The polar vortex is a large upper-level, low-pressure area or circulation that typically resides above the Arctic Circle.

The first of three rounds of bitter air has arrived, threatening record lows in cities from the Midwest to the Northeast.

According to Cincinnati.com, the polar vortex broke, which, again, is a common phenomenon. "The North Pole is covered by the polar vortex, a massive circular upper-air weather system in the Arctic," ...

The Upper Midwest and Northern Plains have been hit by Canada's freezing temperatures. On Thursday, Dec. 4, wind chills ...

A polar vortex broke, and severe temperatures are set to dominate most of the United States, including the Midwest, in the ...

Thanks to the polar vortex, the first half of December will bring multiple waves of Arctic air to the U.S. Here's what to ...

As one blast of Arctic air pushes out to sea, already a new surge of cold air, driven by a breakdown of the polar vortex, is ...

Most of Virginia is expected to receive 1-4 inches of snow on Monday, just three days after a similar snowfall covered all ...

Polar vortex disturbance is causing frigid Artic air to surge southward, bringing cold temperatures and possibly snow to many ...

Arctic wind patterns create a sort of wall around the pole that prevents frigid air from trickling southward. That wall that ...

A dangerously cold Arctic blast is poised to blanket the tri-state area.  Get your warmest coats, hats, mittens and scarves ...

Frigid Arctic air is pushing south into the United States, and fortunately, it doesn’t look like freezing temperatures will ...