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Optical Effects
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Mammatus (Mamma) spotted over Woden, Canberra, Australia
A layer of thick stratus near Emeryville, California, US
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Reflections of fog in Southeast Alaska, US
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A cumulus cloud that reminded Robyn of a baby elephant with its lucky trunk, spotted over Hillsborough, New Jersey, US
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A "whale" cloud borne out of a contrail, breeches above the trees, as spotted over Ravenna, Seattle, Washington, US
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An indication of a solitary cumulus fractus amidst the quiet blue sky, spotted by Cassie Eismann near Pryor, Oklahoma, US
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Cumulonimbus incus, also known as an anvil cloud, which indicates that the storm has reached a level of stratospheric stability and is considered to be in its mature stage, as seen here over Centerville, Ohio, US
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Rainbow over Schlossborn, Taunus, Germany
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Altocumulus perlucidus over San Bernardino County, California, US
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Undulatus at two different levels of the atmosphere, spotted over Selsey, England
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A developing cumulonimbus that produced severe thunderstorms further east on the Colorado plains, spotted over Brighton, Colorado, US
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Cumulus fractus creating layers of reflection by way of Round Lake, Idaho, US
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Cumulus development near Batanes, Philippines
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Crepuscular rays over Khomeynishahr City, Esfahan, Iran
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During the "blue hour" shortly after sunset over Thédirac, France
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Valley fog as viewed from 5,500 feet above sea level, at Excelsior Peak, Washington, US
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