National Weather Service officials were expecting below zero wind chills in the area Friday morning and snow flurries into the night.
Officials said there is a slight chance of snow after midnight when flurries are expected.
Midmorning conditions at O’Hare International Airport were fair at 3 degrees with a wind chill of minus 16. Farther south at Midway Airport it was 5 degrees, officials said.
In portions of north-central and northeast Illinois and northwest Indiana, officials expected the frigid wind chills to continue throughout Friday morning, warning it could feel between 10 to 20 below zero.
Around midnight Friday, flurries are expected to move into the area when there is a slight chance of snow. On Saturday, flurries and temperatures in the mid-30s are forecast.