This series of cirrus clouds are known as “roll clouds” because they are sculpted into tight rolls by air currents from the jet stream over Saudi Arabia and the Red Sea. The crest-to-crest spacing of the cloud bands can be used to calculate the velocity of the jet stream. (This is a close, almost vertical shot of the cloud band in slide #2.)

STS 41-C, April 1984. Picture #13-32-1159.

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