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Optical Effects
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Cumulus congestus, potentially developing into a cumulonimbus, captured by Nicola's son, Sam, near Adelaide, South Australia
These lens-shaped orographic wave clouds, known as altocumulus lenticularis, form when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere. If there is enough moisture in the air, the rising motion of the wave will cause water vapour to condense, forming the unique appearance of lenticular clouds. This classic example was spotted near Narbonne, France.
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A classic example of Cumulus congestus over Georgetown, Texas, US
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Cumulus congestus over Goodyear, Arizona, US
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Pileus over Waukesha County, Wisconsin, US
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Cumulus congestus over Beijing, China
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Cumulus congestus over Seoul, South Korea
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Pyrocumulus (Flammagenitus) as a result of a wildfire near Helena, Montana, US
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Pileus accompanying a Cumulus congestus cloud formation above Charlotte, North Carolina, US
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Cumulus congestus spotted over Esfarayen, Khorasan, Iran
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Crepuscular rays emanating from behind a cumulus cloud over the Indian Ocean island nation of Mauritius in East Africa.
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Cumulus congestus with velum veils over Perth, Western Australia
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A developing storm system over Perth, Western Australia
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Cloud caps known as pileus forming over the tops of Cumulus congestus clouds and spotted over Little Switzerland, North Carolina, US.
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Crepuscular Rays over Toyohama, Fukuoka City, Japan.
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Building storm systems over Cheshire, England.
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