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Horseshoe vortex spotted over Madison, Wisconsin, US
Cirrus fibratus spotted over the Hudson River, New York, US
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A classic example of Mammatus (Mamma) spotted over Pedara, a village located on the southern slopes of Mount Etna in Sicily, Italy
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Rainbow over Bremen, Germany
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Mammatus (Mamma) spotted over St John's College, Cambridge, England
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Fallstreak Hole (Cavum), which occurs when supercooled water droplets freeze, creating ice crystals that become heavy and fall below as virga. This classic example was spotted over Maroochydore, Queensland, Australia.
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A classic example of Mammatus (Mamma) spotted over Denver, Colorado, US
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Mammatus (Mamma) over Monument, Colorado, US
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Mammatus (Mamma) spotted over Petaling Jaya, Malaysia
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Fallstreak Hole (Cavum) spotted over Florence, Massachusetts, US
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Pileus spotted shortly before afternoon thunderstorms over Lewisham, London, England
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A rainbow spotted over the Muromi River, Fukuoka City, Japan
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Asperitas spotted over Pullman, Washington, US
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An expansive display of Mammatus (Mamma) spotted over Bulga, New South Wales, Australia
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Fallstreak Hole (Cavum) within a layer of Altocumulus perlucidus translucidus, spotted over Whitstable, Kent, England
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Asperitas and signs of lacunosus spotted over Marion, Iowa, US
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