The Polar Vortex is expected to be impacted by a Sudden Stratosphere Warming, bringing cold air to the eastern US.

A winter buzzword, explained.

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

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.

Rising Arctic temperatures and melting sea ice could be causing cold air to flow into the Northern Hemisphere. But not all ...

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.

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

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

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

High above the North Pole, in a slice of atmosphere rarely noticed and even less understood, a transformation is underway. Over the next 10 days, changes in the stratosphere will upend weather ...