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

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.

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

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

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest ...

The meteorologists said the polar vortex system is set up due north of Michigan over Canada's Hudson Bay. It's at least ...

Starting Thursday, dangerously frigid air from Siberia and the North Pole is forecast to plunge the Great Lakes region into ...

The big winter (and popular) topic is dusted off very early this season as frigid air plunges south next weekend. But what is ...

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

Alabama braces for another polar vortex blast bringing well below freezing temperatures. How cold will temperatures get? Here ...

A sudden stratospheric warming event reversed the winds that make up the northern polar vortex on March 9. A new animation shows the vortex also moved away from the Arctic towards Europe. When you ...