The polar vortex, a high-altitude ring of westerly winds that usually keeps Arctic air locked near the pole, is showing signs of unusual weakening. If that circulation falters or collapses, the result ...

Despite a warming climate, bone-chilling winter cold can grip parts of the U.S.—and this study explains why. Researchers found that two specific patterns in the polar vortex, a swirling mass of cold ...

The polar vortex's blast of Arctic air from Canada brought the season's coldest weather to the central U.S. The vortex is forecast to provide frigid weather with "a free ride," according to ...

While much of the eastern U.S. has been frozen by rounds of Arctic air and snow, the West has experienced weeks of unseasonable warmth, which has left many mountain ranges in a snow drought. A major ...

BOEING MANUFACTURE THIS KIND OF PLANE. TURNING NOW TO KCRA 3 WEATHER, AND WE WANT TO SHOW YOU THIS A LIVE LOOK AT LAKE TAHOE AFTER DAYS OF SNOWY WEATHER AND TOUGH TRAVEL CONDITIONS. HEATHER, IT’S NICE ...

Face it — "polar vortex" is fun to say. It sounds like something that could have killed a red-shirted crewmember on the original "Star Trek" television series. Maybe that's why a weather feature that ...