Two inches of snow are expected around the city, but steady snow for the morning commute will create slick spots, Mowry said, issuing an AccuWeather Alert.
There could be some 3-inch totals south of Chicago.
Snow will start around 3 a.m. and continue until about 3 p.m., Mowry said.
The high Friday is 30 degrees, with a low of 22.
There's also a chance for snow Sunday, but only a dusting of about 1-inch is expected, he said.