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Optical Effects
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Altocumulus undulatus clouds spotted over Baltimore, Maryland, US.
Moonlit Stratocumulus undulatus clouds spotted over Brisbane Water, Woy Woy, NSW, Australia.
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The variety of the high cloud Cirrocumulus known as lacunosus, which is characterised by a lattice of holes.
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Altocumulus undulatus over East River, New York City, US.
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Three fallstreak holes, also known as cavum cloud features, spotted over North East Derbyshire, England.
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Cloud ridges known as undulatus in a mixed sky after a four-day blizzard spotted from the North Shore (Silver Bay) of Lake Superior, Minnesota, US.
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Altocumulus clouds or a phoenix flying into the sunset, depending on how you look at it, spotted over Santa Barbara, California, US.
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Undulatus over Rauschendorf, Germany
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Parallel ridges of Altocumulus cloudlets, known as undulatus, going this way and that at two different levels, known as duplicatus.
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Altocumulus cloudlets lined up into rows, known as undulatus, spotted over East Tisted, Hampshire, England.
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Altocumulus lined up in rows, a pattern known as the variety undulatus, spotted over Kauai, Hawaii, US.
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Undulatus over Maui, Hawaii, US.
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Undulatus over Port Aransas, United States
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A sunrise over Erm, Netherlands.
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A Maori canoe, rowed by a line of warriors over Lake Taupo, New Zealand.
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