FILE - In this Tuesday, Aug. 29, 2017 file photo, a neighborhood near Houston's Addicks Reservoir is flooded after heavy rains from Tropical Storm Harvey. A study released Monday, Nov. 20, 2017 predicts that summer thunderstorms in North America will likely be larger, wetter and more frequent in a warmer world, dumping 80 percent more rain in some areas and worsening flooding. (AP Photo/David J. Phillip)
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