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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).
Kelvin-Helmholtz (Fluctus), a first for Jiaren in terms of capturing it in a photograph, while on a trip to Wulanhada Volcano Geopark, Inner Mongolia, China
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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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Signs of virga over Avondale, Arizona, US
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Asperitas with lacunosus spotted by Jeffrey while re-deploying a gas analyzer on the MOFLUX tower that measures the breathing of the forest, near Baskett Forest, Boone County, Missouri, US
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Cacti reaching for the clouds over Tucson, Arizona, US
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As the cloud moved into the perfect position over the sun, Helen captured this fire breathing dragon near the North York Moors, England
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A storm system near Savannah, Georgia, US
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Undulatus upon which Kit included the following sentiment: Oh, striated sentinels of the upper air, You gather in ranks like a silent parade, You do not hurry — the earth will turn for you; You simply drift, and the world tilts its head to watch. This example of undulatus was spotted over Oahu, Hawaii, US.
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Crepuscular rays and shadows over Seoul, South Korea
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A developing storm in the distance, spotted near Lynwood, Washington, US
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Sunrise over Twin Lakes Nature Area, Columbia, Missouri, US
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An approaching storm near Miramar Beach, Florida, US
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Altocumulus lenticularis over Longyearbyen, Svalbard, Norway
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Bursts of cirrus spotted over Pewsey, Wiltshire, England
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Altocumulus stratiformis undulatus spotted at night over Llanelli, Wales
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