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Optical Effects
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Fallstreak Hole (Cavum) with falling ice crystals, spotted near Elsenham, London Stansted Airport, England
A unique view of two Fallstreak Holes (Cavum), along with the sun located 'in' the smaller one, spotted over Harkness State Park Beach, Waterford, Connecticut, US
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A unique juxtaposition of Altocumulus lenticularis and Fluctus (Kelvin-Helmholtz) spotted on the lee side of the Rocky Mountains in Berthoud, Colorado, US
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Fallstreak Hole (Cavum) spotted over Sedro Woolley, Washington, US
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Fallstreak Hole (Cavum) spotted near the time of sunset, over Athens, Georgia, US
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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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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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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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Virga spotted over San Francisco, California, US
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Altocumulus lenticularis spotted on the western edge of Los Alamos, New Mexico, US
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Altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted by Rachel's husband over Scunthorpe, Lincolnshire, England
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Altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted in a raspberry colour over Medford, Massachusetts, US
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Circumzenithal Arc spotted over Amenia, New York, US
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Altocumulus perlucidus spotted over Taiwan
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Altocumulus lenticularis duplicatus, also known as 'pile d'assiettes', spotted over Croatia
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Altocumulus lenticularis duplicatus, also known as 'pile d'assiettes', spotted over Mount Shasta, California, US
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