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Datums for 9455090, Seward AK


Elevations on Station Datum

Station: 9455090, Seward, AK
Status: Accepted (Sep 29 2011)
Units: Feet
T.M.: 0
Epoch: 1983-2001
Datum: STND
DatumValueDescription
MHHW16.77Mean Higher-High Water
MHW15.85Mean High Water
MTL11.69Mean Tide Level
MSL11.70Mean Sea Level
DTL11.46Mean Diurnal Tide Level
MLW7.52Mean Low Water
MLLW6.14Mean Lower-Low Water
NAVD88
STND0.00Station Datum
GT10.62Great Diurnal Range
MN8.33Mean Range of Tide
DHQ0.91Mean Diurnal High Water Inequality
DLQ1.38Mean Diurnal Low Water Inequality
HWI9.96Greenwich High Water Interval (in hours)
LWI3.70Greenwich Low Water Interval (in hours)
Maximum21.84Highest Observed Water Level
Max Date & Time01/01/1987 22:30Highest Observed Water Level Date and Time
Minimum1.13Lowest Observed Water Level
Min Date & Time12/14/2008 04:54Lowest Observed Water Level Date and Time
HAT19.93Highest Astronomical Tide
HAT Date & Time11/13/1985 22:00HAT Date and Time
LAT2.69Lowest Astronomical Tide
LAT Date & Time06/14/1995 17:00LAT Date and Time
Tidal Datum Analysis Periods
01/01/1983 - 12/31/2001




Products available at 9455090 Seward, AK

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