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Optical Effects
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During sunrise there appears to be a small horseshoe vortex in the sky, along with signs of undulatus, near the Estrella Foothills, Arizona, US
A mirror reflection of stratus near Bygland, Norway
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Asperitas over Saulieu, France
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Remnants of a contrail on a blue sky day over Huntington, Indiana, US
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Cirrus over Seh Chahoun, Behabad City, Yazd Province, Iran
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Cirrus over Woodvale, Australia
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A storm over the Atlantic Ocean as viewed from Boca Raton, Florida, US
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Fog amidst the trees near Mendip Hills, Somerset, England
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Altocumulus lenticularis duplicatus spotted over Santa Fe, New Mexico, US
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Precipitation in the distance, coupled with a view of clouds at different altitudes, spotted over Antelope Valley, California, US
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Altocumulus undulatus over Khomeynishahr City, Esfahan, Iran
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Shelf Cloud over Parque Meia Lua, Brazil
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Horseshoe vortex over a lake near Mt. Fuji, Japan
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A colorful mosaic over San Bernardino County, California, US
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Mamma (Mammatus) associated with a storm over Panania, New South Wales, Australia
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A classic example of altocumulus lenticularis duplicatus, spotted over Picinisco, Lazio, Italy
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