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

An arctic blast will send temperatures across the United States plummeting as bitterly cold air that originated in Siberia ...

Here's the latest on the winter storm. A historic winter storm is poised to produce potentially record-breaking snows from ...

Extreme cold and snow smacked the Gulf Coast states this week, but the polar vortex may not be to blame.

Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around ...

An Arctic blast that began in the northern plains on Saturday spread bitter cold from the Rockies through the East Coast and ...

A blast of arctic air from Canada has brought the season's coldest weather to most of the United States. The system, known as ...

Most of the U.S. will enjoy milder temperatures on Thursday, but the warmup will be brief as a polar vortex will send ...

These severe cold events occur when the polar jet stream – the familiar jet stream of winter that runs along the boundary ...

A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into ...

Anytime we get an Arctic air blast down this far south, this is an artifact of the polar vortex rearing its ugly head,” said ...

A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans.