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

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

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

A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the ...

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

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

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.

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

In normal conditions, the polar vortex spins tightly over the Arctic, allowing the polar jet stream—which blows by beneath and south of the polar vortex—to remain fairly smooth. “If the ...

Snow and winds are likely to disrupt traffic, trigger flight cancellations, and cause headaches for people traveling to D.C.