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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.
Signs of larger shaped lacunosus spotted over Gibsons, British Columbia, Canada
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Cirrocumulus with some limited signs of lacunosus, spotted over Taiwan
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An intricate web of undulatus, accompanied by signs of lacunosus, spotted over Lake Stevens, Washington, US
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Remnants of what appears to be a form of lacunosus, spotted over Highlands, North Carolina, US
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A unique juxtaposition of lacunosus with a vivid display of the Northern Lights (Aurora Borealis), spotted over Southern Alberta, Canada
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Cirrocumulus with signs of lacunosus spotted over Bethany, Oklahoma City, Oklahoma, US
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Signs of lacunosus spotted over Twisp, Washington, US
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Signs of lacunosus that reminded Sabine of SpongeBob SquarePants, spotted over Arnhem, The Netherlands
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Asperitas and lacunosus spotted following a morning thunderstorm over El Paso, Texas, US
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Altocumulus with signs of larger scale lacunosus, spotted over Lancaster, Pennsylvania, US
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Lacunosus spotted over Hennef, Germany
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Altocumulus with subtle signs of lacunosus, spotted at sunset near Murrieta, California, US
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Signs of lacunosus at night, spotted over West Jordan, Utah, US
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Lacunosus, a short-lived formation, spotted over Island Beach State Park, New Jersey, US
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Signs of lacunosus on the underside of the leading edge of a cumulonimbus, spotted over Erm, The Netherlands
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