A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

A chilling polar vortex is set to bring snow and ice to the South and East this week. We show where.

Don't let the incoming string of relatively warm days in the greater Philadelphia region fool you; the polar vortex is still around.

What is the polar vortex? This article explains what a polar vortex is in simple terms, how it influences winter weather in the U.S., and why meteorologists talk about it during major cold events.

After this weekend's snow storm moves out, cold Arctic air will move in.

The polar vortex has broken, and severe temperatures are set to dominate most of the country in the coming days. Temperatures in the 10s are forecast for much of the Northeast, and subzero ...

The term "polar vortex" seems to be popping up in weather forecasts more and more often, ever since North America got blindsided by a stunningly frigid winter back in 2014. The polar vortex isn't a ...

An arctic air mass has descended into the US, and a disrupted polar vortex will keep the nation in the freezer at times deeper into December. More than 200 million people will wake up to freezing ...

Three separate rounds of Arctic air have already swept across the central and eastern United States through mid-December, courtesy of a displaced polar vortex positioned near Hudson Bay, Canada. If ...

The issue arises when this vortex becomes destabilized. During sudden stratospheric warming events—sharp increases in ...

Meteorologists are predicting cold air to sweep across much of the United States in the week following Thanksgiving. That'll mean below-normal temperatures for a lot of areas. But lucky for ...