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

The first cold wave will reach the East Coast on Thursday, followed by another surge of frigid air this weekend and more next ...

Winter has settled in for the long haul, and the next few days only reinforce that feeling. Tonight brings mostly cloudy ...

Here’s the wind chill chart. Notice the four shadings, indicating how long it will take for frostbite. When we get to wind ...

Cold temperatures are expected to last through the end of the month — and forecasters say that there's a potential for snow ...

Ben Gelber, a meteorologist for NBC4 in Columbus, Ohio, and a Pocono native, said the polar vortex is a large, circular pool ...

In the coming weeks, cold air will continue for parts of the U.S. thanks to the influence of the polar vortex.

Severe winter chill is expected to plunge central and eastern states into below average temperatures as the polar vortex ...

The polar jet stream, which is affected by the polar vortex above it, has become quite wavy, allowing Arctic air to ...

A fierce Arctic blast of bitterly cold air is poised to overtake much of the central, eastern and southern U.S. over the next ...

Repeated shots of cold air can be expected through the end of the month and into early February, according to AccuWeather.com ...

Don't let the incoming string of relatively warm days in the greater Philadelphia region fool you; the polar vortex is still around.