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National Geographic : 1925 Aug
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Photograph by F. Ellerman CIRRO-CUMULUS The official definition of this form is: "Small globular masses or white flakes without shadows, or showing very slight shadows, arranged in groups and often in lines." Cirro-cumuli are nearly always frozen, as are the other members of the cirrus family. Photograph from U. S. Weather Bureau CIRRO-CUMULUS: WAVED FORM This, one of the lowest of the frozen clouds, floats from a mile to three miles higher than Pikes Peak. The beautiful waved structure is not a characteristic of cirro-cumulus alone; it is seen in practically all the thin clouds, from strato-cumulus up to cirrus. It is formed by air currents flowing past one another at different speeds, thus setting up waves. X-_h
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