National Weather Service officials are expecting temperatures in the high 20s with windchills below zero. Current conditions at O’Hare International Airport is a few clouds at 22 degrees with a windchill of negative 6 degrees. At Midway Airport conditions are partly cloudy at 24 degrees with a windchill of negative 4 degrees, officials reported. Officials expected temperatures in the high 20s with a northwest wind between 5 to 10 mph. Saturday night, officials expect temperatures in the high teens with a calm wind. Sunday, highs are expected in the low 30s with winds between 10 to 15 mph and gusts up to 25 mph.     .