The tide is a wave that runs round each ocean basin. High water (the white line) sweeps around amphidromic points, where there is almost no tide at all, anticlockwise in the northern hemisphere and mostly clockwise in the southern. The North Sea has its own amphidromes: one in the Southern Bight between England and the Netherlands and one in the middle of the North Sea, with a third close to southern Norway. Colours show the height above or below mean sea level, up to 4 m and beyond in places such as the Bay of Fundy, the Bristol Channel and Patagonia. Shown at spring tide, just after the new moon of 10 October.
Source: Model: E.U. Copernicus Marine Service, Global Ocean Physics Analysis and Forecast, hourly ocean tide elevation
Free for personal and educational use with credit to The Moving Sea. For commercial use, contact [email protected].