A colder push of arctic air will arrive later today and tonight. This will result in overnight low temperatures of 10-to-20 below zero. These temperatures combined with west to northwest winds of 5 to 15 mph will result in dangerously cold wind chills of 25 below and lower. Frostbite and hypothermia can occur in as little as 10 minutes without precautions. Find updated cancellations and delays here.