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Other Clouds
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Optical Effects
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- Wegener arc
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.
Altocumulus lenticularis, along with lenticularis that appear to be at the stratocumulus level in the background, spotted near Torres Del Pine, Patagonia, Chile
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A classic example of a fallstreak hole (cavum) spotted amidst an expansive display of altocumulus clouds over Lot, Occitanie, France
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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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Altocumulus lenticularis undulatus over Northwest Iran
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Lacunosus, a rare, short-lived formation, is identified in terms of the gaps between cloud elements, rather than the clouds themselves. It is when a cloud layer is composed of more or less regular holes, around which fringes of cloud form, like a net or rough honeycomb. The holes of this variety are formed by sinking pockets of air, and the cloud fringes around them by air rising up between the pockets to replace them. Such sinking can occur when a layer of cooler air finds itself over a warmer one. Being more dense, the cooler air sinks down through the warmer air. This classic example was spotted on a cold morning over Priddy, Somerset, England.
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Fluctus (Kelvin-Helmholtz), or as Ursula quipped, "Oh! Wow! It's those Meyer, er, Maier, oh, Meyerholz?, er, those wave clouds!" This classic example of fluctus was spotted over Sunnyvale, California, US.
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Multiple displays of altocumulus lenticularis, including an example of lenticularis duplicatus, which is also known via the French term, 'pile d'assiettes', for a 'stack of plates'. These classic examples of lenticularis were spotted near Antelope Valley, California, US.
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Altocumulus stratiformis, which is the most common type of altocumulus, spotted over Falls Church, Virginia, US
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A grand display of virga, following a day that Martha described as being filled with cirrus uncinus, spotted over Asheville, North Carolina, US
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Fallstreak Hole (Cavum) over Catforth, Preston, England
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Sun Dog (Parhelion) and reflections in the water near Salerno, Italy
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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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