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Asperitas and lacunosus spotted over Pittsburgh, Pennsylvania, US
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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Vivid display of asperitas and lacunosus as a storm approached Ottawa, Canada
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Asperitas with some subtle lacunosus over Gatineau, Quebec, Canada
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Lacunosus, a short-lived cloud formation, shown here in different stages of evolution within high Altocumulus clouds over Brentwood, Missouri, US
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Lacunosus, which is characterized by a lattice of holes, spotted over Cornwall, England
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A sunrise over Reading, England.
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A sunset over Chinnor, Oxfordshire, England.
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Lacunosus over Chesham , Buckinghamshire, England.
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Lacunosus over London, England.
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Lacunosus over Brentwood, Missouri, US.
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Lacunosus over Kapunda, just north of Adelaide, Australia.
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Lacunosus over Manchester, Connecticut, US.
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Lacunosus over New Delhi, India.
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Lacunosus over Indiana, US.
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Lacunosus over Suffolk, England.
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