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Layer represents the geographic location and values of extreme water
levels at the 1%, 10%, 50%, and 99% probabilities at CO-OPS water level stations. Exceedance probability, the likelihood that water levels will exceed a given elevation, is based on a statistical analysis of historic values. This product provides annual exceedance probability levels for select CO-OPS water level stations with at least 30 years of data. The extreme levels measured by the CO-OPS tide gauges during storms are called storm tides, which are a combination of the astronomical tide, the storm surge, and limited wave setup caused by breaking waves. They do not include wave runup, the movement of water up a slope. More information can be found at
http://tidesandcurrents.noaa.gov/est/Extreme_Water_Levels_Users_Guide.pdf and
http://tidesandcurrents.noaa.gov/est/ |