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Optical Effects
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A storm system with a developing wall cloud (murus), spotted while driving towards the coast from Granada to Motril, Andalusia, Spain
Cumulus congestus that appears to be on the verge of developing into a cumulonimbus, with a classic example of pileus over the top of its formation, spotted near Tuggeranong, Australian Capital Territory, Australia
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Altocumulus lenticularis, along with lenticularis that appear to be at the stratocumulus level in the background, spotted near Torres Del Pine, Patagonia, Chile
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Virga coming close to reaching the ground, which if it did, would be precipitation reaching the surface, stemming from a storm at sunset near Bigfork, Montana, US
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An expansive storm system with shreds of pannus, which are also known as scud clouds, forming below the cumulonimbus, as captured by Warren Keelan from the top of Mount Kiera in Wollongong, New South Wales, Australia
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Nimbostratus over Golestan County, Shiraz, Iran
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Storm system near College Station, Texas, US
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Cumulus congestus prior to a storm developing near Torrejon de Ardoz, Spain
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Shreds of pannus, also known as scud clouds, can take on different shapes and sizes, and usually exists within the saturated environment beneath a storm. This example was spotted over Cotia, São Paulo, Brazil
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Pannus, which is a type of stratus fractus, seen here in the saturated atmosphere below towering cumulus congestus, as viewed above Sagres, Algarve, Portugal
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Storm system over Puget Sound and the Olympic Mountains, as viewed to the west from Edmonds, Washington, US
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A lowering of a layer of cloud, which appears to be a variation of a Cavum (Fallstreak Hole), spotted over Fayetteville, Arkansas, US
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Mamma (Mammatus) on an afternoon wherein Sarah describes the sky as churning over the state capital of Jefferson City, Missouri, US
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Altocumulus lenticularis, which is a visually stunning cloud feature that is usually caused by a moist airstream flowing over raised ground, such as a hill or mountain peak. When the atmosphere in the area is stable, the air can develop a wave-like motion downstream, invisibly rising and dipping in the lee of the peak. If the air rises and cools enough, lenticularis clouds can appear at the crests of these waves. When the airstream contains layers of moist air separated by drier air, a stacked formation can appear, known as ‘pile d’assiettes’. This example was spotted over Fairbanks, Alaska, US.
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A reflection of a cumulonimbus near Gongju, South Chungcheong, South Korea
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Volutus (Roll Cloud) associated with a storm system that produced heavy rain, as spotted by Anuja's nephew, Akshay Shankar, over Bangalore, India
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