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PRI's The World: Roll Cloud (Photo: Gavin Pretor-Pinney)
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PRI's The World: Fallstreak (Photo: Vicki Harrison)
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PRI's The World: Cap (Photo: Michael Davenport)
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PRI's The World: Cirrus Radiatus (Photo: Brian Chudleigh)
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PRI's The World: KH Wave (Photo: Giselle Goloy)