Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States.

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

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

A polar vortex is expected to bring two surges of extremely cold air to the U.S. in January. Here's what to know in Middle ...

The polar vortex is so back, and in some parts of the country, the weather system will bring with it up to a foot of snow. If “polar vortex” is giving you déjà vu, that’s because we’ve heard it before ...

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

"Potentially hundreds of thousands of people may go without electricity and heat for days, one meteorologist said ...

Boston has seen just one day so far this month where the average temperature was above the seasonal norm, daring me to ask — are you over the cold yet? Astronomical winter hasn’t even arrived (that ...