"There's not that many times in history it's been this cool for this long," a National Weather Service meteorologist said Tuesday.

As parts of Canada finally get a bit of a reprieve, one part of the country will be dealing with extreme cold with wind ...

After years of work building an exquisitely sensitive instrument, University of Chicago scientists stood and watched as it flew up and out of sight into the fiercely blue Antarctic sky. Launched on ...

A vast winter storm is gripping the United States, bringing dangerous snow, ice and plunging temperatures to millions.

A warming Arctic can stretch the polar vortex, a high-altitude air ribbon, one says. The “wobble” can disrupt the jet stream, ...

This winter’s harsh run is intensifying, with some of the coldest air so far this season plunging into New Hampshire.

Snow and blowing snow will continue across Michigan as an Arctic cold front moves through the state. In the Upper Peninsula, ...

This winter’s harsh run in the East is intensifying, with some of the coldest air so far this season plunging into Vermont this weekend.

New York is bracing for the coldest air of the winter this weekend, with snow. Learn how the polar vortex is involved.

The polar vortex is a huge area of cold air high up in the atmosphere that usually spins over the North Pole. Its position ...

While the first part of this week brought a brief reprieve from the brutally cold weather the U.S. has been experiencing since January, frigid temperatures are ...

The bitter cold temperatures that have left a chill over the eastern half of the country aren’t going anywhere, as a major disruption to the Polar Vortex is coming this month.