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Datums for 9462620, Unalaska AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9462620, Unalaska, AK
Status: Accepted (Dec 5 2011)
Units: Feet
Control Station:
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW3.60Mean Higher-High Water
MHW3.31Mean High Water
MTL2.12Mean Tide Level
MSL2.08Mean Sea Level
DTL1.80Mean Diurnal Tide Level
MLW0.93Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-2.60Station 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)
Max Tide6.70Highest Observed Tide
Max Tide Date & Time01/27/1960 22:36Highest Observed Tide Date & Time
Min Tide-2.78Lowest Observed Tide
Min Tide Date & Time12/13/2008 08:48Lowest Observed Tide Date & Time
HAT5.22Highest Astronomical Tide
HAT Date & Time12/30/1990 23:18HAT Date and Time
LAT-1.85Lowest 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: 08/08/2018
NOAA / National Ocean Service
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