Storm Surge Inundation and Hurricane Strike Frequency Map

Posted on: 2/05/2015 - Updated on: 2/27/2020

Posted by

Rachel Gregg


This map illustrates current worst-case coastal storm surge or inundation scenarios and hurricane strike frequency derived from:

  • Sea, Lake, and Overland Surge from Hurricanes (SLOSH) models by the National Oceanic and Atmospheric Administration (NOAA)
  • 100 and 500 year flood plains from the Federal Emergency Management Agency (FEMA); and
  • Hurricane strike dataset from the National Hurricane Center (NHC).

What is Storm Surge Inundation?  The abnormal rise of water generated by a storm, over and above the predicted astronomical tides.

Were the same analytical methods and assumptions used to develop the FEMA flood plain and SLOSH model maps? The FEMA flood plain maps focus on riverine and coastal flooding. The SLOSH model map focuses on storm surge inundation. For a detailed explanation of the differences in approach, read "Two Coastal Flood Inundation Maps" (PDF) (5 pp, 611K, About PDF)

Hurricane Strike Frequency  The NHC maintains a hurricane strike dataset (.xls, 295K) for U.S. coastal counties, including direct and indirect strikes from all hurricane categories during 1900-2009 (last updated February 4, 2010).


Coastal managers, policy makers, local/regional authorities

Managing Organizations

Climate change impacts pose challenges to drinking water, wastewater, and stormwater (water sector) utilities in fulfilling their public health and environmental missions. Extreme weather events, sea level rise, shifting precipitation and runoff patterns, temperature changes, and resulting changes in water quality and availability contribute to a complex scenario of climate change challenges that have potentially significant implications for the sustainability of the water sector.

The Environmental Protection Agency is an independent executive agency of the United States federal government tasked with environmental protection matters. The Environmental Protection Agency has ten Regional offices, each of which is responsible for the execution of the Agency's programs within several states and territories.


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