Ford and Iroquois counties have been added to the wind chill advisory for eat-central Illinois Wednesday morning. It's in effect from midnight to 11 am.
The National Weather Service had issued a wind chill advisory for DeWitt, Piatt, Champaign and Vermilion counties earlier.
Wind chills could get as low as 20 degrees below zero, leading to an increased risk of frost bite and hypothermia. If you have to be outside, wear plenty of warm clothing.