Record-Breaking Hailstone in Vivian, South Dakota
Record-Breaking Hailstone in Vivian, South Dakota
US · Published Nov 11, 2026
• On July 23, 2010, a supercell thunderstorm in Vivian, South Dakota, produced the largest and heaviest hailstone ever recorded in the United States.
• The hailstone, collected by resident Les Scott, was measured by the National Weather Service (NWS) at 8.0 inches (20.32 cm) in diameter and 1.9375 pounds (0.879 kg) in weight.

Impact & Risks

The supercell storm caused widespread damage in Vivian, South Dakota, and surrounding areas. Five hail-related injuries were reported, along with structural damage to buildings and major vehicle damage along Interstate 90. The storm's strong updrafts and high instability created conditions for exceptionally large hail, posing risks to both people and property. Such storms highlight the dangers of severe weather, including hail, high winds, and tornadoes.

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