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Main Cloud Types
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Other Clouds
- Arcus
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- 'Supercilium' (not official classification)
- Translucidus
- Tuba / Twister
- Uncinus
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- Velum
- Vertebratus
- Virga
- Volutus (Roll cloud)
Optical Effects
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- Wegener arc
Cavum (Fallstreak Hole), which is formed when part of the cloud layer forms ice crystals which are large enough to descend as a "fallstreak". They form in clouds of supercooled water droplets, which in the end, creates a form of virga, a trail of ice crystals that doesn’t reach the ground, but evaporates before getting that far. This classic example was spotted over Charlotte, Michigan, US.
Altocumulus over Lianfan, China
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A roll cloud, which is a form of an arcus cloud, spotted near the North West Shelf off of Western Australia
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A unique perspective of a 22-degree halo, with a bee-fly visiting a poppy in the foreground, near Selma, Oregon, US
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Undulatus with indications of altocumulus lenticularis spotted near Zermatt, Switzerland
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Fluctus (Kelvin-Helmholtz) spotted over Baltimore, Maryland, US
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Stratocumulus and altocumulus over Charlotte, Michigan, US
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Glory over Albano, United States
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Crepuscular rays and shadows at sunset near Charlo, Montana, US
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Crepuscular rays emanating like spotlights from the horizon during sunrise over Busquistar, Andalusia, Spain
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Altocumulus lenticularis duplicatus, which is also known via the French term, 'pile d'assiettes', for a 'stack of plates'. This classic example was spotted over Lake Peak in the Sangre de Cristo Mountains, near Santa Fe, New Mexico, US.
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Asperitas over Kester, United States
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Nacreous clouds are often lenticular wave clouds which are found downwind of mountain ranges that induce gravity waves in the stratosphere. These nacreous clouds were spotted by Gary's friend, Sierra Salin, in the early morning hours over Mt. Tamalpais, Marin County, California, US.
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An ephemeral glimpse of supercilium, an unofficial classification for a short-lived cloud formation that resembles eyebrow-like features, spotted over the mountains on a cold and windy day in Montevergine, Mercogliano, Italy
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Stratocumulus with color from the sun, spotted over Jiangxi Province, China
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As Robyn was driving, she spotted a cloud face that also spotted her, over the Estrella Foothills, Arizona, US
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