A powerful arctic air mass is sweeping across the Southeast, plunging temperatures 20 to 30 degrees below normal and shattering records across Florida and neighboring states. Residents from Miami to Tallahassee are feeling an unusually sharp chill for November. Freeze warnings stretch across the region, with many areas facing their coldest night of the season. The abrupt change follows a strong polar front, making heaters and winter coats essential even for typically mild coastal communities.