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

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

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

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

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

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

The Polar vortex is causing temperatures to plummet dangerously across the Philadelphia region, and frostbite could become a ...

This coming weekend, the central and eastern United States will receive a blast of Arctic air, which will also affect ...

CLEVELAND — The temperature outside was so cold that your fingers, toes, nose and cheeks felt like they were burning. A harsh Arctic cold wave brought record-breaking temperatures to the United States ...

Arctic air originates near the polar regions and is among the coldest air masses on Earth. It typically stays locked in ...