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Lenticular cloud, Greece.
Lenticular cloud, Greece. Lenticularis lentil-shaped (from lenticula lentil) are stationary clouds that form mostly in the troposphere, typically in parallel alignment to the wind direction. They are often comparable in appearance to a lens or saucer. Nacreous clouds that form in the lower stratosphere sometimes have lenticular shapes. These lens-shaped orographic wave clouds form when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere., by DAVID PARKER/SCIENCE PHOTO LIBRARY
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