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Datums for 9461380, Adak Island AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9461380, Adak Island, AK
Status: Accepted (Sep 6 2017)
Units: Feet
Control Station:
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW3.71Mean Higher-High Water
MHW3.46Mean High Water
MTL2.01Mean Tide Level
MSL2.13Mean Sea Level
DTL1.86Mean Diurnal Tide Level
MLW0.57Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD880.92North American Vertical Datum of 1988
STND-2.96Station Datum
GT3.71Great Diurnal Range
MN2.90Mean Range of Tide
DHQ0.25Mean Diurnal High Water Inequality
DLQ0.56Mean Diurnal Low Water Inequality
HWIGreenwich High Water Interval (in hours)
LWIGreenwich Low Water Interval (in hours)
Max Tide3.88Highest Observed Tide
Max Tide Date & Time12/28/1966 22:24Highest Observed Tide Date & Time
Min Tide-6.01Lowest Observed Tide
Min Tide Date & Time11/26/2003 10:54Lowest Observed Tide Date & Time
HAT5.59Highest Astronomical Tide
HAT Date & Time12/30/1986 23:12HAT Date and Time
LAT-2.10Lowest Astronomical Tide
LAT Date & Time06/22/1986 21:36LAT Date and Time
Tidal Datum Analysis Periods
01/01/1983 - 12/31/2001




Products available at 9461380 Adak Island, AK

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services