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Summary: Instructional film showing the advantages and disadvantages of cloud cover in providing security for bombers against enemy defences, placing great emphasis on knowledge of meteorology and cloud flying techniques in making the fullest use of cloud when evading the enemy. The Cloud Atlas: various kinds of cloud. (cirrus, altostratus, cumulus) are shown, plus diagrams demonstrate the various fronts. Other topics covered include route forecasts, methods of formation flying in the best conditions with the value of flying close to the cloud (and methods of breaking formation), problems of ice on the aircraft and discussions of which clouds to be avoided.