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Optical Effects
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Cumulonimbus illuminated by lightning and reflected in Stony Lake, Ontario, Canada
During an active thunderstorm, Kerstin's husband captured an illuminated Cumulonimbus during the frequent lightning strikes, spotted near Biesdorf, Berlin, Germany
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Signs of Cirrocumulus lacunosus spotted with a full moon over Vermontville, Adirondacks, New York, US
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Mamma (Mammatus) spotted at the edge of a storm, near Elmhurst, Illinois, US
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Noctilucent spotted shortly after Midnight over Stockholm, Sweden
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Lightning strike captured via 30-second exposure, spotted near Kingman, Arizona, US
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A vivid display of Noctilucent observed from an airplane over Iceland
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Noctilucent spotted at 2:00 AM local time near Riga, Latvia
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Noctilucent clouds are primarily composed of ice crystals at heights 50-70 miles above the earth's surface and form during the summer when temperatures in the mesosphere are coldest. Temperatures lower than about -120 degrees Celsius are required for its formation. This classic example was spotted during a flight between JFK airport in New York, US, and Heathrow airport in London, England.
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Noctilucent clouds spotted over Lincolnshire, England
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Noctilucent clouds spotted over the Keyhaven River, near Lymington, Hampshire, England
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Noctilucent clouds spotted at 0300 BST over Winchester, England
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Signs of noctilucent spotted by Paul's twin brother, Richard, near Adlington, Cheshire, England
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Cloud-to-cloud lightning spotted during a thunderstorm near Lewisham, London, England
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Noctilucent clouds spotted by Julianna Dollinger's friend, Adam Cordero, over the Atlantic Ocean, on a flight to Spain
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A thunderstorm captured at night, with lightning highlighting what appears to be an Altocumulus lenticularis in the midst of the storm system, spotted near Waterford, Wisconsin, US
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