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Mammatus (Mamma) spotted following thunderstorms near Lewisham, London, England
Mammatus (Mamma) spotted over Girona, Catalonia, Spain
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Cirrus uncinus spotted over Wyoming, US
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Crepuscular rays emanating from behind Cumulus clouds, spotted over Viella, Catalonia, Spain
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Mammatus (Mamma) associated with a thunderstorm near Springfield, Illinois, US
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A brilliant display of Altocumulus lenticularis duplicatus, also known as 'pile d'assiettes', spotted downwind of Mt Hood, Oregon, from White Salmon, Washington, US
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A classic example of Mammatus (Mamma) spotted near Waterford, Wisconsin, US
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22-degree halo over San Carlos Bay, Sonora, Mexico
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A classic example of a 22-degree halo spotted over Lerwick, Shetland, Scotland
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An exquisite sunset with Altocumulus lenticularis over Nubeena, Tasmania, Australia
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Asperitas spotted over Vancouver Harbour, British Columbia, Canada
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Altocumulus stratiformis spotted by Catherine's friend, near Vega Alta, Puerto Rico
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Cirrus uncinus over Wallberg mountain, near Rottach-Egern, at the border of Lake Tegernsee, Upper Bavaria, Germany
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A beautiful display of Altocumulus lenticularis duplicatus, also known as 'pile d'assiettes', spotted over the Velebit Mountain Range, Croatia
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Mammatus (Mamma) spotted following a thunderstorm near the Spain Pyrenees, Tavertet, Spain
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Altocumulus lenticularis duplicatus, also known as 'pile d'assiettes', spotted over Derry, Northern Ireland
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