This story has been edited to correct an error. Judah Cohen is affiliated with the Massachusetts Institute of Technology. Our old wintertime friend the polar vortex ...

Record cold temperatures are once again expected to hit a swath of the country this weekend—even plunging Florida into its coldest stretch of the last 15 years, potentially bringing snow to areas of ...

Add Yahoo as a preferred source to see more of our stories on Google. Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season, followed ...

A major winter storm is impacting much of the nation east of the Rocky Mountains. The storm's intensity is caused by a combination of a stretched polar vortex, a wavy jet stream, and moisture from the ...

Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season, followed by some of the coldest temperatures seen in years. The storm began out ...

Michigan is experiencing frigid temperatures and heavy snow due to a dip in the jet stream, not the polar vortex. The polar vortex is a large-scale cyclone of cold air that typically stays far north ...

A forecast map reveals which states can expect to see "persistent cold" in the weeks ahead, after experts said the polar vortex would unleash waves of icy air across parts of the U.S. through January.

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