Now it’s official. April’s thunderstorms were big.

The series of storms that wreaked havoc across much of the United States in April rank as the first billion-dollar economic loss event of 2014 that can be attributed to convective thunderstorms, according to Aon Benfield’s monthly Global Catastrophe Recap report, released Wednesday. At least 39 people were killed by flash flooding and severe weather during the storms, which included nearly 70 confirmed tornadoes across more than 20 states in the Plains, Mississippi Valley, Southeast, Midwest and Mid-Atlantic regions.

Insured losses due to the multi-day outbreak will likely end up in the hundreds of millions of dollars, Aon Benfield said.

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