QUOTE:
Isn't the rule of thumb for obstacles from a windsock or anemometer 10 times the obstruction height? Ie. 6m obstruction must be 60m from obstruction?
From memory that may be the internationally agreed MINIMUM separation.
It takes no account of the width or density [think trees] of the obstruction, and is a long way from best practice. Height has a big effect on gustiness, width a big effect on direction and gustiness.
Regarding probabilistic forecasts, the great unwashed have a deep instinctive knowledge of probability, as witness racing odds, National Lottery and many life events. The great unwashed also recognise a lot of time and money being spent on unsound science.