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

It's like "bomb cyclone" or "firenado." It seems like the sort of phenomenon that would be responsible for the ...

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

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 ...

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 ...

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 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 ...