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

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

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

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

The displaced polar vortex will bring prolonged periods of cold to the eastern portion of the Lower 48 through the end of ...

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

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

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

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