Abstract

Abstract. Recent tropical cyclones, like Hurricane Katrina, have been some of the worst the United States has experienced. Tropical cyclones are expected to intensify, bringing about 20 % more precipitation, in the near future in response to global climate warming. Further, global climate warming may extend the hurricane season. This study focuses on four major river basins (Neches, Pearl, Mobile, and Roanoke) in the southeastern United States that are frequently impacted by tropical cyclones. An analysis of the timing of tropical cyclones that impact these river basins found that most occur during the low-discharge season and thus rarely produce riverine flooding conditions. However, an extension of the current hurricane season of June–November could encroach upon the high-discharge seasons in these basins, increasing the susceptibility for riverine hurricane-induced flooding. Our results indicate that 28–180 % more days would be at risk of flooding from an average tropical cyclone with an extension of the hurricane season to May–December (just 2 months longer). Future research should aim to extend this analysis to all river basins in the United States that are impacted by tropical cyclones in order to provide a bigger picture of which areas are likely to experience the worst increases in flooding risk due to a probable extension of the hurricane season with expected global climate change in the near future.

Highlights

  • In the southeastern United States tropical cyclones are some of the most severe rain events (Schumacher and Johnson, 2006)

  • Half of the United States population lives within only ∼ 80 km of the coast (NSB, 2007), and, on average, areas that are prone to tropical cyclones are 5 times more heavily populated than the rest of the nation (Frey et al, 2010)

  • Most tropical cyclones impacting these four basins occur during September, or the middle of the low-discharge season (Figs. 2 and 3)

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Summary

Introduction

In the southeastern United States tropical cyclones are some of the most severe rain events (Schumacher and Johnson, 2006). While tropical cyclones occur less frequently than other rain-producing events, they cause the most damage because they cover a large geographic area and often cause widespread flooding (Greenough et al, 2001; Mousavi et al, 2011; Schumacher and Johnson, 2006). Half of the United States population lives within only ∼ 80 km of the coast (NSB, 2007), and, on average, areas that are prone to tropical cyclones are 5 times more heavily populated than the rest of the nation (Frey et al, 2010). Flooding from high storm surges during hurricanes has caused approximately 14 600 deaths over the last cen-

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