ABSTRACT
The Tide Tables provide detailed examples of how to calculate the times and height of tide at intermediate times between consecutive Low and High Waters including instructions on use of the graphs and associated tables of corrections. The values listed for times and heights are predictions based on historical data which is all iterated by a computer programme but using average values for particular locations. Over years, the accumulation of hundreds of thousands of items of recorded data refines the averages which are then used to produce the final predictions. The actual tide levels on a particular day will differ from the predictions if the wind speed or direction is different to the averages which have been used in the calculation. Although storm surges generally are associated with excessive increases in coastal water levels, if the direction of movement of the low pressure system is away from the coast, this can lead to unusually low water levels along a coastline.
