A potent surge of Arctic air starts settling in Monday evening 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 through Thursday with the highs only reaching the teens and some lows even plunging below zero.

Even the Mississippi Coast will take a hit. Biloxi is expected to experience several nights with lows at or below freezing. That may not sound very impressive compared to Oxford's predicted 13 degrees, but down on the Coast, that's chilly, y'all.

FIRST ALERT WEATHER DAYS in effect for tonight through Wednesday evening as dangerously cold Arctic air moves into the region. The low that brought us snow last night and this morning has moved off to our northeast.