It's official...NOAA's National Climate Extremes Committe has declared a hailstone from a thunderstorm last week from a storm that rolled through South Dakota on July 23rd, to be the largest in diameter and the heaviest ever recorded in the U.S! The storm that rolled through Vivian, SD produced an 8" diameter and 1.9375lbs (1lb 15oz) hailstone with a circumference of 18.62". The previous record holding hailstone was 1.67lbs found in Kansas in 1970. It also surpasses the record for diameter from a hailstone that fell in Nebraska in 2003, but that stone still holds the record for circumference of 18.75".
More information and analysis on the storm can be found
here.
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