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I thought I understood tides but both this page and a cross reference with another site confirms I do not. They say that high tide is 7 hours away and another part of the UK coast (less than a few hundred miles away) will get high tide in an hour.

The way I thought tides worked was a "bulge" of water on the same side of the Earth as the Moon (slightly lagging the Moon's rotation) and another smaller bulge diametrically opposed to it. This is how it's show in all the text books and online videos. I've never been entirely happy that such a massive swell of water can move round the earth so quickly... in addition to all the land masses blocking it.

This image actually makes more sense to me as I can imagine the water has momentum and the land masses channeling it which both delays and adds resistance to its movement but it's fighting some cognitive dissonance with the much simpler mental model I had from before.

My question is: Is this data correct? How do I / you explain the massive difference in high tide times, is it all down to momentum of the water / being trapped by land masses etc?

enter image description here


marked as duplicate by PM 2Ring, Kyle Kanos, David Hammen, John Rennie, Community Sep 5 at 21:22

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