Weather Dictionary / Glossary of Terms

Mean Lower Low Water


   Weather TermDescription / Definition
   Mean Lower Low Water (MLLW) - A tidal datum. The average of the lower low water height of each tidal day observed over the National Tidal Datum Epoch. For stations with shorter series, simultaneous observational comparisons are made with a control tide station in order to derive the equivalent datum of the National Tidal Datum Epoch.


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Data courtesy of NOAA - National Oceanic and Atmospheric Administration