Louisiana resident David Key rides away after reviewing the damage to his home. Federal officials have expanded a disaster declaration after flooding in the state damaged tens of thousands of homes and left nine people dead. Max Becherer/AP hide caption

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Louis Fernandez walks along a flooded Collins Avenue in Miami Beach in September 2015. The city is tackling sea-level rise by rebuilding roads and installing new storm sewers and pumps. Lynne Sladky/AP hide caption

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As Waters Rise, Miami Beach Builds Higher Streets And Political Willpower

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Bo Sailor watches Thursday as high surf crashes into the seawall before spilling onto Channel Drive in Montecito, Calif. An ocean-water-quality advisory was issued for the area after a number of December and early-January storms pummeled Southern California with heavy rainfall. Mike Eliason/AP hide caption

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U.S. Weather Wet And Wild In 2015, Though No Big Hurricanes

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Two cars are submerged in floodwaters in a park in Kimmswick, Mo. Gov. Jay Nixon has declared a state of emergency because of widespread flooding around the state, which has closed many roads. Jeff Roberson/AP hide caption

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Delores Downard salvages items from her son's house in Rowlett, Texas on Sunday, the morning after it was struck by a tornado. Rex C. Curry/AP hide caption

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Possible Flooding And Blizzards In North Texas After Weekend Tornadoes

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People paddle past a flooded house as water that breached dams upstream continues to reach the eastern part of the state on October 8, 2015 in Andrews, S.C. Many dams in the state — and across the country — are in need of repair. Joe Raedle/Getty Images hide caption

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An image from aerial footage of flood damage in South Carolina. SCETV/YouTube hide caption

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18 Dams Breached And Death Toll Rises In S.C. Flooding

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A man kayaks on Tall Pines Circle in Columbia, S.C., Sunday. Many parts of South Carolina experienced record rainfall over the weekend, triggering widespread flooding. Sean Rayford/Getty Images hide caption

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Death Toll in Record Carolinas Flooding Now At 13

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Floodwaters from the burst Kinugawa River (left) flow into a residential area (right) in Joso, Ibaraki Prefecture, on Thursday. The city is northeast of Tokyo. Jiji Press/AFP/Getty Images hide caption

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A view of Pearlington, Miss., 10 years after Hurricane Katrina. The East Pearl River and St. Tammany Parish in Louisiana are to the left. David Grunfeld/The Times-Picayune/Landov hide caption

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In Town Hard-Hit By Katrina, Buyouts Offer Opportunity — For Lucky Few

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This is a calculated flood map for the city of St. Louis. Water depth goes from deep (dark blue) to shallow (white, light blue). Floodwater can come from the Illinois, Upper Mississippi and Missouri rivers, as well as from heavy local precipitation. Courtesy of Dag Lohmann/Katrisk hide caption

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Flood Maps Can Get Much Sharper With A Little Supercomputing Oomph

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