A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the ...

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.

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

A series of disturbances in the atmosphere is sending the polar vortex south (again) next week with a burst of even colder ...

A disruption in the polar vortex is about to send an Arctic air mass from Siberia as far south as Florida. Yes, Siberia—and ...

With last week's freeze being the second time temperatures dipped below freezing this winter, many are wondering if this ...

How the Polar Vortex Can Bring Arctic Blasts to the U.S. Vast weather patterns can carry blasts of frigid air far from the ...

It's like "bomb cyclone" or "firenado." It seems like the sort of phenomenon that would be responsible for the ...

The cold temperatures are coming from a not uncommon expansion in the Polar Vortex, which are counter-clockwise rotating air ...

A deep freeze, thanks to the polar vortex dipping down from Siberia, will bring frigid temperatures to nearly 300 million ...

A series of cold fronts the last few weeks has kept Florida downright chilly, as another winter storm starts to take aim this ...