Blizzard warnings were 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.

Chicago-area residents woke up to falling snow Friday morning, complicating the morning commute and halting all flights to O’Hare International Airport. The Federal Aviation Administration issued a ground stop at O’Hare until 9:15 a.

More than 400 flights were delayed or canceled at Denver International Airport on Monday as a polar vortex continued to freeze metro Denver.

The season's latest winter storm could wreak havoc on air travel in the Northeast this weekend. Meanwhile, parts of Texas and the Gulf Coast are eyeing another potential winter storm.

More than 200million Americans are facing a life-threatening deep freeze this week as an arctic blast brings sub-zero temperatures and a thick blanket of snow to much of the US.

An arctic air mass blanketed New York City on Sunday night, dumping several inches of snow and ushering in a deep freeze that grounded flights at airports across the city and New Jersey. “We urge New Yorkers to take this storm seriously and prepare for hazardous travel conditions,

A winter storm expected to bring heavy snow to Philadelphia on Sunday is already impacting air travel. In Philadelphia and along the Interstate 95 corridor, expect 3-6 inches of snow to fall by the time the snowstorm wraps up Sunday night.

Most of the United States is being assailed with extreme winter weather this week as Arctic air blasts south from Canada, snow tracks up the Northeast coast and a potentially crippling winter storm takes aim at the South.

At least 204 flights were delayed Saturday morning at Denver International Airport, as snow and bitter cold brought by a polar vortex gripped the metro area. Nearly half of the flights — 101, as of 11:45 a.

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"The level and extensiveness of the frigid air may be tough to match the rest of the winter," forecasters warned.