The polar vortex's icy grip on much of America has Arctic Greenland seeming like a toasty vacation spot by comparison.

"An Arctic air mass is expected to plunge into the Central U.S. this week, with high confidence for widespread, ...

Another arctic blast has sent temperatures plummeting across the United States, bringing “life-threatening” wind chills and ...

The polar vortex is not synonymous with cold snaps, but when it slides toward the United States, the polar jet stream can ...

Meteorologists warn that the coldest burst of Arctic air this season is coming to put an icy and prolonged exclamation point ...

How Alaska’s cold keeps ending up in the Lower 48 A few atmospheric factors — including the polar vortex — have come together to make the US the epicenter of cold this winter. One is a ...

The polar vortex has returned to the U.S., and frostbite-inducing temperatures are blasting millions of Americans.

The polar vortex, as explained by the National Weather Service, is a large area of low pressure and cold air that encircles ...

Harsh weather moved west as a polar vortex was expected to grip the Rockies and the northern Plains after winter storms pummeled the eastern U.S. over the weekend, killing at least 10 people, ...

But at times some of the vortex can break off or move south, bringing unusually cold weather south and permitting warmer weather to creep up north.Related video above: Potentially record-setting ...

But at times some of the vortex can break off or move south, bringing unusually cold weather south and permitting warmer weather to creep up north.Related video above: Potentially record-setting cold ...