Arctic air began to chill Chicago overnight, with temperatures dropping from a high of 34 Monday to 3 degrees before dawn Tuesday.
All of northeast Illinois, northwest Indiana and southern Wisconsin was under a wind chill warning starting 6 p.m. Tuesday until noon Thursday, with a wind chill advisory that started at 4 a.m. Tuesday in effect until the warning period begins.
Forecasters say the cold is expected to set records and could approach Chicago's coldest temperature ever recorded at O'Hare, 27 degrees below zero in 1985.
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