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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.
Shreds of Stratus, known as Stratus fractus, on the slopes near the Blackfoot River in Montana, US.
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Rainbow over Oostelbeers, The Netherlands
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Intense rainbow action spotted over Durham, North Carolina, US, including a primary bow, a secondary bow, supernumerary bows (tiny fringes inside the primary bow) and Alexander’s Dark Band (the darker sky between the bows).
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Altocumulus illuminated by the rays of sunrise with lower Stratocumulus lenticularis formations in shadow over Whiteface Mountain, Adirondack Mountains, NY, US.
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Altocumulus lacunosus spotted in the evening over Baltimore, Maryland, US.
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Altocumulus undulatus clouds spotted over Baltimore, Maryland, US.
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Moonlit Stratocumulus undulatus clouds spotted over Brisbane Water, Woy Woy, NSW, Australia.
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Fair-weather Cumulus spotted over Gross Valley in the Blue Mountains, New South Wales, Australia.
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The variety of the high cloud Cirrocumulus known as lacunosus, which is characterised by a lattice of holes.
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A UFO-shaped Altocumulus lenticularis formation, and eyebrow-like features, with the unofficial name supercilium, forming in the turbulent air in front, spotted over Palm Springs, California, US.
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Asperitas over Winsted, United States
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Altocumulus undulatus over East River, New York City, US.
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A 22-degree halo formed by Cirrostratus cloud and some cloud iridescence formed by Cumulus fractus, spotted over Zoetermeer, South Holland, Netherlands.
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Fallstreak Hole over Wittmann, United States
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A spring lamb spotted over Edinburgh, Scotland.
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