When the polar vortex stretches, North America feels the chill. New research reveals some of the stratospheric patterns controlling these cold snaps.

Even in a warming climate, brutal cold snaps still hammer parts of the U.S., and a new study uncovers why. High above the Arctic, two distinct polar vortex patterns — both distorted and ...

Despite a warming climate, bone-chilling winter cold can grip parts of the U.S. In a study appearing in Science Advances, researchers found that two specific patterns in the polar vortex, a ...

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

Full production of a new polar security cutter for the U.S. Coast Guard was recently approved by the Department of Homeland Security, as the administration seeks to boost shipbuilding and maritime ...

A video captured a polar bear charging at a person in Norway's Svalbard archipelago, forcing them to drop their gun and race away on a snowmobile.

Public perception to the contrary, outbreaks of the polar vortex in the northern hemisphere—the bitter cold triggered by the wandering jet stream—are becoming less common.

Why has April in Chicago been cold so far? A big factor is the disruptions in the polar vortex, even as the “polar vortex season” is winding down, according to NBC 5 Meteorologist Kevin Jeanes.

Several days with temperatures of 10-20 degrees below the historical average could be dangerous to plants and ruin outdoor plans.

A sudden stratospheric warming event reversed the winds that make up the northern polar vortex on March 9. A new animation shows the vortex also moved away from the Arctic towards Europe.

More: Powerful polar vortex in the stratosphere brings frigid temperatures to US Polar vortex to blame? Experts say the polar vortex will play a role in next week's cold snap. The polar vortex is a ...