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Optical Effects
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Virga at sunset over Winthrop, Washington, US
Layers of clouds over Pocheon, Gyeonggi Province, South Korea
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Layers of clouds over Curtin, Canberra, Australia
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A family of geese paddle their way across the calm water during sunrise over Sooke Basin, Sooke, Vancouver Island, British Columbia, Canada
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Subtle signs of asperitas and lacunosus spotted over Isle of Lewis, Scotland
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Low lying stratus approaching San Francisco Airport, California, US
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What looks to be a 'new mountain range' appears to actually be a layer of stratus that is exhibiting Holmboe instability. This is an instability related to Kelvin-Helmholtz instability, and it manifests as bumps in the clouds rather than clouds that curl over. This unique example was spotted by Peggy while out on Lake Superior, near Cornucopia, Wisconsin, US.
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A classic example of pileus spotted over Curitiba, Brazil
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Fog which covered the hillside in the morning had started floating upward, looking like soft cotton candy, spotted over Santa Rosa, California, US
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Altostratus at sunrise over Madison, Wisconsin, US
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Virga at sunset over California, US
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A layer of thick stratus near Emeryville, California, US
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Valley fog as viewed from 5,500 feet above sea level, at Excelsior Peak, Washington, US
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Virga at sunset over California, US
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Fluctus (Kelvin-Helmholtz) resembling the waves below, spotted near Tofino, British Columbia, Canada
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Signs of mammatus (mamma) at sunset near Hexham, Northumberland, England
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