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Optical Effects
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Altocumulus lenticularis spotted over Black Butte, Oregon, US
Horseshoe vortex spotted over Leuven, Belgium
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Altocumulus lenticularis during the late afternoon over Merano, Italy
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An exquisite view of cumulus with the backdrop of a blue sky, spotted over Momochi Seaside Park, Fukuoka City, Japan
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Sunset with an expansive display of undulatus over Brighton, Colorado, US
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A vivid corona over Brighton, Colorado, US
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Altocumulus lenticularis duplicatus spotted near Capdenac, Lot, France
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Cirrus uncinus on grand display near San Luis Obispo, California, US
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Circumzenithal Arc spotted by Moriah's 11-year-od brother, Anthony, who captured this image near Antelope Valley, California, US
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Multiple displays of altocumulus lenticularis, including an example of lenticularis duplicatus, which is also known via the French term, 'pile d'assiettes', for a 'stack of plates'. These classic examples of lenticularis were spotted near Antelope Valley, California, US.
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A curved contrail over Ningbo, China
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Noctilucent clouds near Kemerovo, Russia
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A sky decorated with contrails (homogenitus), which form when it’s cold enough and moist enough at high altitudes, and the water vapour contained in the plane’s hot exhaust gases mixes with the very cold air to condense and form ice crystals, which took place here multiple times over Charente, France
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An aircraft condensation trail with the 'zipper' appearance that can sometimes be produced by the effect of turbulence around the aircraft wings.
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A Kelvin-Helmholtz formation over Big Bend, Texas, US.
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An example of Crow Instability over Bigfork, Montana, US.
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