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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).
Altostratus over Wittmann, United States
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Cirrus uncinus on grand display near San Luis Obispo, California, US
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A storm system that approached fast, per John's report, and provided a lot of rain over a 30-minute time period, near Redcliffe, Queensland, Australia
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Altocumulus lenticularis near Bermeo, Bizkaia, Spain
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Nacreous over Mesnali, Norway
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Sun Dogs, also known as a Parhelion, on a cold day near Brighton, Colorado, US
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Cirrocumulus over Jilin Province, China
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Fallstreak hole, also known as a cavum, spotted shortly after sunrise near Plaquemine, Louisiana, US
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Layers of stratus near La Plagne Montalbert, France
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Rainbow over Woodvale, Australia
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Cumulus and cumulus fractus populate the sky over Northwest Iran
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Sunset captured by Jean's friend, Mattie Hunter, looking west from an elevation of 2,000 feet in the Appalachian Mountains in northeast Georgia, US
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A stretch of cumulus clouds that may be developing into a storm, spotted by Chandrani's friend, Frano Mika, during the morning hours over Rijeka, Croatia
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An expansive display of altocumulus in advance of a winter storm, spotted near Walburg, Texas, US
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Cirrocumulus stratiformis over Khomeynishahr, Esfahan, Iran
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