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Other Clouds
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Optical Effects
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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.
A range of colours and clouds spotted over Taiwan
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Altocumulus perlucidus spotted over San Francisco, California, US
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A plethora of contrails illuminated by the full moon, spotted over Covarrubias, Burgos, Spain
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Altocumulus floccus perlucidus spotted over Pengpeng Beach, near Baisha Township, Penghu County, Taiwan
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Cirrus uncinus spotted over Granite Bay, California, US
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Moon Dogs spotted over Chippenham, Wiltshire, England
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Signs of altocumulus lenticularis amidst the variety of cumulus in the sky over Belgium
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A feather-like cloud forms from the remnants of a contrail, spotted over Cirencester, England
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Full moon illuminating altocumulus a couple of hours after sunset, spotted over Madison, Wisconsin, US
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Crepuscular rays over Iligan City, Philippines
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Altocumulus lenticularis spotted over Omak, Washington, US
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Mammatus (Mamma) that preceded rainfall over Daventry, Northamptonshire, England
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Contrails in the distance over Lowestoft, England
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Swirls of clouds spotted over San Francisco Bay, California, US
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Altocumulus over Mechanicsburg, Pennsylvania, US
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