THIS AFTERNOON: Mostly cloudy and colder, with temperatures in the 20s and wind chills in the teens. Temperatures drop to single digits, with wind chills nearing or slightly below zero. EXTENDED: Temperatures keep falling on Friday, with highs in the teens and feels-like temperatures in the single digits. An ABC 17 Stormtrack Weather Alert Day will go into effect Saturday morning as wind chills plunge well below zero, ranging from -10 to -15 degrees. Wind chills will stay in the low single digits on Saturday and fall into the negative single digits Saturday night.