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.

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.

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

Snow and winds are likely to trigger flight cancellations and cause headaches for people traveling to DC for Inauguration Day ...

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

The coldest weather of the season to date will be due to a phenomenon called a polar vortex, an upper-level jet stream that ...

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

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

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