome initially, but I anticipate the snow to move in from west to east after 7p/8p, with the bulk of the accumulating snow center around the 11p-2am time frame. While most locations are likely to receive between 1-3 inches, there could be some areas that pick up between 3-4, locally 5, inches wherever any heavy snow banding may occur. I think the best location for this to happen will be centered around the Highway 20 corridor and points north. There may also be a sharp cut-off in snow accumulations down towards I-88.
Most of the snow will be wrapping up by sunrise Wednesday, but a few lingering light snow showers and snow flurries may continue through roughly 8-9a. While the accumulating snow will be done during that time, there are likely to be impacts for the morning commute and you'll want to make sure you give yourself a little extra time. A brief area of high pressure will move in Wednesday afternoon which will give us a little break from some of the cloud cover. Temperatures will warm back into the
mid and upper 20s. Between 6p-8p an Arctic cold front will move in with another batch of snow. This second round will last for a couple hour period but could also come with some wind. As a result, blowing and drifting snow may occur through Wednesday night.
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