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A colorful sunset overlooking the Ninepipes National Wildlife Refuge near Ronan, Montana
Asperitas with signs of lacunosus, spotted over Cheshire, England
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Virga, wich are trails of precipitation that fall from the underside of a cloud, but evaporate or sublime before it reaches the ground, spotted here from altocumulus clouds over Ottawa, Ontario, Canada.
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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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Mamma over Yarra Glen, Australia
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A series of contrails heading towards the horizon, spotted over New York City, New York, US
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A dynamic view of Mt. Fuji at sunset, a dormant volcano, wherein the manifestation of a lee wave brought about what appears to be a variation of, and/or the remnants of, a lenticular cloud formation. This is a result of stable air flowing over a mountain barrier, generating wave updrafts and turbulence on the lee side. This photograph was taken by Akira Ebisawa, from the lake shore of Lake Yamanaka, Japan.
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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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Stratocumulus near Luzhou, New Taipei City, Taiwan
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A frosty morning near Crank, Merseyside, England
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Pileus over Kleine-Brogel, Belgium
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Crepuscular rays amidst the cumulus congestus clouds near Hayward, California, US
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Portals to blue skies over northwest Iran
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A colorful view overlooking the Monts d'Auvergne, France
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