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.

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.

A chilling polar vortex is set to bring snow and ice to the South and East this week. We show where.

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. Here's the forecast.

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

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

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

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.