CHICAGO (CBS) -- A Wind Chill Advisory is in effect for western counties 9 p.m. Thursday to 9 a.m. Friday.
Wind chills will drop to -25.
This will be the coldest night of this three-day cold snap. As high pressure drifts overhead, the core of the Arctic air parks overhead. There will be more day of brutal cold on Friday with wind chills below zero.
TONIGHT: Bitter cold. Lows close to zero with wind chills 10 to 20 below.
FRIDAY: Mostly sunny. High 14. Wind chills to 10 below.
SATURDAY: Light wintry mix by evening. High 33.
SUNDAY: Sunny. Morning high of 25. Falling temperatures through the day.
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