During winter in the Northern Hemisphere, the polar vortex can often expand and send cold air south, often referred to as an ...

This winter’s harsh run in the East is intensifying, with some of the coldest air so far this season plunging into Vermont this weekend.

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Researchers at the University of Maine and the U.S. Department of Energy's (DOE) Oak Ridge National Laboratory (ORNL) are ...

Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.

• Widespread threat: Two-thirds of the US population is facing down a monster winter storm and extreme cold. The storm’s snow and ice will stretch over 2,000 miles from Texas to New England as it ...

A forecast map reveals which states can expect to see "persistent cold" in the weeks ahead, after experts said the polar vortex would unleash waves of icy air across parts of the U.S. through January.

Michigan is experiencing frigid temperatures and heavy snow due to a dip in the jet stream, not the polar vortex. The polar vortex is a large-scale cyclone of cold air that typically stays far north ...

Forecasters say that the polar vortex will usher in waves of frigid air across parts of the U.S. through January. The "more active polar vortex will drive colder air and snow across the central and ...