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.
The most unusually cold air in the Northern Hemisphere will be over the United States early next week, bringing dangerously frigid conditions.
The polar vortex is a ring of cold air that typically circles the Arctic. A strong jet stream essentially acts like a fence, keeping it locked there. If there's any weakening in the jet stream (the fence), the frigid air can become unstable and spill out. This sends the normally trapped cold air much farther south.
President-elect Donald Trump's second inauguration will mark the coldest presidential ceremony in more than 40 years. Washington is forecast to have temperatures struggling to reach the mid-20s, along with gusty winds.
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.
A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into next week, impacting millions of Americans in nearly all of the contiguous states.
A new blast of Arctic air sweeping from north to south will bring bone-chilling temperatures to millions of Americans this weekend and next week.
People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, a meteorologist says.
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. New
Americans were bracing Thursday for frigid temperatures that forecasters said could produce life-threatening conditions, with Donald Trump's inauguration expected to be the coldest in 40 years.
A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to millions.
Snow and winds are likely to trigger flight cancellations and cause headaches for people traveling to DC for Inauguration Day.