Shock of deadly floods is a reminder of Appalachia’s risk from violent storms in a warming climate

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Shock of deadly floods is a reminder of Appalachia’s risk from violent storms in a warming climate
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Hurricane Helene dumped heavy rain on a mountainous region hundreds of miles away from the coast.

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Hurricanes moving inland with heavy rainstorms have created disaster before. In 2004, for example, four people were killed in western North Carolina from a debris flow caused by as much of a foot of rain that fell from Hurricane Ivan.Plus, a warmer atmosphere can hold more water, fueling intense rainstorms, although mountainous Appalachian terrain complicates the interaction between weather events and climate change, according to Jim Smith, a hydrologist at Princeton University.

Porter, the climate risk researcher, said the Federal Emergency Management Agency’s flood maps used to determine the riskiest areas where certain homeowners are required to purchase flood insurance have their limitations. He said the maps consider a specific range of flooding and underestimate flood risk in some areas — and that the problem is especially pronounced in parts of Appalachia.

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