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Current Datum Value: 11.70

Datums for 9433445, Half Moon Bay OR


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9433445, Half Moon Bay, OR
Status: Accepted (Mar 5 2014)
Units: Feet
Control Station: 9432780 Charleston, OR
T.M.: 120
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW7.14Mean Higher-High Water
MHW6.49Mean High Water
MTL3.84Mean Tide Level
MSL3.81Mean Sea Level
DTL3.57Mean Diurnal Tide Level
MLW1.20Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-11.70Station Datum
GT7.14Great Diurnal Range
MN5.29Mean Range of Tide
DHQ0.65Mean Diurnal High Water Inequality
DLQ1.20Mean Diurnal Low Water Inequality
HWI8.09Greenwich High Water Interval (in hours)
LWI1.80Greenwich Low Water Interval (in hours)
Max TideHighest Observed Tide
Max Tide Date & Time Highest Observed Tide Date & Time
Min TideLowest Observed Tide
Min Tide Date & Time Lowest Observed Tide Date & Time
HAT9.08Highest Astronomical Tide
HAT Date & Time12/31/1986 19:36HAT Date and Time
LAT-2.46Lowest Astronomical Tide
LAT Date & Time06/23/1986 15:12LAT Date and Time
Tidal Datum Analysis Periods
06/01/2013 - 09/30/2013




Products available at 9433445 Half Moon Bay, OR

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services