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Cirrus uncinus which Anna says resembles their alphorn, spotted over Champfer, Engadin, Switzerland
Horseshoe vortex spotted in the early evening over Hereford, Arizona, US
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Mammatus (Mamma) at sunset over Oro Valley, Arizona, US
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A classic example of pileus spotted over Curitiba, Brazil
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A large version of altocumulus lenticularis spotted over Dupuyer, Glacier County, Montana, US
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Altocumulus lenticularis over Svalbard, Norway
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Virga spotted during the early morning over Goodyear, Arizona, US
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Virga spotted over Torrejon de Ardoz, Spain
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A classic fallstreak hole (cavum) over Blyth South Beach, England
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Horseshoe vortex spotted over Leuven, Belgium
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A notable storm system in an area that Santiago described as formerly being desolate without any vegetation. Over the past few decades, Chinese forest rangers planted trees and gradually nurtured the environment back to life. Today, there are endless stretches of lush forest farms, as seen here near the Saibangba Forest Farm, Weichang County, Chengde City, Hebei Province, China.
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Crepuscular rays over Khomeynishahr City, Esfahan, Iran
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Crepuscular rays over Hamburg, Germany
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22-degre halo over Exeter, Devon, England
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Stratus hugging the mountains in the Rhone Valley near Sion, Switzerland
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A cloudbow as seen from above, by way of an airplane that took off from Curitiba, Brazil
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