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Signs of lacunosus over Montana, US
Asperitas with signs of lacunosus spotted by Alwin's mother near Hohnstein, Saxony, Germany
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Asperitas with signs of lacunosus spotted near Cotia, Sao Paulo, Brazil
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Altocumulus with a variety of formations, including lacunosus, spotted during sunset over Baltimore, Maryland, US
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A mixture of altocumulus and cirrocumulus spotted over blades of grass near Hohnstein, Saxony, Germany
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Lacunosus amidst a collection of contrails over Glouster County, New Jersey, US
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Asperitas and lacunosus spotted over Pittsburgh, Pennsylvania, US
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Asperitas with signs of lacunosus over Royton, Oldham, England
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Asperitas with signs of lacunosus, spotted over Cheshire, England
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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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Stratocumulus with signs of lacunosus, spotted near Bath, England
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Lacunosus over Ningbo, China
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An intermittent display of altocumulus and stratocumulus over the Boundary Waters, Minnesota, US
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Lacunosus over Battery Point, Australia
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Lacunosus is in view for anyone walking in the crosswalk and looking up, as spotted over Petaluma, California, US
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Lacunosus and undulatus are both present in this mixed sky over New Taipei City, Taiwan
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