Home > Extra-Tropical Storm Surge documentation
The Extra-Tropical Storm Surge model (ETSS) is a modification of the Sea Lake and Overland Surges from
Hurricanes (SLOSH) model that uses hourly 13 km Global Forecast System (GFS) wind and pressure
outputs as atmospheric forcing to predict storm surge from large extra-tropical storms. It produces
hourly storm tide inundation (based on storm surge + tide) for the continental U.S. and Alaska
coastlines. It utilizes an initial water level condition in each computational domain that is derived by the
average of the 5-day anomalies for the various stations in those domains, where the station specific 5-
day anomaly is defined as the 5-day average hourly anomaly (observation – (surge + tide)). Additionally,
the post processing stage combines the ETSS surge guidance with station based tidal predictions and
observations (where available) to create bias-corrected total water level guidance.
Additional ETSS Information:
MDL Storm Surge Webpage
OPC ETSS Webpage
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