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

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

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest ...

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

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.

More snow is on the way for southern Ontario, with a widespread shot occurring on Wednesday. That will be followed by ...