The polar vortex is making a return to the forecast, but the counterintuitive weather feature is nothing to fear.

Bitingly cold Arctic air keeps pummeling the U.S. with ruthless cold snaps—despite warming winters nationwide. A study explains why: the solution lies far above your head, in the upper atmosphere ...

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 ...

The polar vortex is beginning its seasonal strengthening, signaling a gradual shift toward cooler weather. Frost advisories were issued in parts of the Great Lakes region, New York, and New England as ...

(AP) - The coldest burst of Arctic air this season is coming to put an icy exclamation point on America’s winter of repeated polar vortex invasions, meteorologists warn. And it will stay frozen there ...

The polar vortex can't be felt in the United States or anywhere on Earth. Brutally cold temperatures are heading to the Midwest and Northeast this week -- but don't mistake this for a polar vortex ...

A few bitterly cold days are coming next week, but there is light at the end of a very cold tunnel. Arctic air will blast into Michigan Sunday night, and settle in for Monday, Tuesday and Wednesday.

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Fans in Green Bay suffered through frigid temperatures, thanks to Arctic air that has come southPhoto by Ronald Martinez/Getty Images It’s polar bear weather today for much of the Midwest.

"The atmosphere inside the polar vortex, from near the surface to about 30 kilometers high, is characterized by extreme cold temperatures ... atmosphere freezes out and is deposited onto the ice cap, ...

The polar vortex is stirring up, bringing the earliest hints that the seasons are changing. That shift is most noticeable in northern Wisconsin, where a frost advisory was in effect early Monday, Sept ...