National Weather Service United States Department of Commerce

#4 The Second Costliest Hailstorm in U.S. History

May 8, 2017 Metro Denver, Colorado

A supercell thunderstorm formed in the higher foothills west of Denver during the early afternoon of May 8, 2017, then moved from western suburbs to the northern suburbs, producing large damaging hail, strong winds, heavy rain and flash flooding. Large hail up to baseball size, caused extensive property damage to cars, homes and businesses across a large part of Denver and the western suburbs including Arvada, Lakewood and Wheat Ridge. According to the Rocky Mountain Insurance Agency Association (RMIAA), the storm was Colorado's most expensive insured catastrophe, around $2.3 billion. It also ranked as the second costliest hailstorm in U.S. history, behind the Oct 2010 hailstorms in metropolitan Phoenix, AZ. The RMIAA estimated more than 150,000 auto insurance claims and 50,000 homeowner insurance claims were be filed. 
A radar loop of the supercell that caused $2.3B in damage across metro Denver on May 8, 2017
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