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Old July 8th 15, 02:52 PM posted to uk.sci.weather
Graham Easterling[_3_] Graham Easterling[_3_] is offline
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Default Met Met Office explanation of Heathrow record

I use the method of swimming off the Battery Rocks , Penzance with a piece of string, a thermometer and a weight. I then measure the temperature around 2 ft down, and try to read the temperature without drowning.

The SST at Sevenstones shows a marked tidal and diurnal range. The wind direction and swell size clearly are important as well.

Graham
Penzance