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Optical Effects
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A blanket of altocumulus with cumulus fractus below, spotted over Boca Raton, Florida, US
Undulatus spotted over Fowlmere, Cambridgeshire, England
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Altocumulus stratiformis undulatus spotted over Google, East Riding of Yorkshire, England
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22-degree halo with signs of a 46-degree halo, spotted over Chikkajala, Bangalore, India
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A blanket of altocumulus spotted from the Great Wall of China, near the Changping District, Beijing, China
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A sky filled with patterns and colours over Mengelrode, Germany
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Altocumulus stratiformis perlucidus spotted over Seattle, Washington, US
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Altocumulus stratiformis undulatus, also known as a mackerel sky, was captured by Carl McGarrigle, who also remarked 'I forgot to iron the sky this morning'. This classic example was spotted over Preston, Lancashire, England.
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Altocumulus stratiformis undulatus, also known as a mackerel sky, spotted over Boca Raton, Florida, US
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Fallstreak Hole (Cavum) spotted over Sydney, Australia
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Altocumulus stratiformis spotted at sunset over Devanahalli, Bangalore, India
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A mixed sky over Fixin, Burgundy, France
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Altocumulus over Devanahalli, Bangalore, India
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A plethora of cirrocumulus spotted over Chicago, Illinois, US
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A colourful display of undulatus over Oulton Broad, Suffolk, England
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Altocumulus over Seoul, South Korea
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