A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans. See maps of the arctic blast.

Under the Rotunda of the U.S. Capitol, Donald Trump was again inaugurated, this time as the 47th president of the United States, capping a historic return to power that serves as resounding rebuke to the established political order.

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

A brutal polar vortex is set to bury the Big Apple in snow Sunday and then deliver deadly single-digit temperatures that will feel like 15 degrees below zero.

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

Most of the country will likely be hit by an arctic blast this weekend into early next week as the polar vortex ushers ... reach the single digits in Washington, D.C., Philadelphia and Boston.

Many people across the United States may recall the polar vortex episode of early 2014. For the Midwest, it turned out to be the coldest winter in over 30 years. In Washington, D.C., January 2014 ...

The arctic blast is expected to affect millions of people across the United States with brisk winds, and dangerously cold wind chills expected to dip as low as 30 to 55 degrees below zero, says the NO

Many people across the United States may recall the polar vortex episode of early 2014. For the Midwest, it turned out to be the coldest winter in over 30 years. In Washington, D.C., January 2014 ...

However, a deep freeze, thanks to the polar vortex dipping down from Siberia ... Inauguration Day weather forecast for Washington, D.C. For the presidential inauguration on Monday in Washington ...

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