Negative Surges :
In a manner somewhat similar to storm surges the level of sea can can also be lower than the predicted level. Again the cause is meteorological. It makes a lot of difference to very large vessels which may be navigating with very small under keel clearance. Negative surges of over 0.6 m occur about 15 times a year in the southern North Sea, 3 or 4 times exceeding 1m.
Warning of onset of negative surges in the southern North Sea is given by a warning service to mariners.
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