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Datums for 9462620, Unalaska AK


Elevations on Station Datum

Station: 9462620, Unalaska, AK
Status: Accepted (Dec 5 2011)
Units: Feet
T.M.: 0
Epoch: 1983-2001
Datum: STND
DatumValueDescription
MHHW6.20Mean Higher-High Water
MHW5.91Mean High Water
MTL4.72Mean Tide Level
MSL4.68Mean Sea Level
DTL4.40Mean Diurnal Tide Level
MLW3.53Mean Low Water
MLLW2.60Mean Lower-Low Water
NAVD88
STND0.00Station Datum
GT3.60Great Diurnal Range
MN2.39Mean Range of Tide
DHQ0.28Mean Diurnal High Water Inequality
DLQ0.93Mean Diurnal Low Water Inequality
HWI2.79Greenwich High Water Interval (in hours)
LWI8.98Greenwich Low Water Interval (in hours)
Maximum9.30Highest Observed Water Level
Max Date & Time01/27/1960 22:36Highest Observed Water Level Date and Time
Minimum-0.18Lowest Observed Water Level
Min Date & Time12/13/2008 08:48Lowest Observed Water Level Date and Time
HAT7.82Highest Astronomical Tide
HAT Date & Time12/30/1990 23:18HAT Date and Time
LAT0.75Lowest Astronomical Tide
LAT Date & Time06/22/1986 21:00LAT Date and Time
Tidal Datum Analysis Periods
01/01/1997 - 12/31/2001




Products available at 9462620 Unalaska, AK

Revised: 10/15/2013
NOAA / National Ocean Service
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