Much below normal temperatures should persist across the eastern U.S. into early February before moderating slightly.

To understand what Americans are experiencing with this winter blast, we need to look more than 20 miles above the surface of ...

A collapse in the polar vortex is letting Artic air come here. What that means, and why it happens.

Deep penetration of cold temperatures and a coastal storm will bring bomb cyclone and polar vortex into your newsfeeds.

A severe winter storm that brought freezing rain, sleet and snow to a large part of the U.S. was intensified by the polar ...

Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.

Brutal midwinter cold is settling in across the eastern United States, and forecasters say it is not leaving quickly. A disrupted polar vortex is expected to keep Arctic air locked over the region ...

Meteorologist Sven Sundgaard predicted this wacky winter weather back in October, and he explains what's happening now and ...

The west half of the country, including the Midwest, will start to warm up. But that won't be the case for the East Coast.

In the wake of the historic winter storm that blasted 40 states this weekend, a dome of Arctic air associated with the polar ...

The greater Philadelphia region will experience no weekend letup in the prolonged cold snap gripping the area.