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.

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.

The bitter cold temperatures that have left a chill over the eastern half of the country aren't going anywhere, as a major ...

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

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

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

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

What is the polar vortex? This article explains what a polar vortex is in simple terms, how it influences winter weather in ...

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

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