The coldest winds of the season will hit the Chicago area overnight, with some locations dropping as low as 25 degrees below zero on Friday morning.
A wind chill advisory is now in effect for several counties in northern Illinois, including McHenry, DeKalb, Kane, LaSalle, Kendall, Will, and Kankakee counties. That advisory will run until 9 a.m. Friday, according to the National Weather Service.
The advisory was issued when the air temperature drops to a low in the single digits, and the winds will make things feel even colder.
In fact, chills from the wind in the far western suburbs could dip to minus 25 degrees overnight, and will be only slightly warmer than during the morning commute. The far southern suburbs are likely to experience similar temperatures, and in the city of Chicago, wind chills could still reach minus 10 degrees.
Those kinds of chills can cause frostbite on exposed skin in as little as 30 minutes, according to the National Weather Service, and residents are urged to bundle up and spend as little time outdoors as possible.
Winds will be calmer on Friday, but that will do little to ease the chill as highs are only expected to reach their mid-teens over most of the area.
However, there is some temperature relief on the horizon, with highs bouncing around 30 degrees on Saturday and Sunday. That will come at a price, however, as mixed rainfall and rain are expected to arrive on Saturday night.
Once the weather system kicks in, the Chicago area will have one more day of well below average temperatures to deal with as highs will be back in their teens on Monday, but then temperatures will start to warm up. slowly, probably reaching back to 30 by Wednesday.