WGN Radio 720 - Chicago's Very Own
The Chicago Skyline sits as a backdrop as fog drifts across Monroe Harbor with temperatures well below zero and wind chills expected to reach 40 to 50 below, Monday, Jan. 6, 2014, in Chicago. A whirlpool of frigid, dense air known as a “polar vortex” descended Monday into much of the U.S. (AP Photo/Charles Rex Arbogast)
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