‘Coldest air in a generation’ hits the Midwest. Officials warn of almost instant frostbite – CNN

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(CNN)Even for the hardiest, cold-tested Americans, the deep freeze sweeping over the Midwest will be brutal.

'If there's global warming, why is it so cold?' Here's why'If there's global warming, why is it so cold?' Here's why
    Water vapor rises above St. Anthony Falls on the Mississippi River on Tuesday in Minneapolis. Water vapor rises above St. Anthony Falls on the Mississippi River on Tuesday in Minneapolis.
    What to know about frostbiteWhat to know about frostbite
    The Chicago area is bracing for historic cold this week as frigid temperatures begin to drop Tuesday. The Chicago area is bracing for historic cold this week as frigid temperatures begin to drop Tuesday.
    Frost covers part of the face of a University of Minnesota student  Tuesday.Frost covers part of the face of a University of Minnesota student  Tuesday.
    A worker shovels snow off the rail switches.  A worker shovels snow off the rail switches.
    Sarah Allen clears her driveway and sidewalks with a snowblower in Flint, Michigan.Sarah Allen clears her driveway and sidewalks with a snowblower in Flint, Michigan.