The tristate hailstorm: The most costly on record

The most damaging hailstorm ever recorded moved from eastern Kansas to southern Illinois during an 8-h period on 10 April 2001, depositing 2.5- to 7.5-cm-diameter hailstones along a 585-km path. A classic long-lived supercell storm was the cause of the record hailfalls. The record-large hailswath size, large and often windblown hailstones, and movement over portions of the St. Louis and Kansas City urban areas led to $1.5 billion in insured losses. This tristate hailstorm and other adjacent hailstorms collectively created $1.9 billion in insured losses in a 2-day period, becoming the ninth most costly weather catastrophe in the United States since property insurance records began in 1949.