The continental United States recently finished its soggiest 12 months in 124 years of modern recordkeeping. There have been many reasons for the wet weather, but the 2018-19 record fits with observed long-term increases in overall precipitation and in heavy rainfall events. In the Fourth National Climate Assessment released in 2018 by the U.S. Global Change Research Program, scientists reported: “The frequency and intensity of heavy precipitation events are projected to continue to increase over the 21st century. Mesoscale convective systems (organized clusters of thunderstorms) in the central United States are expected to continue to increase in number and intensity in the future.”

NASA Oklahoma Flooding Images


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