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It’s not the polar vortex, but it’s going to get really cold, Chicago

Updated: January 19, 2014 10:17PM



The polar vortex has retreated north, but temperatures in the Chicago area are expected to hover near zero throughout much of this week, with wind chills dipping as low as minus 15.

The temperature will start to fall Monday as a cold front moves into the area, National Weather Service Meteorologist Ben Deubelbeiss said. The high is expected to be in the 20s Sunday night and temperatures will drop steadily throughout Monday. The day’s low will be in the single digits, with wind chills from 10 to 15 below.

Tuesday, Wednesday and Thursday will have similar highs and lows, with temperatures near zero and double-digit wind chills, Deubelbeiss said.

From Monday evening into early Tuesday, a narrow band of lake-effect snow could leave up to a foot of snow in parts of northwest Indiana. The storm could drop up to two inches of snow an hour in some areas — with near-zero visibility — according to the weather service.

This particular blast of cold air is not caused by the polar vortex, the low-pressure system that typically resides over and around the Arctic Circle but migrated south, that brought days of below-freezing temperatures to the Chicago area.

The new blast of cold is a byproduct of the system that regularly moves through Canada and into the United States, according to the weather service.

By Friday, highs in the area are expected to climb to 24 degrees, falling to 15 at night, forecasts show.

Email: scharles@suntimes.com

Twitter: @samjcharles



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