A powerful nor’easter is expected to hit the East Coast this weekend, while El Niño and the polar vortex may shape months ...

Forecasters say that the polar vortex will usher in waves of frigid air across parts of the U.S. through January. The “more active polar vortex will drive colder air and snow across the central and ...

A forecast map reveals which states can expect to see “persistent cold” in the weeks ahead, after experts said the polar vortex would unleash waves of icy air across parts of the U.S. through January.

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

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

The stratospheric polar vortex, the winter engine that traps Arctic cold high above the North Pole, is entering its seasonal collapse. What's left is the lower-level polar vortex core, lingering over ...

A mass of Arctic air from Canada is bringing brutally cold temperatures to the northeastern United States. New Hampshire is under an Extreme Cold Watch, with wind chills expected to reach 20 to 30 ...

A polar vortex split is expected to bring frigid Arctic air and single-digit temperatures to Ohio and the Great Lakes region later this month. The event is a full split of the vortex, which could lock ...