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September 21, 2014

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Motorists navigate northbound U.S. 31 near the I-96 exit in blowing snow and sub-zero conditions Monday morning, Jan. 6, 2014, near Norton Shores, Mich. A whirlpool of frigid, dense air known as a "polar vortex" descended Monday into much of the U.S.

The Muskegon Chronicle, Ken Stevens / AP

Motorists navigate northbound U.S. 31 near the I-96 exit in blowing snow and sub-zero conditions Monday morning, Jan. 6, 2014, near Norton Shores, Mich. A whirlpool of frigid, dense air known as a "polar vortex" descended Monday into much of the U.S.