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Altocumulus floccus spotted over National Taipei University, Taiwan
A stack of lenticular clouds, also known as "pile d'assiettes", spotted over Estepona, Spain
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Fallstreak Hole (Cavum) spotted over Woodinville, Washington, US
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Altocumulus undulatus spotted during the early morning along the Hamakua Coast, Big Island, Hawaii, US
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Altocumulus undulatus spotted from the Noko Ferry Terminal, Fukuoka City, Japan
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Fluctus (Kelvin-Helmholtz) and its surf-like waves spotted on a windy morning over Cornwall, England
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A classic example of a spaceship looking altocumulus lenticularis, captured by Richard's wife, Andrea Gessner Friedman, spotted over the foothills of the Catalina Mountains, Tucson, Arizona, US
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Altocumulus lenticularis duplicatus spotted over the mountains, from the Missouri River near Wolf Creek, Montana, US
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A plethora of altocumulus lenticularis near Gulfoss, Iceland
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Altocumulus lenticularis duplicatus, also known as "pile d'assiettes", a term used for a series of lenticular clouds, stacked one above the other, caused by wave motion in multiple humid layers of air, as seen here over the Sandia Mountains, Albuquerque, New Mexico, US
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Altocumulus stratiformis radiatus over Troy, Michigan, US
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Altocumulus lenticularis duplicatus accompanied by Mt. Rainier in a majestic pairing near Seattle, Washington, US
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Supercilium, an unofficial classification for a short-lived cloud feature, which appear in turbulent airflow over, and to the immediate lee of, steep mountain peaks during periods of strong mountain summit level winds. This classic example was spotted near Busquistar, Andalusia, Spain.
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Altocumulus lenticularis duplicatus spotted near Capdenac, Lot, France
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Altocumulus lenticularis duplicatus, also known as pile d'assiettes, spotted over Hexham, Northumberland, England
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Altocumulus lenticularis duplicates with cumulus fractus in the foreground, spotted over Patagonia, Argentina
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