A weakened polar vortex can send Arctic air thousands of miles south, triggering extreme cold far beyond the polar regions. A ...

THE polar vortex has taken shape over the North Pole and is starting to get stronger, but what exactly does that mean for the ...

Just a few days into December, an arctic air mass has swept into the United States, bringing subzero morning lows and daytime highs stuck in the teens for 30 million Americans in the Northern Plains, ...

The polar vortex is taking shape over the North Pole, and it is starting the season stronger than normal. That might sound ...

A stronger polar vortex is developing over the Arctic. Here's what it could mean for winter, including the role of a powerful El Niño.

A polar vortex will bring arctic air and subzero temperatures to parts of the U.S. through the middle of the month, according to AccuWeather. This first of three likely rounds will impact the U.S.

If you’ve ever wondered why winter sometimes flips from mild to brutally cold, the answer might be hiding 20 miles above your head. That’s where a rare atmospheric phenomenon called sudden ...

The FOX Forecast Center reveals arctic air is descending and spreading across the Lower 48 states. FOX Forecast Center / FOX Weather The polar vortex has returned to the U.S., and frostbite-inducing ...

Another brutally cold weekend is on the way as a piece of the Polar vortex dips out of the Arctic Circle, sending frigid air across half of the United States while the other half warms up. Texas will ...

A strong polar vortex and 'super' El Niño are developing, leaving experts split on how they could Tennessee winter.

A winter storm descending on the US is expected to deliver heavy snow and ice to more than 150 million people across roughly two dozen states. Forecasts predict the storm will plunge Texas into a deep ...

A stronger polar vortex is developing over the Arctic. Here's what it could mean for winter, including the role of a powerful ...