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.

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

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

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

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

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 ...

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

It exists all the time, but it usually gets stronger in winter. When the jet stream (a river of wind) bends and dips south, ...

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 ...

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