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On January 22, 1943, the northern and eastern slopes of the Black Hills of South Dakota were at the western edge of an Arctic airmass and under a temperature inversion. A layer of shallow Arctic air hugged the ground from Spearfish to Rapid City. At about 7:30am MST, the temperature in Spearfish was -4 degrees Fahrenheit. The Chinook kicked in, and two minutes later the temperature was 45 degrees above zero. The 49 degree rise in two minutes set a world record that is still on the books. By 9:00am, the temperature had risen to 54 degrees. Suddenly, the Chinook died down and the temperature tumbled back to -4 degrees. The 58 degree drop took only 27 minutes.

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