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How To Read Wave & Tide Info
How are tides calculated?
Windfinder uses local and historical data and scientific algorithms to calculate tides. The effects on tides by air pressure or winds are not considered in the tides calculations.
What is the reference height for the tide level heights?
Tide heights are given relative to the "datum" which in most cases is one of several benchmarks corresponding to low tides of varying extremeness. The preferred benchmark in the U.S. is Mean Lower Low Water (MLLW). The odds of the predicted tide getting below MLLW on any given day are about half. The preferred benchmark in the Netherlands is Mean Low Water Springs (MLWS). MLWS is lower than MLLW. The predicted tide will get below MLWS on average only about twice a month. The preferred benchmark in Germany is Lowest Astronomical Tide (LAT). LAT is the lowest tide predicted over a 19 year period. The predicted tide will not get below LAT in that 19 year period, and is unlikely to get below it by any significant amount ever. Some U.S. locations for which a MLLW benchmark was unavailable use an estimated value of MLLW that is derived from the predictions. These estimates tend to yield predictions that differ from National Ocean Service published tables by (0.1 to 0.2) ft.
Why are there no tide forecasts available for my location?
Tide forecasts are available only for spots near a tide station. Windfinder has tide forecast available for approximately 8000 tide stations worldwide.
The tide forecast is inaccurate.
Windfinder uses the tide forecast from the nearest tide station / tide gauge.
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