Wave cloud

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  Wave clouds east of Mt. Mitchell
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  Wave clouds over Mt. Pisgah looking SW from Federal Building
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  Elongated wave cloud
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  Wave clouds east of Mt. Mitchell
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  Wave clouds seen from my roof in Bergen, Norway
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  Wave cloud seen from the train station in Corte, Haute-Corse, France
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  Wave clouds forming over Mount Duval, NSW, Australia
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  Atmosferic effect on wave clouds of Polish Sudety