Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

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

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

Michigan is set for several days of frigid temperatures and heavy lake-effect snow as Arctic air continues its slow march ...

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 ...

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

The brief respite of a January thaw is over as a significant pattern shift readies a return to harsh winter conditions across ...

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

Each of these lobes of the Polar Vortex will bring two or three days of bitterly cold, below-normal temperatures. We aren’t ...

Ben Gelber, a meteorologist for NBC4 in Columbus, Ohio, and a Pocono native, said the polar vortex is a large, circular pool of the coldest air in North America that typically hovers high in the ...

The Arctic Oscillation is a metric used to describe the strength of the polar vortex, or mass of arctic air that rotates ...