National Weather Service United States Department of Commerce

An Extreme Cold Warning is in effect until noon for the entire area. Dangerous cold will continue through noon! Wind chills of -25 to -35 degrees are expected! Stay inside, if you can. If you have to go outside, bundle up covering all exposed skin and limit your time outside!
Dangerous cold is expected this morning! Wind chills of -15 to around -30 are likely across much of the area! If you have to go outside, be sure to bundle up and cover all exposed skin!
There is a chance (40-60%) for light snow late tonight through Wednesday night. Snowfall amounts will be under an inch in most areas, with amounts up to 1.5 inches in portions of northwest Illinois. Untreated roads may become snow-covered and slick. If you encounter snowy conditions, slow down and be more careful turning, approaching stops, and when driving on entrance and exit ramps.
Extreme cold is expected! Stay inside, if you can. If you absolutely have to go outside, bundle up! Cover all exposed skin! Limit your time outside!