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Datums for 9461380, Adak Island AK


Elevations on Station Datum

Station: 9461380, Adak Island, AK
Status: Accepted (Sep 6 2017)
Units: Feet
T.M.: 0
Epoch: 1983-2001
Datum: STND
DatumValueDescription
MHHW6.67Mean Higher-High Water
MHW6.42Mean High Water
MTL4.97Mean Tide Level
MSL5.09Mean Sea Level
DTL4.82Mean Diurnal Tide Level
MLW3.53Mean Low Water
MLLW2.96Mean Lower-Low Water
NAVD883.88North American Vertical Datum of 1988
STND0.00Station 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)
Maximum9.80Highest Observed Water Level
Max Date & Time12/28/1966 22:24Highest Observed Water Level Date and Time
Minimum-0.09Lowest Observed Water Level
Min Date & Time11/26/2003 10:54Lowest Observed Water Level Date and Time
HAT8.55Highest Astronomical Tide
HAT Date & Time12/30/1986 23:12HAT Date and Time
LAT0.86Lowest 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