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Datums for 9461710, Atka AK


Elevations on Station Datum

Station: 9461710, Atka, AK
Status: Accepted (Aug 9 2017)
Units: Feet
T.M.: 0
Epoch: 1983-2001
Datum: STND
DatumValueDescription
MHHW30.36Mean Higher-High Water
MHW30.14Mean High Water
MTL28.79Mean Tide Level
MSL28.91Mean Sea Level
DTL28.66Mean Diurnal Tide Level
MLW27.44Mean Low Water
MLLW26.94Mean Lower-Low Water
NAVD8827.84North American Vertical Datum of 1988
STND0.00Station Datum
GT3.41Great Diurnal Range
MN2.70Mean Range of Tide
DHQ0.22Mean Diurnal High Water Inequality
DLQ0.50Mean Diurnal Low Water Inequality
HWIGreenwich High Water Interval (in hours)
LWIGreenwich Low Water Interval (in hours)
Maximum32.50Highest Observed Water Level
Max Date & Time01/18/2008 20:48Highest Observed Water Level Date and Time
Minimum24.22Lowest Observed Water Level
Min Date & Time12/13/2008 09:12Lowest Observed Water Level Date and Time
HAT31.83Highest Astronomical Tide
HAT Date & Time12/30/1990 23:00HAT Date and Time
LAT25.10Lowest Astronomical Tide
LAT Date & Time06/22/1986 21:42LAT Date and Time
Tidal Datum Analysis Periods
03/01/2008 - 02/28/2009
12/01/2011 - 11/30/2014
05/01/2015 - 04/30/2016




Products available at 9461710 Atka, AK

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