Much of the U.S. has seen a major dip in temperatures combined with winter storm conditions over the weekend, thanks to an expansion of the polar vortex—the area of cold air that circulates ...

Ben Noll, The Washington Post The polar vortex is coming back. After a half-month hiatus, frigid air will again surge across the United States beginning this weekend through next week, as the ...

During the 2014 January polar vortex, more than 20 people across the country died from the cold as places like Georgia — which rarely see serious cold — dealt with lows under 10 degrees ...

Near-average temperatures are expected west of the Rockies including 30s and 40s for the inner West and Pacific Northwest, 50s and 60s in California, and 60s and 70s in the Desert Southwest.

Much of the U.S. is being blasted by ice, snow and wind, as the polar vortex that dipped south over the weekend is keeping an area stretching from the Rocky Mountains to the coast of Maine in its ...

CHICAGO — Midwesterners trudged ahead Thursday into a familiar, grim reality: temperatures well below zero, schools and businesses closed, stern warnings to wear extra layers or, better yet ...

According to the NWS, the Arctic polar vortex is a powerful band of west-to-east winds that develops in the stratosphere, about 10 to 30 miles above the North Pole, during the winter season.