The celestial ballet will on Saturday result in major tides most perceptible in Canada's Bay of Fundy, on the French Atlantic coast, in the Channel and North Sea—but even the Mediterranean will feel the difference.
France's Navy Oceanic and Hydrological Service (SHOM) has warned thrill-seekers to beware when the tide sweeps around Mont Saint-Michel, the ancient abbey-island located on the coast of Normandy.
Saturday's tide on the long, sloping estuary of the River Couesnon at the popular tourist spot will be a whopping 14.15 metres (46 feet)—the height of a four-storey building.
The average tide there is 10.5 metres. Horsburgh, from Britain's National Oceanography Centre, said Saturday's tide would be several centimeters (inches) above last year's maximum overall, and in some places may even be slightly surpassed this September, which will also be an equinox, when high water occurs.
Weather is a big influence on a tide's fierceness—gales can whip up surges able to test the mighty barriers that protect the Netherlands and London from flooding. "A storm surge can elevate water levels by around four metres in the North Sea on the Dutch coast and tend on the east coast of Britain and the Thames estuary to be around two, two-and-a-half metres in the event of a bad storm," Horsburgh told AFP by telephone.
First the aurora borealis and now a solar eclipse and it occurs Friday (the first day of spring) and the same day as a Supermoon.
Where to watch Friday's solar eclipse?
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