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Optical Effects
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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.
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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Fallstreak Hole (Cavum) spotted over Conwy, North Wales
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Altocumulus stratiformis spotted at sunrise over Marinoa City, Fukuoka City, Japan
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A stunning display of Altocumulus stratiformis undulatus spotted at sunset over Bend, Oregon, US
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Altocumulus stratiformis with cumulus fractus passing underneath, spotted over Zhongzheng District, Taipei City, Taiwan
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