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 ...

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

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 ...

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

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

NORFOLK, Va. — Have you ever wondered why some winters are mild while others bring freezing temperatures and snowstorms? One of the key players in these dramatic shifts is something called the polar ...

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