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A walk along the beach at sunrise, near Boca Raton, Florida, US
Signs of a corona and undulatus in this view from the Austrian Alps, on a day that Tobias said brought strong North Föhn winds, which is a warm, dry and gusty downslope wind when the air moves from north to south. This high altitude perspective was spotted over St. Anton am Arlberg, Austria.
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Altocumulus undulatus spotted over New Taipei City, Taiwan
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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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A layer of Stratocumulus over Wiborg Beach, East Hampton, Long Island, New York, US
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Altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted over Penobscot Bay, Maine, US
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Altostratus over Saeeda Al-Sawaleha, Saudi Arabia
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Altocumulus undulatus spotted over South Brunswick, New Jersey, US
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A solitary Altocumulus lenticularis spotted over Funchal, Madeira, Portugal
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Altocumululs stratiformis undulatus reflected on the cars during sunset over Marinoa City, Fukuoka City, Japan
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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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Sunset over Erm, The Netherlands
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Altocumulus with some signs of undulatus, spotted above a layer of stratus over Salisbury, England
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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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Altocumulus reflected in the golden light of sunset, spotted over Brighton, Colorado, US
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