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

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

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

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

A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by ...

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

A series of disturbances in the atmosphere is sending the polar vortex south (again) next week with a burst of even colder ...

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 ...

Abundant cloud cover and rain will keep overnight temperatures more mild, with lows in the 50s and 60s throughout Central ...

A brutal polar vortex is set to bury the Big Apple in snow Sunday and then deliver deadly single-digit temperatures that will ...

We've already fallen as low as 1° this year. Another dip in the polar vortex makes that possible for Cincinnati again next week.