President-elect Donald Trump's second inauguration will mark the coldest presidential ceremony in more than 40 years.

A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans.

The most unusually cold air in the Northern Hemisphere will be over the United States early next week, bringing dangerously ...

The polar vortex is a ring of cold air that typically circles the Arctic. A strong jet stream essentially acts like a fence, ...

A dangerous and potentially life-threatening stretch of cold weather has much of the U.S. on alert as a lobe of the polar ...

Some areas of the U.S. may see temperatures as low as -20 or -30 degrees early next week as arctic air from Siberia rolls in.

People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, ...

A brutal polar vortex is set to bury the Big Apple in snow Sunday and then deliver deadly single-digit temperatures that will ...

Temperatures are expected to plummet over the weekend, bringing life-threatening conditions to large stretches of the United ...

Americans were bracing Thursday for frigid temperatures that forecasters said could produce life-threatening conditions, with ...

A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to ...