CHICAGO (CBS) – Less than two weeks ago, conditions were stormy and humid as the temperature topped 65 degrees.

You can say goodbye to that for the foreseeable future.

This weekend, you’re sure to need a winter coat, and you’re likely to need a snow shovel too. And next week, Jack Frost will be nipping at your nose, ears and extremities.

CBS 2 Meteorologist Megan Glaros says heavy snow will begin falling Friday night, and continue through the day Saturday. Accumulation could amount to a couple of inches when it’s all over.

But in some areas to the north, conditions will be far worse. A winter storm watch is in effect for parts of north central and northwest Illinois, and southern Wisconsin. Snowfall in the areas of Madison, Wisconsin Dells and Lake Geneva could amount to 6 to 8 inches, according to the National Weather Service.

In the Chicago area, the heaver snow should taper off overnight Saturday into Sunday, Glaros says. But on Monday, temperatures will turn bitter cold, with highs in the 20s and overnight lows as frigid as 15 degrees.

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