A United States record-setting hailstone fell from a powerful supercell thunderstorm moving southeast across central South Dakota. The record-setting hailstone fell near Vivian, South Dakota, and measured 8 inches in diameter, 18.625 inches in circumference, and weighed 1.9375 pounds. This hailstone broke the previous United States record for diameter (7.0 inches – 22 June 2003 in Aurora, NE) and weight (1.67 pounds – 3 September 1970 in Coffeyville, KS). The Aurora, Nebraska hailstone, will retain the record for circumference (18.75 inches). Several other stones of 6 inches or more in diameter were measured during the storm survey. Wowzer!!
