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Despite a high temperature of 39 degrees Wednesday, the Chicago area Thursday started out frigid, with temperatures in the low teens in most parts — and wind chills made the air feel even colder. But how exactly is “wind chill” defined, and how cold does it feel?

Kevin Jeanes has the latest forecast for the Chicago area.

Alicia Roman has the latest forecast.

Thursday morning wind chills drop below zero.

A fast-moving cold front could bring hazardous snow and gusty winds to the Chicago area, and it’s already having big impacts in Wisconsin.

A fast-approaching cold front could produce “bursts of snow” on Wednesday evening in the Chicago area, with squall lines producing hazardous travel conditions at times.

Warmer temperatures accompanied by blustery conditions and gusty snow showers were in Chicago’s Wednesday forecast, the NBC 5 Storm Team said, followed by colder air and below-zero wind chills.

Alicia Roman has the latest forecast.

Snow and a little rain arrives for the afternoon commute

The Chicago area could have its evening commute impacted by an “Alberta Clipper” system that will bring snow and plummeting temperatures to the region.

Alicia Roman has the latest forecast.