U.S. insured losses from severe weather in April and May reached an estimated $15 billion--almost three times the annual average for severe weather losses in the last 20 years, according to a new report published by Aon Benfield's Impact Forecasting.
Total economic losses, including those not covered by insurance, added up to $21.65 billion.
The report examines the impact from storms that occurred across the country east of the Rocky Mountains during eight separate timeframes, including five outbreaks that produced insured losses of more than $1 billion each.
The two most notable stretches occurred April 22 to 28 and May 21 to 27. The late-April storm series featured 334 separate tornado touchdowns through the Southeast and Tennessee Valley, including a devastating twister in Tuscaloosa, Ala. The storm series was the largest tornado outbreak in world history, according to the report. The late-May stretch included the powerful tornado that destroyed a large section of Joplin, Mo.
"The tornado led to 154 fatalities in the city, becoming the deadliest singular tornadic event since the National Weather Service officially began keeping records in 1950," Steve Jakubowski, president of Impact Forecasting, said in a statement. "In addition, it is worth noting that the Tuscaloosa and Joplin events will go down as two of the costliest singular tornadoes ever recorded."