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A formation over Phoenix, Arizona, US, that mike commented on as displaying Holmboe Instability, with a pileus effect also being displayed.
Stormy skies over Blairgowrie, Perthshire, Scotland
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Iridescence through a canopy of Altocumulus clouds over Lac La Hache, British Columbia, Canada
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A developing thunderstorm, as reported by Paula, over the Isle of Wight, England
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Cumulus over Hutchinson Heights, United States
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Mamma (Mammatus) over Oklahoma City, Oklahoma, US
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A family of cumulus clouds below a sky of contrails, over Henley on Thames, England.
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Altocumulus stratiformis amidst a sunrise over Clermont-Ferrand, France
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Orographic Stratus, formed as moist air cools as it rises up the cliffside, beneath Altocumulus stratiformis spotted over Isla de los Estados, Tierra del Fuego, Argentina.
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Altocumulus stratiformis undulatus spotted over Taylor, Texas, US.
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Cumulus towers dissipating at the end of day with Altocumulus and Altostratus above and beyond.
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Lenticularis over Lochbuie, United States
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Strong high altitude shearing winds contributing to the development of Cirrus uncinus cloud formations over Cashmere, Washington, US.
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Corona over San Antonio Del Mar, Mexico
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Mixed layers over Fort Saint James, British Columbia, Canada
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An evolving sky over Malakwa, British Columbia, Canada.
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