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Horseshoe Vortex spotted over Chester County, Pennsylvania, US
Fluctus (Kelvin-Helmholtz) spotted near the Golden Gate Bridge in San Francisco, California, US
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Asperitas and lacunosus spotted over Pittsburgh, Pennsylvania, US
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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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A classic example of asperitas, which can be likened to a more extreme form of undulatus. Asperitas differs from undulatus by the fact that its waves are more chaotic and disorderly, lacking any of the regularity and organisation typical of undulatus. This asperitas formation was spotted over Amesbury, Massachusetts, US.
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Asperitas over Ottawa, Ontario, Canada
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Asperitas with some subtle lacunosus over Gatineau, Quebec, Canada
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Mamma (Mammatus) over the Big Bend Region of Southwest Texas, US
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Aurora Borealis (Northern Lights) over Kabelvag, Norway
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Rainbow reflected in the water over Goose Bay, Labrador, Canada
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Asperitas over North Norfolk, England
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Cumulonimbus incus formation over Oro Valley, Arizona, US
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Rainbow over Holland, Michigan, US
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Cloud caps known as pileus forming over the tops of Cumulus congestus clouds and spotted over Little Switzerland, North Carolina, US.
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Cumulonimbus capillatus storm cloud over Cornville, Arizona, US. This is the appearance of a storm cloud at its most mature stage of development.
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