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A lenticular cloud at sunset over southern Alberta, Canada. The clouds often accompany strong "chinook" winds on the lea side of the Canadian Rockies. These dry, warm 'snow-eater' winds can abruptly melt as much as a foot of snow in one day, rapidly raising temperatures as much as 40°C (75°F).
Altocumulus undulatus spotted by Haruko's friend, Janet, over Vinalhaven Island, off the coast of Maine, US
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As these clouds drifted towards John, they looked like thistle down erupting from the top of the large Norway Maple tree, spotted over Sagaponack, New York, US
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As a notable cumulonimbus approached from the west, Mary-Grace remarked 'the face of the storm' for that is what it looked like as it moved inland, near North Devon, England
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Altocumulus floccus spotted over Sydney, Australia
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A blanket of stratocumulus over Puget Sound, Washington, US
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Which vertebrae are represented in this contrail, Gary wondered, when he spotted it over Zion, Illinois, US
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A textured sunset over Somerset, England
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Altocumulus over Saint-Nazaire, France
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Contrails and cumulus sharing the sky over Walnut Creek, California, US
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Altocumulus at sunset over River Exe, Exeter, Devon, England
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Signs of homogenitus via contrails over Taylor, Texas, US
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A storm system near Port Bourgenay, La Vendée, France
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Signs of mammatus (mamma) spotted at dawn over Reigate, England
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Crepuscular rays over Khomeynishahr City, Esfahan, Iran
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A trifecta of contrails spotted over Modbury Heights, Adelaide, South Australia, Australia
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