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National Geographic : 1974 Oct
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SKYLAB 2 (BOTH ABOVE);SKYLAB 3 (BOTHBELOW) WITH BRUSHES both broad and fine, clouds paint the movements of invisible winds on whose backs they ride. Bold eddies drift for 150 miles in the lee of Guadalupe Island (upper left), off Mexico's Pacific coast. The 4,000-foot-high isle disrupts a wind flow from the north, creating the common phenomenon known as Karman vortices. Washboard clouds (left) lie downwind of the Kyrenia Range on the north coast of Cyprus. The ridge induces a wavelike undulation of air flowing from the Mediterranean. Clouds occur at the crests of the waves, while the troughs are clear. Fearsome-looking but almost spent, the vortex of tropical storm Glenda (top) dissipates over the Pacific a thousand miles west of Mexico. Complex pattern of crosshatched clouds em broiders westerly winds at the edge of a storm over the North Atlantic (above). The broad bands run perpendicular to the wind, while the fine billow clouds parallel it. 477
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