Forecaster Facts #12

If a front/wave pattern develops on the interface between warm and cold air extreme temperature variations can occur in a matter of minutes. On January 22, 1943, Spearfish, South Dakota experienced an event like this. As of 7:30 AM the temperature was -4 degrees Fahrenheit (F), it then rose to 45F by 7:32 AM. Then the the temperature increased to 54F by 9:00 AM before falling back to -4F by 9:27 AM.