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Optical Effects
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A lenticular cloud at sunset over southern Alberta, Canada. The clouds often accompany strong "chinook" winds on the lea side of the Canadian Rockies. These dry, warm 'snow-eater' winds can abruptly melt as much as a foot of snow in one day, rapidly raising temperatures as much as 40°C (75°F).
Altocumulus lenticularis over Khomeyni Shahr, Iran
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Contrail above the lower cumulus fractus, spotted over New Taipei City, Taiwan
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Altocumulus lenticularis with crepuscular rays and shadows at sunset over Brighton, Colorado, US
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Sunset over Denver, Colorado, US
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Contrail over South Brent, United Kingdom
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Stratocumulus undulatus over Arlington, Virginia, US
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Altocumulus undulatus with signs of virga, spotted near Anaheim, California, US
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Circumhorizon Arc along with virga in the distance, spotted while driving on I-90 in Montana, US
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Storm system with heavy precipitation over Mercogliano, Italy
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Walking on a sunny November day, Joan and friends spotted this angel, complete with a halo, over Point Nepean National Park, Portsea, Victoria, Australia
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Cumulus fractus near Esfahan, Iran
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A contrail that appears to be coming out of the building's chimney, spotted over Twillingate, Newfoundland, Canada
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Altocumulus over Marion, United States
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A colorful mosaic over Lake Stevens, Washington, US
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Cumulus fractus ovre Hualien County, Taiwan
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