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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.
Mosaic of colors illuminated by some Iridescence, prior to an incoming storm over Vermontville, New York, US.
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Birds on a wire beneath some Cumulus fractus, spotted over LaVale, Maryland, US.
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Altocumulus lenticularis amidst a colorful sunset over Monte Rosa in Sumirago, Italy.
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Altocumulus lenticularis spotted over Villeneuve-lez-Avignon, France
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Rainbow over Grasse, France
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Corona over Eugene, Oregon, US
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Cirrocumulus overlooking Cumulus fractus above Eugene, Oregon, US
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Crosswire view of altocumulus clouds with some virga over Carlsbad, New Mexico, US.
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Altocumulus over Beaufort, South Carolina, US
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Cloud caps known as pileus forming over the tops of Cumulus congestus clouds and spotted over Little Switzerland, North Carolina, US.
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Asperitas clouds spotted over Seattle, Washington, US.
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A mixed sky, from low to high, of Stratocumulus, Altocumulus and Cirrus spotted over Papamoa, New Zealand.
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Cirrus over San Luis Rey, United States
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Formation of cirrus fibratus, thanks in part, to the remnants of earlier contrails over Williston, Vermont, US.
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Cumulus congestus illuminated over Fukuoka, Japan
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