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Optical Effects
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Altocumulus with some signs of lenticularis formations, spotted over El Paso, Texas, US
Altocumulus lenticularis spotted over Melbourne, Australia
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A plethora of altocumulus lenticularis throughout the sky over Blairgowrie, Perthshire, Scotland
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Altocumulus stratiformis undulatus, also known as a "mackerel sky", spotted in the morning over Banqiao District, New Taipei City, Taiwan
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Altocumulus intercepted by contrails over Zhongshan District, Taipei City, Taiwan
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Morning sky with signs of altocumulus lenticularis in the distance, spotted near Arnhem, Netherlands
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Altocumulus lenticularis near Alice Springs, Northern Territory, Australia
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Westerly winds sweeping over the crest of the Sierra Mountains created long strings of lenticular clouds that developed into a formation known as a "wave cloud", accompanied by iridescence along the edges. This unique sight was spotted over the Sweetwater Mountains in the eastern Sierra Nevada Mountain Range, California, US.
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Undulatus that shows signs of lenticularis, spotted by Jeremy's daughter-in-law over West Sussex, England
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Lenticularis over Mahajeran, Northwest Iran
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Sunset over Littleton, Colorado, US
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Altocumulus, which in this case, reminded Lisa of a description that these were "buttermilk" clouds, because after a taste of buttermilk, the drippings down the cup looked like these clouds. This variation was spotted over San Igancio, Baja Sur, Mexico.
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An early morning view over Cirencester, England
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A colourful sky spotted over Keawakapu, Maui, Hawaii, US
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Altocumulus radiatus spotted over Kamloops, British Columbia, Canada
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A view of undulatus towards the west of Wellingborough, England
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