The polar vortex is a broad, fast ribbon of cold air that encapsulates the Arctic high in the stratosphere. Stable, it confines cold air near the North Pole. Unstable, it is rocked and stretched out ...

Anna Skinner is a Newsweek senior reporter based in Indianapolis. Her focus is reporting on the climate, environment and weather but she also reports on other topics for the National News Team. She ...

ROCHESTER, N.Y. (WROC) — The buzzword made famous from an arctic blast in 2015 is making a comeback. The polar vortex, a rotating bubble of cold air around the North Pole, is about to break off and ...

A second bout of severe winter weather pummeled the central United States on Friday with freezing temperatures and icy conditions. It arrived just days after a massive winter storm, traveling from ...

It’s really, really cold again — as the US shivers through at least the eighth blast of air from the Arctic this winter. Winter, which is warming faster than any other season for much of the US, seems ...

There are "enhanced odds" for colder-than-normal temperatures in December, January and February, according to NOAA. The official outlook says areas with enhanced odds include the upper Mississippi ...

Editor's note: CNN’s Laura Paddison contributed to this report. (CNN) — It’s really, really cold again — as the US shivers through at least the eighth blast of air from the Arctic this winter. Winter, ...