Tide predictions are not 100% accurate. The predictions are done on the basis of astronomical effects. However, factors such as rainfall, wind, freshwater runoff and other events are not accounted for in the prediction and hence the actual tides may vary from the predicted tide levels. National Oceanic and Atmospheric Administration (NOAA) is the agency that predicts the tides in United States. According to NOAA, the accuracy of tidal predictions for outer coast stations is much higher than that for inland stations. This is because of the effect of local meteorological events on the inland stations, as compared to coastal stations (which are not as much affected by similar events). Another region of low accuracy of tidal predictions is shallow waters.
According to NOAA, for year 2013, the average error between predictions and observations was within 0.147 m.
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