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Join date : 2010-11-15

PostSubject: Foehn wind   Thu Nov 18, 2010 2:24 pm

A foehn wind or föhn wind is a type of dry down-slope wind which occurs in the lee (downwind side) of a mountain range. It is a rain shadow wind which results from the subsequent adiabatic warming of air which has dropped most of its moisture on windward slopes (see orographic lift). As a consequence of the different adiabatic lapse rates of moist and dry air, the air on the leeward slopes becomes warmer than equivalent elevations on the windward slopes. Föhn winds can raise temperatures by as much as 30 °C (54 °F)[1] in just a matter of hours. Central Europe enjoys a warmer climate due to the Föhn, as moist winds off the Mediterranean Sea blow over the Alps.

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