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Optical Effects
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Altocumulus undulatus radiatus spotted over West End, Brisbane, Australia
Altocumulus undulatus radiatus spotted over Taringa, Queensland, Australia
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Altocumulus lenticularis spotted over Black Butte, Oregon, US
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Altocumulus lenticularis over Winthrop, Washington, US
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Noctilucent clouds appear well beyond the altitude of the altocumulus clouds along the horizon, as seen over Hull, East Yorkshire, England
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A large version of altocumulus lenticularis spotted over Dupuyer, Glacier County, Montana, US
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Altocumulus lenticularis over Svalbard, Norway
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Reflections of altocumulus lenticularis over Mirror Lake, Lake Placid, New York, US
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Multiples examples of cumulonimbus incus, also known as anvil clouds, along with a lower layer of altocumulus undulatus, as seen from 37,000 feet above Mississippi, US
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The sheep didn't appear to be interested in the plethora of altocumulus lenticularis over Priddy, Somerset, England
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Virga spotted over Torrejon de Ardoz, Spain
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Altocumulus lenticularis spotted near Combe Hay, Bath, England
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A classic fallstreak hole (cavum) over Blyth South Beach, England
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Altocumulus lenticularis over Taipei, Taiwan
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Altocumulus lenticularis spotted by a friend, Martin Philips, over Hungerford, Berkshire, England
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Altocumulus lenticularis over Italy
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