This letter examines the magnitude, spatial footprint, and paths of hurricanes and extratropical cyclones (ETCs) that caused strong surge along the east coast of the US between 1979 and 2013. Lagrangian cyclone track information, for hurricanes and ETCs, is used to associate surge events with individual storms. First, hurricane influence is examined using ranked surged events per site. The fraction of hurricanes among storms associated with surge decreases from 20%–60% for the top 10 events to 10%–30% for the top 50 events, and a clear latitudinal gradient of hurricane influence emerges for larger sets of events. Secondly, surges on larger spatial domains are examined by focusing on storms that cause exceedance of the probabilistic 1-year surge return level at multiple stations. Results show that if the strongest events in terms of surge amplitude and spatial extent are considered, then hurricanes are most likely to create the hazards. However, when slightly less strong events that still impact multiple areas during the storm life cycle are considered, the relative importance of hurricanes shrinks as that of ETCs grows. Furthermore we find distinct paths for ETCs causing multi-site surge at individual segments of the US east coast.
Department of Earth and Atmospheric Sciences and NOAA CREST, City College of the City University of New York, USA;Program in Earth and Environmental Sciences, Graduate Center, City University of New York, New York, New York, USA;Wegener Center for Climate and Global Change and IGAM/Institute of Physics, University of Graz, Graz, Austria;Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, USA;Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, USA
Recommended Citation:
J F Booth,H E Rieder,Y Kushnir. Comparing hurricane and extratropical storm surge for the Mid-Atlantic and Northeast Coast of the United States for 1979–2013[J]. Environmental Research Letters,2016-01-01,11(9)