Arctic Monday for 140 million as 'POLAR VORTEX' barrels across the US: 4,400 flights canceled, schools closed as far south as ATLANTA and the coldest temperatures recorded in 20 years
A man in Flint, Michigan, carries his shovel while walking through the
drifting snow on Monday: The deep freeze is to blame for an estimated 13
deaths so far
Firefighters contend with dangerously cold temperatures and wind as they
battle a structure fire in an industrial park just south of Brookston,
Ind. on Monday
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