Southwest winds Tuesday night will keep temperatures in the upper teens and low 20's and bring highs into the upper 30's Wednesday. Most of Wednesday afternoon will be dry, but the added moisture from the southwest wind will allow more cloud cover to develop by Wednesday evening, along with the potential for locally dense fog Wednesday night. 
A weak upper level low will move in from the west Wednesday evening and this may be enough to allow drizzle to develop over parts of northern Illinois and southern Wisconsin. Temperatures will initially be above freezing, but could fall close to freezing Thursday morning. If the drizzle is still around during that time, then there would be a small chance for freezing drizzle early Thursday. But that threat looks low at this point.
Light rain showers will develop during the day Thursday ahead of a cold front that will bring temperatures down into the 20's Thursday night. A transition over to a light mix Thursday evening will be possible as the atmosphere cools, but no accumulation is expected.
During the evening Wednesday and through the first half of Thursday is when we'll most likely see a good amount of the snow melt away. Normally this wouldn't be too much of a concern - other than creating a very sloppy mess - but temperatures will fall below freezing Thursday night and Friday morning. The sub-freezing air mass will allow some of the slush to freeze on the roads by Friday morning, causing roads to become slick during the morning commute.
Temperatures on Friday will only warm into the mid 20's, but we'll be back into the 30's by the end of the weekend.
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