In message ,
Tudor Hughes writes

Stupid question - sorry. How is the front speed calculated please ?
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Jim

Sulby Glen

Not so much calculated as observed from its passage through places
say 100 miles apart in the direction of travel. Not all cold fronts
have a well-defined time of passage, unfortunately.

Tudor Hughes, Warlingham, Surrey.

Thanks Tudor, it's old fashioned observation and not some nifty maths.

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Jim