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Old 24th Nov 2010, 07:54
  #7059 (permalink)  
dalek
 
Join Date: Sep 2005
Location: preston
Age: 72
Posts: 370
Walter has always been spot on with his last point.

A 15 to 25 kt tailwind striking a cliff face will cause compression and updraft.
This will give an increase of speed and also considerable updraft causing a high ROC.
It will also generate vortices creating moderate to severe turbulence, plus local downdraughts within the general updraft.
This makes all analysis/ simulation and even flights trying to match the exact conditions all speculative.
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