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Altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted over Burton on Trent, England
A layer of altocumulus above what appears to be low-lying stratus clouds formed via homogenitus, as a result of the nearby power plant and a variety of particles that act as condensation nuclei. This view overlooking Uskmouth Power Station, South Wales, is from Portishead, Somerset, England.
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Autumn view of Altocumulus stratiformis, spotted from Pinnacles Youth Park, Boone County, Missouri, US
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A mesmerizing view of altocumulus stratiformis undulatus, also known as a 'mackerel sky', spotted over Rossford, Ohio, US
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Altocumulus stratiformis undulatus, also known as a mackerel sky, which reminded Roger Graham Hewstone of the sailor's old proverb; 'mares tails and mackerel scales make lofty ships take down their sails, wary of bad weather ahead'. This example was spotted looking west from Ormskirk, Lancashire, England.
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Iridescence upon altocumulus clouds over Cherry Hill, New Jersey, US
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Altocumulus spotted over Zhongli, Taoyuan, Taiwan
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A line of altocumulus stratiformis spotted over Estrella Foothills, Arizona, US
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Altocumulus spotted over Tucheng District, New Taipei City, Taiwan
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Sunrise over Mahajeran, Western Iran
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A variety of altocumulus spotted at sunset, near the Hamakua Coast of Hawaii, US
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A corona spotted over Toledo, Ohio, US
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Altocumulus stratiformis radiatus spotted over Beechhurst, Queens, New York, US
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A view of Altocumulus stratiformis undulatus, also known as a 'mackerel sky', from above Onondaga County, New York, US
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Altocumulus stratiformis radiatus spotted over Littleton, Colorado, US
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A plethora of Altocumulus stratiformis spotted over Hood River, Oregon, US
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