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

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

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.

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

Alabama braces for another polar vortex blast bringing well below freezing temperatures. How cold will temperatures get? Here's what to know.

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 ...

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

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 ...

The incoming Arctic blast will bring very cold temperatures to West Michigan, but it still falls short of the historic, extreme cold experienced during the 2019 Polar Vortex.

Water, salt, and heat all get mixed within eddies with important climate consequences, but the boundary of an eddy is hard to ...