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.

Light snow flurries in Indianapolis early Sunday signaled an approaching arctic air mass that could bring dangerous wind chills as low as -20 degrees across Indiana in the coming days. Bitterly cold temperatures are forecast across Indiana from 7 p.

An arctic blast that is expected to bring wind chills to double digits below zero has led forecasters to issue a cold weather advisory this week.