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 ...

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 ...

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 ...

A "polar vortex" is bringing intense cold and heavy snow to large swaths of the US and Canada. How is this winter weather related to climate change? Large parts of the United States and Canada are ...