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Old 29th November 2008 | 18:39
  #66 (permalink)  
liam548
 
Joined: Jan 2008
Posts: 691
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From: Yorkshire
Originally Posted by snapper1
Listen very carefully. I will say this only once. (Spoken in a faux french accent, as in 'Allo Allo'.)

Orographic.

Forced upward movement of air upon encountering a physiographic upland. This lifting can be caused by two mechanisms:
1) The upward deflection of large scale horizontal flow by the Orography.
2) The anabatic or upward vertical propagation of moist air up an orographic slope caused by daytime heating of the mountain barrier surface.
gotcha,

Merci
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