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

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

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.

Add Yahoo as a preferred source to see more of our stories on Google. Much of the country will be hit with extreme low temperatures over the next week as a polar vortex sends cold air down from the ...

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

Year-round, severe, Artic air is usually kept tightly contained in the North Pole. Arctic wind patterns create a sort of wall ...

A shift in the polar vortex has forecasters watching closely as the coldest air of the season approaches. Here's what to know ...

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

Much of the country will be hit with extreme low temperatures over the next week as a polar vortex sends cold air down from the North Pole. Real feel temperatures throughout the northeast, including ...