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 ...

However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is bringing an even harsher arctic blast to million Americans this week. Maps show what to expect as the cold front ...

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

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 temperatures tumbling below freezing for most of the nation starting this weekend.

The polar vortex can be a powerful source of winter weather, but it's not the only cause of severe cold and snow in regions better known for warmth and sunshine. The Gulf Coast states are still ...

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 ...

An Arctic blast that began in the northern plains ... The cold blast was the result of a lobe of the dreaded polar vortex dropping southward into the United States. It is a largely misunderstood ...