The most unusually cold air in the Northern Hemisphere will be over the United States early next week, bringing dangerously ...

The storm will track toward the East Coast early Saturday, with light to moderate snow for many states, including Washington ... continue to flow across the United States over the next week.

A Siberian chill is on the horizon, threatening to plunge the U.S. into a deep freeze in parts of the east coast ...

Flight cancellations and delays are stacking up as a major winter storm makes its way across the East ... out of the United States on Monday. Those flight cancellations hit the Washington, D.C ...

The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes plunges southward into the U.S., Europe and Asia. Studies show that a fast-warming Arctic is partly to blame ...

As a massive winter storm is rolling through regions of the United States on Monday, see pictures of snow from across the Midwest and East Coast.

Japan and the Philippines plan to convey to President-elect Donald Trump the urgent need for the U.S. to remain committed to ...

Winter’s most potent Arctic blast yet is about to unleash dangerously low temperatures that will be the coldest to hit the ...

"Over a dozen states are forecast to ... average from the Great Plains to the East Coast, according to the weather service. In Arlington and the Washington, D.C., region, where some winters ...