Notice: On Sunday, January 12, 2025, beginning around 2:00 pm EST through Monday, January 13, 2025, IT system maintenance will be performed that may impact the https://TidesAndCurrents.noaa.gov website. There may be periods of time where the website will be running with limited capabilities.
Datum | Value | Description |
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MHHW | Mean Higher-High Water | |
MHW | Mean High Water | |
MTL | Mean Tide Level | |
MSL | Mean Sea Level | |
DTL | Mean Diurnal Tide Level | |
MLW | Mean Low Water | |
MLLW | Mean Lower-Low Water | |
STND | Station Datum | |
GT | Great Diurnal Range | |
MN | Mean Range of Tide | |
DHQ | Mean Diurnal High Water Inequality | |
DLQ | Mean Diurnal Low Water Inequality | |
HWI | Greenwich High Water Interval (in hours) | |
LWI | Greenwich Low Water Interval (in hours) | |
Max Tide | Highest Observed Tide | |
Max Tide Date & Time | Highest Observed Tide Date & Time | |
Min Tide | Lowest Observed Tide | |
Min Tide Date & Time | Lowest Observed Tide Date & Time | |
HAT | Highest Astronomical Tide | |
HAT Date & Time | HAT Date and Time | |
LAT | Lowest Astronomical Tide | |
LAT Date & Time | LAT Date and Time |
Tidal Datum Analysis Periods |
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