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Optical Effects
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Cirrus fibratus spotted over Victoria, British Columbia, Canada
Undulatus spotted at sunset near Taylor, Texas, US
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Cumulus fractus over Iowa City, Iowa, US
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A colourful display of Altocumulus cloud formations, spotted over Lyle, Washington, US
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Altocumulus and Altostratus spotted over Mubwayaka Lake, Algonquin Park, Ontario, Canada
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Signs of a horseshoe vortex spotted over Melbourne, Australia
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Reflections of virga during sunset over a lake near Stockholm, Sweden
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Mammatus (Mamma) spotted over Achim, near Bremen, Germany
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A sleepy face spotted in the clouds over Goodyear, Arizona, US
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Crepuscular rays and signs of virga spotted during sunset over Liverpool Bay, near Gaw Hill, Ormskirk, England
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Pileus spotted over Bestwig, North Rhine-Westphalia, Germany
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Altostratus spotted during sunset over Lisboa, Portugal
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Cumulonimbus spotted at sunset over Osnabrück, Germany
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Primary and secondary rainbows following the passage of a storm near Brighton, Colorado, US
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A mixed sky during the evening near Greenfield, California, US
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Cirrus homogenitus, formed from the remnants of a contrail, spotted over Stockport, England
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