 Complete the following phrase:  As the strong wind passed over the North Sea, a storm surge was recorded all along the east coast of the United Kingdom on 3 January, advancing from the northern North Sea, water levels in the north of England rose higher than those of the North Sea flood of 1953, although they were lower in the south. The storm surge was far more severe on the north German coast reaching levels never previously recorded, reaching 6.45 m above mean sea level at Hamburg 4.5 m above mean high water levels. Fortunately dykes had been raised after the devastating 