Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States.

As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...

The big winter (and popular) topic is dusted off very early this season as frigid air plunges south next weekend. But what is ...

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The cosmos has served up a gift for a group of scientists who have been searching for one of the most elusive phenomena in the night sky. Their study, presented in Science Advances, reports on the ...

A disruptive polar vortex is set to usher in three successive waves of Arctic air across the central and eastern United States through mid-December, bringing dangerously low temperatures and the ...

Add Yahoo as a preferred source to see more of our stories on Google. A map of the polar vortex that is bringing frigid temperatures to parts of the U.S. (AccuWeather) The first of three rounds of ...

This uncomfortable Arctic blast of air is set to stick with us for the next several days, creating dangerously cold temperatures. Subzero wind chills are going to make it feel even colder in some ...

Just a few days into December, an arctic air mass has swept into the United States, bringing subzero morning lows and daytime highs stuck in the teens for 30 million Americans in the Northern Plains, ...

A polar vortex will bring arctic air and subzero temperatures to parts of the U.S. through the middle of the month, according to AccuWeather. This first of three likely rounds will impact the U.S.

If you’ve ever wondered why winter sometimes flips from mild to brutally cold, the answer might be hiding 20 miles above your head. That’s where a rare atmospheric phenomenon called sudden ...