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BISMARCK, N.D. — 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 ...

Above: A Von Karman vortex street downwind of the Canary Island chain in the eastern Atlantic Ocean off the coast of Africa on Feb. 27, 2015. Image credit: NASA Worldview. Editor's note ...

LOUISVILLE, Ky. (AP) — 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 ...

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 at least 10 ...

I'm Mimi Kiley reporting. 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 ...

The harsh weather conditions that have hit the US and may continue to do so for the week are linked to a weather phenomenon called the polar vortex. AP Meteorologists had predicted that parts of the ...

Bitter cold temperatures are expected to continue throughout the week in Chicago, with wind chills plunging to minus 20, the National Weather Service said. A cold weather advisory is in effect ...