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Other Clouds
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Optical Effects
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Undulatus over Alamos, Mexico
Fallstreak Hole (Cavum) in the shape of a heart and with a view of the blue sky, spotted following a week of rain in Waikiki, Honolulu, Hawaii, US
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A storm with mammatus (mamma) spotted over Estrella, Arizona, US
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An 'X' created by contrails over Falls Church, Virginia, US
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Altocumulus undulatus spotted over Hamakua Coast, Hawaii, US
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Altocumulus lenticularis spotted above a layer of stratocumulus, shortly before a storm over Canutillo, Texas, US
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Sunset following a storm over Canberra, Australia
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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.
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Partial clearing following a morning storm near Falls Church, Virginia, US
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A blanket of Altocumulus, along with a view of the Sun, spotted over Dernancourt, Adelaide, South Australia, Australia
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Signs of larger shaped lacunosus spotted over Gibsons, British Columbia, Canada
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Mammatus (Mamma) spotted during sunset over Lombard, Illinois, US
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Altocumulus lenticularis, which is more often observed near mountainous regions, can have a distinct UFO-shape to it, as spotted here along with iridescence, by Alexia's friend, Ted, over Lexington, Virginia, US
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A colourful sky over Quincy, Washington, US
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Signs of supercilium development spotted over Buckley, Flintshire, North Wales
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Stratocumulus spotted over Esfahan, Iran
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