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 ...

A significant portion of the U.S. is experiencing below-average temperatures due to a disrupted polar vortex, affecting over ...

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.

And it won’t just feel cold: A series of clipper storms is also expected to bring snow to the region beginning on the evening ...

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

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

With over 170 million Americans facing below average temperatures, even colder air may be on the horizon thanks to the ...

A major polar vortex is about to hit the US and could bring weeks of frigid temperatures for millions, with even a chance of ...

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