An arctic air mass sprawling across the eastern, central and parts of the western U.S. on Monday will channel temperatures 20-30 degrees below already historically cold January averages and was poised to slam parts of the South with a disruptive winter storm.

First Alert Weather Days continue Tuesday and Wednesday with bitterly cold, sub-zero wind chills expected through at least early Wednesday afternoon before improvement arrives later this week. Snow chances aren’t zero through the next few days, but the cold weather is the primary reason for the First Alert Weather days.