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Optical Effects
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An elongated fallstreak hole (cavum) spotted over Montauriol, France
Altocumulus perlucidus spotted over Puget Sound, near Seattle, Washington, US
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A contrail shadow upon altocumulus clouds, spotted over Thedinghausen, near Bremen, Germany
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Altocumulus perlucidus spotted over Conwy, North Wales
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Iridescence spotted over the Mystic River, Medford, Massachusetts, US
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Altocumulus perlucidus above a layer of stratocumulus, spotted over Taoyuan, Taiwan
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Altocumulus perlucidus over Esfahan, Iran
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Altocumulus perlucidus spotted over San Francisco, California, US
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Altocumulus floccus perlucidus spotted over Pengpeng Beach, near Baisha Township, Penghu County, Taiwan
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Full moon illuminating altocumulus a couple of hours after sunset, spotted over Madison, Wisconsin, US
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Fallstreak Hole (Cavum) spotted over Anduze, France
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Altocumulus stratiformis perlucidus spotted over Seattle, Washington, US
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As these clouds drifted towards John, they looked like thistle down erupting from the top of the large Norway Maple tree, spotted over Sagaponack, New York, US
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Altocumulus perlucidus spotted over Angle Lake near Seattle, Washington, US
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Fallstreak Hole (Cavum) spotted over Sydney, Australia
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Altocumulus perlucidus spotted during an invigorating morning run, near New Taipei City, Taiwan
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