Three factors are combining to increase the likelihood of a weaker polar vortex this winter, the website reports. And a ...

Two newly identified patterns in the stratospheric polar vortex can send cold air over North America to cause extreme cold ...

Stratospheric polar vortex changes still trigger brutal U.S. winter cold snaps and extreme weather despite a warming climate.

Despite a warming climate, bone-chilling winter cold can grip parts of the U.S. In a study appearing in Science Advances, ...

Even in a warming climate, brutal cold snaps still hammer parts of the U.S., and a new study uncovers why. High above the ...

The polar vortex has taken on an unexpected pattern this winter — one that’s made part of the United States the most unusually cold place on the planet, at least so far this year.

Computer forecast models say that the polar vortex is likely to stretch again, sending cold air south somewhere and probably to the United States, around March 5, Cohen said.

A somewhat alarming new phrase entered the American lexicon when parts of the United States were plunged into an especially bitter deep freeze in January 2014: “polar vortex. ...