A flash of light …
Many moon's ago, I posted my first reply to the uk.sci.weather newsgroup. It was an addled misconception that I had, concerning the regional way that tides behave.
Someone had asked why, after a small snow shower, some roads and gardens would be covered and others near-by were not.
In Britain, a tidal pulse moves around the coast like a three phase induction. Dover and Liverpool and somewhere in Orkney have an high tide. At the same time, Bristol Hull and somewhere off Cork in Ireland, have a low tide.
Tidal tables are based on the above ports. What you do is add or subtract the time of high or low water for your location. (In another table, given in the appendix.)
Tide tables are little booklets you can put in your shirt pocket, designed for occasional reference if you go out in a small boat. They are just printings of the tidal charts for the nearest large port.
The sort of thing you might have on you in a pub, when a friend asks you to set up a fishing expedition.
The one I used in my youth was Laver's Liverpool tide tables.
Abergele was 20 minutes earlier (or was it later?) than Liverpool. And Bangor, at the mouth of the Menai Straight, was (IIRC) 2 hours and 28 minutes earlier(?)
Years later, after moving to Abergele, I spent a lot of time on the beach wondering about the odd behaviour of the weather in that bay.
It seemed connected to the tides somehow. But it just wouldn't run true with the tables or the weather forecasts. Time and again I'd be out in an hailstorm wondering at the occurrence at high or low water.
And then the next time, nothing!
Then there was the way the waves left the sand. Sometimes it piled it up on one end of the beach and left it there unmolested until another high water a few weeks later would move it all back out.
And every tide, the pebbles in the sand would be left in inverted arches of perfect geometry. And with another period, there would be just plain sand or no distinguishable pattern of sand and pebbles.
It was very frustrating and also very engaging.
It was like being married.
To someone you loved.
I forget what the consensus of opinion was with my first Usenet post. (Heat Islands in towns I think.)
I couldn't refrain from adding my two ha'pence that it was a tidal effect.