Seasonal Variation of Exceedance Probability Levels
9462620 Unalaska, AK

Seasonal variation of the 1%, 10%, 50%, and 99% exceedance probability levels. The values in meters are relative to the mean higher high water (MHHW) or mean lower low water (MLLW) datums established by CO-OPS.

Extreme Water Levels

Exceedance probability curves versus return period

Tidal datums and exceedance probability levels relative to mean sea level