Millions of Americans face an artic blast, including the first-ever blizzard warning for parts of the Gulf Coast.

A winter storm prompted a National Weather Service office in Louisiana to issue a first-ever blizzard warning. The storm is causing dangerous conditions from Texas to North Carolina.

A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of the arctic blast.

A rare winter storm churned across the U.S. Gulf Coast on Tuesday, bringing heavy snow, ice and wind gusts to a region where flurries are unusual, while much of the United States remained in a deep freeze.

A rare winter storm churned across the U.S. Gulf Coast on Tuesday, bringing heavy snow, ice and wind gusts to a region where flurries are unusual, while much of the United States remained in a deep freeze.

Rare winter storms have sparked extreme cold weather warnings - some of the first in history - for parts of the US Deep South.

Houston’s two major airports, George Bush Intercontinental and Hobby, are also closed Tuesday, while Hartsfield-Jackson Atlanta International Airport, the world’s busiest, is pretreated roadways and airfield surfaces in preparation for the winter weather, according to spokesperson Andrew Gobeil.

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A slug of polar vortex-fueled arctic air will spill into the U.S. this weekend, bringing sub-freezing temperatures deep into the South. With that comes a wild swing in temperatures. For example, the highs on Saturday in Houston are forecast to be in the 60s.

Flight cancellations are mounting as a historic winter storm sweeps across the Gulf Coast. Already, the storm has brought air traffic to a virtual standstill at several airports across parts of Texas and Louisiana.