The brief respite of a January thaw is over as a significant pattern shift readies a return to harsh winter conditions across ...

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

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

Florida faces a historic winter weekend as record-breaking Arctic air sets the stage for potential snowflakes in the ...

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

A Polar vortex has covered the Philadelphia region under a canopy of frigid temperatures, but many people may not realize what a Polar vortex actually is, and the dangers — like frostbite — such ...

Grab your coats, it's getting chilly. A polar vortex broke, and severe temperatures are set to dominate most of the United States, including the Midwest, in the coming days. The polar vortex will ...

As the polar vortex begins to stir, subtle clues point to the coming seasonal shift. So, when will freezing temperatures ...

Boston has seen just one day so far this month where the average temperature was above the seasonal norm, daring me to ask — are you over the cold yet? Astronomical winter hasn’t even arrived (that ...

A disrupted polar vortex is expected to bring cold weather to many parts of the U.S., and potentially snow to some regions. A rare atmospheric event known as sudden stratospheric warming is being ...