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Lacunosus, a relatively rare and short-lived cloud formation, takes on the look of a honeycomb pattern of round holes with frayed edges. It is formed when a layer of rising warm air and a layer of cold air come into contact with one another, causing downdrafts that push through the cloud. This classic example was spotted by Alexia's friend, Bob Hunter, near Lexington, Virginia, US.
A unique juxtaposition of lacunosus with a vivid display of the Northern Lights (Aurora Borealis), spotted over Southern Alberta, Canada
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Lacunosus, a short-lived formation, spotted over Island Beach State Park, New Jersey, US
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A well-defined arcus marks the leading edge of this storm system, which is accompanied by asperitas and signs of lacunosus, near Fort Wayne, Indiana, US
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Lacunosus, a short-lived cloud formation, was spotted over North Devon, England
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Lacunosus clouds, the honeycombs of the sky, spotted over Oakland, California, US
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An expansive display of lacunosus within cirrocumulus clouds spotted over Kamloops, British Columbia, Canada
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A classic example of lacunosus spotted over Barrea, Italy
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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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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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