OutrunMarine
Search

Weather & Water

Water level

Technical visualPrediction and observation
Prediction and observationA smooth predicted tide curve is shown below a storm-elevated observed water-level trace. OBSERVEDPREDICTED
Prediction and observationA smooth predicted tide curve is shown below a storm-elevated observed water-level trace. 121OBSERVED2PREDICTED
Astronomical predictions and observed water level are separate; weather and other effects can create differences.

The observed or predicted height of the water surface relative to a stated datum.

Actual water level can differ from astronomical tide because of:

wind

atmospheric pressure

river flow

storm surge

seiches

other hydrodynamic effects

Always display the datum.

All Learn references