A winter storm will begin to coat Chicago, Illinois, and the neighboring area with one inch of snow per hour Friday night into Saturday. The northeastern part of Illinois is under a level four winter storm threat from the National Weather Service.

Forecasters are anticipating a winter storm to begin late Friday, with snow expected to fall up to an inch per hour into Saturday.

The NWS warned that travelers should consider delaying travel unless it's "absolutely necessary," with driving expected to be very difficult to impossible.

Temperatures in the Chicago area are forecast to dip into the 30s starting Wednesday, and wind chills could fall to a low of 6 degrees Thursday morning, according to the National Weather Service.

Wintry weather across Chicago continues to cause issues at both of its city airports on one of the busiest travel days of the year.

Accumulating snow is likely over the Thanksgiving holiday weekend, but there are still questions as to how much snow the Chicago area will see.

The trip home from Thanksgiving for millions of travelers in the central U.S. will be disrupted by a "significant winter storm," forecasters said.