The term “polar vortex” usually refers to the gigantic circular upper air weather pattern in the Arctic region. It is a normal pattern that is stronger in the winter and keeps some of the coldest ...

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 ...

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 ...

BISMARCK, N.D. — Harsh weather moved west on Monday as a polar vortex was expected to grip the Rockies and the northern Plains after winter storms pummeled the eastern U.S. over the weekend, killing ...