Experts have shared their insights on the 'complex' weather phenomenon amid fears it could leave vast swathes of the country ...

A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by treacherous conditions.

Recent forecasts suggest some Americans might be getting a much-needed break from the freezing temperatures that have gripped much of the country.

The blast of cold that fueled record snowfall across Gulf Coast beaches last week was just the latest to transport frigid air that normally swirls above the North Pole to places much farther south ...

California is on fire while the South freezes ... During the winter, in the northern hemisphere, the polar vortex will expand and send cold air southward, according to the U.S. National Weather ...

Among other states, only very small parts of California and Nevada had monthly temperatures well above their average in January. Elsewhere, a displaced lobe of the polar vortex has brought an ...

Maybe more importantly the southwest flow will bring rain to California and put out any wildfires. At the same time we go into a touch milder southwest flow, the polar vortex will still be ...

Pineapple Express has drenched Northern California in the last few days—but what exactly is it? How common is it? Also, go ...

That frigid feature is the polar vortex, a critical piece of our wintry puzzle that plays a starring role in the heart of winter weather forecasts—and even larger-than-life winter weather myths. DON'T ...