A rare polar vortex event could push Arctic air far south this winter, potentially exposing 250 million Americans across 40 states to extreme cold—a phenomenon last seen in 1958 and 1968.
Above: A Von Karman vortex street downwind of the Canary Island chain in the eastern Atlantic Ocean off the coast of Africa on Feb. 27, 2015. Image credit: NASA Worldview. Editor's note: Meteorologist ...
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