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

The long-range data shows we may be done with a true Arctic air mass similar to what we experienced in January. But we ...

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.

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

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

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

Most of the U.S. will enjoy milder temperatures on Thursday, but the warmup will be brief as a polar vortex will send temperatures tumbling below freezing for most of the nation starting this weekend.

A blast of arctic air from Canada has brought the season's coldest weather to most of the United States. The system, known as a polar vortex, is forecast to bring subzero temperatures to the ...