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Optical Effects
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Stratocumulus lenticularis, a less common formation of lenticular clouds, which develop at a lower level of the atmosphere, spotted over Bairnsdale, Victoria, Australia
Altocumulus lenticularis stacked one above the other, caused by wave motion in multiple humid layers of air, also known as "pile d'assiettes", spotted near the Cholla Cactus Garden, Joshua National Park, California, US
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Altocumulus stratiformis undulatus, also known as a "mackerel sky", spotted over Proserpine, Queensland, Australia
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A vivid display of mammatus (mamma) over College Station, Texas, US
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Undulatus spotted during the early morning over Devanahalli, Bangalore, India
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Altocumulus lenticularis spotted over Krzeszowice, Poland
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Undulatus spotted over Northern California, US
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Altocumulus undulatus over the Outback near Coober Pedy, Australia
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Altocumulus undulatus with a lone cumulus fractus drifting by underneath, spotted over Marinatown, Fukuoka City, Japan
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Sunset over Brisbane, Australia
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A plethora of cirrus cloud formations spotted over Lake Stevens, Washington, US
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A unique variation of undulatus, with a resemblance to a large flame, spotted over Mercogliano, Italy
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A reflection of the sky over the Tonlegee Reservoir, Swords, County Dublin, Ireland
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Cirrostratus undulatus spotted over the valley near the Fraser River, Fort Langley, British Columbia, Canada
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An incoming storm system with crepuscular rays and shadows along the horizon, near North Dundas Township, Ontario, Canada
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A classic example of asperitas spotted during the early morning over Tours, France
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