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Optical Effects
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A developing storm system spotted over Central Federal District, Russia
Mid-morning iridescence over Lebec, California, 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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Iridescence spotted over Podłęże, Poland
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Virga spotted over San Francisco, California, US
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Primary and secondary bows spotted over the Ferry Building, Auckland, New Zealand
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A picturesque rainbow spotted over the Estrella Foothills, Arizona, US
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A plethora of contrails near Washington National Airport, spotted from Falls Church, Virginia, US
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A fogbow, which is formed in fog or mist near the ground and often called a 'white rainbow' or 'mistbow'. This classic example was spotted over San Miguel Island, California, US.
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Altocumulus lenticularis spotted on the western edge of Los Alamos, New Mexico, US
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During the months of November - February, the East Bay of San Francisco can experience what is known as Tule Fog, which is a dense, thick radiation fog that originates in the Central Valley of California, and blows over the hills in the East Bay, from east to west. Tule fog is a regional type of valley fog, spotted here near Oakland, California, US.
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Fluctus (Kelvin-Helmholtz) spotted over Mannheim, Germany
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A lunar halo spotted over Poelkapelle, Belgium
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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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