The National Weather Service expanded its previously issued Wind Chill Advisory Sunday morning, to include the City of Chicago and extended the timeframe for which residents should be aware of dangerous temperatures that feel well below zero.
A Wind Chill Advisory in effect for Winnebago, Boone, McHenry, Lake, Ogle, Lee, DeKalb, and Kane counties beginning at midnight Saturday night has been extended. It was originally scheduled to end at 11 a.m. Sunday morning, but the advisory will now remain in effect until 12 p.m. Monday.
An additional Wind Chill Advisory for DuPage, Cook, LaSalle, Kendall, Grundy, Will, Kankakee, Livingston, Iroquois, and Ford Counties, as well as Lake, Porter, Newton, Jasper, and Benton Counties in northwest Indiana was issued Sunday morning.
That advisory will take effect at 9 p.m. Sunday night through 12 p.m. Monday.
By 4 p.m. Sunday, wind chill values area wide will be well below zero, with temperatures feeling like -13 in DuPage and Aurora, -11 in Romeoville and Morris. -9 at Midway and -10 at O'Hare, with DeKalb at -15.
Overnight hours will see even more of a chill, with temperatures at 7 a.m. Monday feeling like -18 in DeKalb, -16 in DuPage and Aurora, -13 at O'Hare and Midway, -14 in Romeoville.
Partly cloudy skies and wind may remain through the week until Wednesday when we see temperatures pick up slightly and a chance of snow.
The NWS warns that temperatures this cold can cause frostbite in as little as 30 minutes, and if you must go outdoors, take proper precautions, wearing layers as well as a hat and gloves.