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Cirrostratus undulatus spotted over Pic de Montaut in the French Pyrénées, near Sarrancolin, France
Asperitas with signs of lacunosus spotted over Sacramento, California, US
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Cirrocumulus undulatus with signs of lacunosus, spotted over Lake Stevens, Washington, US
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Altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted over Penobscot Bay, Maine, US
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A spectacular example of a multi-layered Altocumulus lenticularis duplicatus, also known as 'pile d'assiettes', spotted by Keith Johnson while salmon fishing in the Andes, Argentina
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Supercilium are short-lived cloud formations that resemble eyebrow-like features and appear in turbulent airflow over, and to the immediate lee of, steep mountain peaks, as spotted here over Santa Barbara, California, US
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Asperitas spotted over New Bern, North Carolina, US
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Asperitas and lacunosus spotted in tandem over WInnipeg, Manitoba, Canada
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Altocumulus stratiformis undulatus spotted over Cape St Vincent, Algarve, Portugal
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Iridescence spotted over Arlington, Virginia, US
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Asperitas spotted over East Texas Regional Airport, Longview, Texas, US
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A vivid corona spotted over the National Cathedral, Washington D.C., US
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Altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted over Archer, Florida, US
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A dynamic, sideways-appearing Altocumulus lenticularis spotted over Fagurholsmyri, Iceland
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Multiple examples of Altocumulus lenticularis spotted near Portobello, Scotland
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Parhelic Circle amidst the optical phenomena spotted over New York City, New York, US
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