August 21 marks the anniversary of the largest hailstone on record in South Dakota

 

 

On August 21, 2007, a supercell thunderstorm produced what would be the record size hailstone for the state of South Dakota, officially measuring  6 and 7/8 inches in diameter with a circumference of 18 inches.   For more information on this damaging and record event, follow the link to the official web page.



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