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The Knorr passes five miles east of afternoon cumulonimbus clouds. The giant, mushroom-shaped clouds produce showers when warm air from the ocean surface rise, condense, and fall as rain. The upper white part consist of ice crystals; the lower dark part is rain. “It’s great to look at. I’m just glad we didn’t have to go through it,” said cloud enthusiast and chemical oceanographer Bob Collier.

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