An "Arctic anticyclone" slumping over the United States will spawn a frenzy of snow-laden winter storms. More than 200 ...

A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of the arctic blast.

A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the South.

The coldest air of the season will descend across the U.S. this weekend and early next week, bringing subzero wind chills with it.

"Multiple waves of arctic air continue to gather over northern Canada with eyes for the central and eastern United States in the days ... the National Weather Service warned, before roaring ...