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Dramatic colours in the sky over Constantia, Cape Town, South Africa
Signs of a horseshoe vortex spotted over Garrabost, Isle of Lewis, Scotland
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A layer of stratus as viewed from the Alkai swamp trail on the Napali Coast, Kauai, Hawaii, US
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Layers of clouds over Twisp, Washington, US
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Sunrise over the mountains and valley fog, near Vermontville, Adirondacks, New York, US
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A unique variation of cumulus congestus, influenced in its shape by upper air winds, spotted over Alesund, Norway
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Virga at sunset over Winthrop, Washington, US
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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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