Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.

Now, it's got its own catchphrase: the polar vortex, which could be making a return engagement to the U.S. later this month or in January. Or maybe it won't. Regardless, the polar vortex – everyone's ...

CHICAGO — A year after a brutally cold spell was blamed on something called the polar vortex — which was treated like a northern invasion by the media and as a conquering hero by children impressed by ...

LOUISVILLE, Ky. — Harsh cold descended on the nation's midsection Monday as a polar vortex gripped the Rockies and Northern Plains on the heels of weekend storms that pummeled the Eastern U.S. with ...