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

Alabama braces for another polar vortex blast bringing well below freezing temperatures. How cold will temperatures get? Here ...

The polar vortex is set to bring a winter storm to parts of Mississippi with ice, snow. But extreme cold will last for days.

Extremely cold air is going to take over Michigan, as the center of the Polar Vortex drops far south to just north of ...

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 severe weather pattern is caused by disruption of the polar vortex, which normally remains uniform over the North Pole.

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest, Mid-Atlantic and Southern U.S. are expected to see below-freezing ...

A crippling winter storm that could paralyze parts of the Southern and Central U.S. this weekend, and some of the effects ...

Year-round, severe, Artic air is usually kept tightly contained in the North Pole. Arctic wind patterns create a sort of wall ...

A polar vortex is settling over the eastern United States, and temperatures are expected to fall into the weekend, bringing ...

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

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