- Clouds formed as a result of orography, or terrestrial relief. If a mass of moist air moves against a hill, it will rise and cool. Clouds will form if in this process the condensation level is reached and precipitation can occur. If precipitation does not occur, the cloud base on the leeward sides will be higher than the clouds on the windward side of the hill. As these clouds are linked with the form of the terrestrial relief, they generally move very slowly, if at all. The winds at the same level may be very strong.
Aviation dictionary. 2014.
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orographic clouds — /ˌɒrəgræfɪk ˈklaʊdz/ (say .oruhgrafik klowdz) plural noun clouds formed, under suitable conditions, by the passage of air over a mountain or ridge … Australian English dictionary
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orographic — Anything that pertains to, or is caused by, mountains, as in orographic clouds, orographic lift, or orographic precipitation. See orographic clouds … Aviation dictionary
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