A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into ...

The plunging polar vortex is bringing subfreezing temperatures to some of the southernmost points of the U.S. A forming storm ...

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 ...

A workman clears steps at the Capitol as snow falls ahead of a joint session of Congress to certify the votes from the Electoral College in ... on Monday as the polar vortex that dipped south ...

A snowplow clears the area as snow blankets Capitol Hill ahead of a joint session of Congress to certify the votes from the Electoral College in ... on Monday as the polar vortex that dipped ...

BOSTON (AP) — Residents across the country from the Northern Plains to the tip of Maine are bracing for dangerously low ...

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“Winter returned,” said Bob Oravec, lead forecaster at the National Weather Service in College Park, Maryland. The polar vortex of ultra-cold air usually stays penned up around the North ...

There is a chance in some places of at least 8 inches of snow, freezing rain and a hard freeze as far south as Florida ...