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.

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Around 40 million people, primarily across the southern US, were under some type of weather hazard, March Chenard, a meteorologist with the NWS, told BBC's partner CBS News. Another 170 million people from the Rockies to points eastward were under an extreme weather warning or cold weather advisory.

Blizzard warnings have been issued for areas near the Gulf Coast as a massive winter storm hits the South. Nearly 250 million Americans are under cold weather advisories or extreme cold warnings.

Chief Meteorologist Chris Justus is tracking falling temperatures and possible winter weather as rain moves out and arctic air moves in.

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The storm prompted the first-ever blizzard warnings for several coastal counties near the Texas-Louisiana border, and snowplows were at the ready in the Florida Panhandle.

Rain will return to the state Saturday. Next week, temperatures will drop significantly. We are also tracking the chance for some precipitation by mid-week.

A rare winter storm charging through Texas and the northern Gulf Coast on Tuesday has closed highways and airports and prompted the first blizzard warning for southeast Texas and southwest Louisiana.

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