Tidal anomalies.
Can you be more specific about the nature of these anomalies? While I have not seen any anomalies that can not be explained by current models of tides, I have seen conditions that make predictions not entirely accurate.
The largest of these is the wind. Because tidal predictions are based on the position of the Sun, Moon and basin characteristics, they can not take into account the fluctuations in range that are caused by the wind. If the wind is blowing the water up into a basin the tide will be higher or earlier than predicted, and the contrary is true if the wind is blowing the water out of a basin.
Here is an explanation from a book...
Tides are superimposed on non-tidal rising falling water levels, caused by weather, seismic events, or other natural forces. Similarly, tidal currents are superimposed upon non-tidal currents such as normal river flows, floods and freshets.
and...
Observed tides will differ considerable from the tides predicted by equilibrium theory since size, depth and configuration of the basin or waterway, friction, land masses, inertia of water masses, Coriolis acceleration and other factors are neglected in this theory. Nevertheless, equilibrium theory is sufficient to describe the magnitude and distribution of the main tide-generating forces across the surface of the Earth.