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Datums for 9455090, Seward AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9455090, Seward, AK
Status: Accepted (Sep 29 2011)
Units: Feet
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW10.63Mean Higher-High Water
MHW9.71Mean High Water
MTL5.55Mean Tide Level
MSL5.56Mean Sea Level
DTL5.32Mean Diurnal Tide Level
MLW1.38Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-6.14Station 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)
Max Tide15.70Highest Observed Tide
Max Tide Date & Time01/01/1987 22:30Highest Observed Tide Date & Time
Min Tide-5.01Lowest Observed Tide
Min Tide Date & Time12/14/2008 04:54Lowest Observed Tide Date & Time
HAT13.93Highest Astronomical Tide
HAT Date & Time11/13/1985 22:00HAT Date and Time
LAT-3.50Lowest Astronomical Tide
LAT Date & Time05/25/1990 16:42LAT 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
Web site owner: Center for Operational Oceanographic Products and Services