It's because car speeds are measured in mph in the UK and it is thought that the
general public would be better able to understand wind speeds in those units.

As a British professional meteorologist, I of course prefer knots, but I can
handle the SI metres per sec equally as well. Kilometres per hour usually throws
me though !

The SI unit for temperature is Kelvin BTW not degrees Celsius so the BBC use
non-SI for temperature too, thank goodness :-)

Will.
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Simon Gardner [dot]co[dot]uk wrote in message ...
Can anyone offer a satisfactory explanation as to why the BBC uses MPH for
windspeed on its otherwise SI weather forecasts?