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Optical Effects
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Asperitas spotted over Denver, Colorado, US
A storm system with signs of lacunosus over Denver, Colorado, US
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A storm system over London, England
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A clashing of the clouds, or as Andrea notes, a "cloud-head" blowing the other clouds across the sky, as seen over Freiburg, Germany
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A turbulent storm system spotted by Frano Mika near Rijeka, Croatia
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A view at sunset, following the passage of a storm near Curtin, Canberra, Australia
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A dissipating storm system at sunset over Esmeralda County, Nevada, US
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A mature cumulonimbus spotted over the Sawatch Range, near Buena Vista, Colorado, US
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An approaching storm over the Forest of Dean, Yorkley, England
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Storm development with various shades of grey, accompanied by signs of mammatus (mamma), spotted over Arnhem, Netherlands
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Crepuscular rays making their way through storm clouds during sunset over Sumirago, Varese, Italy
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A developing thunderstorm at sunset, upon which Edward saw a frightening monster standing, with eyes and a nose, powerful arms and fists, and a belt, spotted over Vermontville, Adirondacks, New York, US
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A robust cumulonimbus visually highlighted by the contrast of colour in the sky, spotted over the Picentini Mountains, Italy
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A developing storm over Eastern Shore of Chesapeake Bay, Maryland, US
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A storm system over Crank, St Helens, Merseyside, England
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Upon the return from a 10-day trek to Annapurna Base Camp, Malcolm and his friend, Nory, captured this view of storm clouds that held off until later that evening, along with crepuscular rays and signs of a horseshoe vortex, spotted over Phewa Lake near Pokhara, Nepal.
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