Much below normal temperatures should persist across the eastern U.S. into early February before moderating slightly.

Rising Arctic temperatures and melting sea ice could be causing cold air to flow into the Northern Hemisphere. But not all ...

Each of these lobes of the Polar Vortex will bring two or three days of bitterly cold, below-normal temperatures. We aren’t just talking Michigan’s normal cold. It could be 20 degrees colder than ...

As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what 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, ...

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, ...

The 35th annual Lewes Polar Bear Plunge has been postponed due to a forecast of extreme cold, strong winds, snow, and ...

As a winter storm approaches Western North Carolina and other regions, here's what to know about deciphering forecaster terms ...

Microbes across Earth's coldest regions are becoming more active as glaciers, permafrost and sea ice thaw, accelerating ...