McHenry County residents woke up to subzero temperatures Friday morning and 10 to 15 MPH winds, which will resulted in wind chill values from 20 to 30 degrees below zero, according to the National Weather Service.
If you have to be outside, make sure to layer your clothing to prevent frost bite and hypothermia.
There is a 90 percent chance of snow Saturday and into Saturday night, with accumulation of 1-3 inches, according to the weather service. Snowfall is likely to begin after 1 p.m.
Wind chills could approach 20 below again Sunday night and Monday morning, and then again Monday night and into Tuesday, the weather service said.