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Optical Effects
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Altocumulus undulatus radiatus over Brisbane, Australia
Undulatus over Hyderabad, India
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Crepuscular rays and shadows during sunset over Brown County, Minnesota, US
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A mixed sky over North Dundas Township, Ontario, Canada
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A diamond shape in the sky, spotted over Sittingbourne, Kent, England
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Sunrise over the mountains and valley fog, near Vermontville, Adirondacks, New York, US
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Undulatus on full display, spotted by Peter's sister, Martha Yaney, over Darien, Connecticut, US
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Undulatus upon which Kit included the following sentiment: Oh, striated sentinels of the upper air, You gather in ranks like a silent parade, You do not hurry — the earth will turn for you; You simply drift, and the world tilts its head to watch. This example of undulatus was spotted over Oahu, Hawaii, US.
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Altocumulus stratiformis undulatus spotted at night over Llanelli, Wales
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Stratocumulus undulatus at sunset over Hadfield, Derbyshire, England
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Layers of altocumulus lenticularis, also known as 'pile d'assiettes', with signs of asperitas closer to the horizon, amidst the display of undulatus over Singleton, New South Wales, Australia
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Altocumulus undulatus radiatus over Sarina, Queensland, Australia
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Altocumulus undulatus radiatus spotted by Lucien's friend, Matt Bennett, over Gold Coast, Australia
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Altocumulus undulatus radiatus spotted over West End, Brisbane, Australia
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Altocumulus undulatus radiatus spotted over Taringa, Queensland, Australia
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A stunning winter sunset over Nulkaba, Hunter Valley, New South Wales, Australia
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