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Following a storm, mid-to-upper level winds brought about undulatus above El Dorado Hills, California, US
Sunset with an expansive display of undulatus over Brighton, Colorado, US
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Altocumulus undulatus spotted during the early morning along the Hamakua Coast, Big Island, Hawaii, US
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Altocumulus undulatus spotted from the Noko Ferry Terminal, Fukuoka City, Japan
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Fluctus (Kelvin-Helmholtz) and its surf-like waves spotted on a windy morning over Cornwall, England
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Altocumulus lenticularis duplicatus, also known as "pile d'assiettes", a term used for a series of lenticular clouds, stacked one above the other, caused by wave motion in multiple humid layers of air, as seen here over the Sandia Mountains, Albuquerque, New Mexico, US
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A vivid corona is spotted when the sun shines through a thin cloud and a bluish-white disc of light with a ruddy outer edge is on display, often surrounded by rings of iridescent colours. This classic example was seen by Cassie Eismann near Fort Scott, Kansas, US.
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Asperitas over Carlyss, Louisiana, US
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Altocumulus undulatus over London, England
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Altocumulus undulatus radiatus over Nokonoshima Island, Fukuoka City, Japan
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Altocumulus undulatus over Fleet, Hampshire, England
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Cavum (Fallstreak Hole) spotted over Lynchburg, Virginia, US
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Altocumulus lenticularis undulatus over Northwest Iran
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Asperitas over Winnipeg, Manitoba, Canada
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On a windy and exhilarating hike, Heather witnessed the development of this cap cloud, which forms as a stable airstream rises to pass over a peak, cooling as it does so. It is a particular variation of a lenticularis cloud, in which the cloud lies over the mountaintop, rather than downwind from it. This classic example was spotted from the Mount Fremont lookout at Mt. Rainier National Park, Seattle, Washington, US.
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An expansive display of altocumulus stratiformis undulatus over Portimao, Algarve, Portugal
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