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Signs of Supercilium cloud formations spotted over Santa Cruz, California, US
Supercilium, an unofficial cloud classification for features that are short-lived, often referred to as 'eyebrow clouds', spotted over Rio del Mar Beach, Aptos, California, US
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An expansive display of Cirrus uncinus over Prevost Harbor, Stuart Island, San Juan Islands, Washington, US
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A vivid display of Noctilucent observed from an airplane over Iceland
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Fluctus (Kelvin-Helmholtz) that looks like an octopus tentacle, spotted over Brighton, Colorado, US
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Stratus fractus drifting over Conwy, North Wales
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Altocumulus stratiformis undulatus, spotted in the late afternoon over Vermontville, Adirondacks, New York, US
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Monsoonal conditions above a passing freight train in this 30-second exposure photograph captured near Kingman, Arizona, US
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Contrails at dusk near the seaside of Zhejiang, China
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Cumulus congestus spotted near Trentishoe, Exmoor, England
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Cumulus fractus spotted over Mazandaran Province, Iran
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Altocumulus lenticularis spotted over Southsea Beach, Portsmouth, England
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Altocumulus over Markazi Province, Iran
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Altocumulus stratiformis spotted over Sacramento, California, US
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A mixed sky over Dalton Highway, near Coldfoot, Alaska, US
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Altocumulus spotted over Golden Hill, San Diego, California, US
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