A potent shot of Arctic air starts settling in Monday as a massive dip in the jet stream pulls in frigid air across the entire eastern half of the country. Temperatures are set to drop as low as 20 degrees below average Tuesday and Wednesday with highs only reaching the teens, with lows in the single digits and even plunging below zero.

An arctic blast will send wind chills plummeting below zero through Monday, Tuesday, and Wednesday. Unusually cold air temperatures will reach down to the Gulf Coast. Locally, expect daily high temperatures in the teens and single digits, with overnight lows falling below zero.