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Low lying stratus approaching San Francisco Airport, California, US
A 'dragon ship' spotted over Antelope Valley, California, US
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Altocumulus lenticularis over Winthrop, Washington, 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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Homogenitus via a prior contrail, which Robin described as 'strange and beautiful', spotted over Montclair, New Jersey, US
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Cirrus over North Devon, England
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Virga at sunset over Sacramento, California, US
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A delicately painted sky at sunrise over Antelope Valley, California, US
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A mature cumulonimbus incus over Moss Vale, New South Wales, Australia
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A primary and secondary bow spotted near Sumirago, Varese, Italy
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Reflections of cumulus over Camber Sands, Rye, England
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Asperitas spotted over Denver, Colorado, US
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Subtle crepuscular rays over Esfahan, Iran
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A portion of a 22-degree halo is visible in this photograph, amidst the cirrostratus over Healdsburg, California, US
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Cumulus with the backdrop of a blue sky over Estrella Foothills, Arizona, US
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Stratocumulus perlucidus spotted over Collioure, France
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