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

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

The polar vortex is forecast to weaken unusually early, and that could lead to more persistent cold weather in at least parts of the U.S. in December. Last week, almost 100 daily record lows were tied ...

Tens of millions of people are in the path of a major winter storm. Federal cuts threaten efforts to understand the causes of such weather.

In yet another sign that winter weather is either here or will be soon, the dreaded polar vortex is making news yet again. Its potential arrival in the United States over the next few weeks is cause ...

The North Pole is surrounded by a massive circular upper-air weather phenomenon in the Arctic called the polar vortex. It is ...

When the polar vortex breaks, Artic air come south. Here's what to know right now.

If news about a polar vortex striking your region makes you reach for your blanket with nervous hands, keep in mind that your house feels just the same. Although the term "polar vortex" may not quite ...

A Polar Vortex brought temperatures so cold in January 2014 that it froze Niagara Falls. Signals of a rare sudden stratospheric warming in the next two weeks have some forecasting an imminent Arctic ...