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Optical Effects
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A storm front over Toolleen, Victoria, Australia.
Following continuous rain for a number of days, the clouds cleared and signs of an apparent circumzenithal arc appeared in the sky over Mercogliano, Italy
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Cirrus spissatus resembling feathers over Chiayi City, Taiwan
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Altocumulus lenticularis near El Paso, Texas, US
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A classic example of a 22-degree halo over Northern California, US
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Altocumulus undulatus radiatus near Qiantang District, Hangzhou City, Zhejiang Province, China
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Cirrus fibratus spreading out across a morning sky over North Devon, England
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Sunrise over Catamount Mountain, Adirondacks, Vermontville, New York, US
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Signs of fluctus (Kelvin-Helmholtz) as viewed from the Steart Marshes, looking south towards Quantock Hills, Somerset, England
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Altocumulus perlucidus over National Taipei University, Taiwan
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Multiple contrails over Almere, Netherlands
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Cumulus fractus over Esfahan, Iran
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Sunset with fragmented contrails over Monte Rosa, near Sumirago, Varese, Italy
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An expansive display of lacunosus within cirrocumulus clouds spotted over Kamloops, British Columbia, Canada
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Lacunosus, a short-lived cloud formation identified by its 'holes', spotted over Radom, Poland
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Contrails in the sky during sunset over Warblington, Hampshire, England
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