Lenticular cloud

Lenticular cloud

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Credit: PEKKA PARVIAINEN/SCIENCE PHOTO LIBRARY

Caption: Lenticular clouds. Lenticular cloud over a snow- covered mountain. High winds have drawn the cloud out towards the left. These lens-shaped cloud formations often occur in stacks. They are produced when moist air ascends over a mountain range: as the stream of air passes over the ground it may form a standing wave (called a lee wave). The air rising to the crest of this wave may be cooled sufficiently to condense, forming lenticular clouds. Photographed over Mount Sanford, Alaska, USA, in 1989.

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Keywords: 1900s, 1989, 20th century, alaska, american, august, cloud, cloud forms, cloud types, clouds, lee wave, lenticular cloud, meteorological, meteorology, mount sanford, mountain, north america, north american, orographic, snow, snowy, summer, united states, us, usa, volcano, vulcanology

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