Extreme cold warnings span several eastern states as of Friday, with meteorologists warning of frigid wind chills.

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map makes clear which regions are most exposed. Forecast models show a sharp ...

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.

This winter’s harsh run is intensifying, with some of the coldest air so far this season plunging into New Hampshire.

New York is bracing for the coldest air of the winter this weekend, with snow. Learn how the polar vortex is involved.

Much below normal temperatures should persist across the eastern U.S. into early February before moderating slightly.

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