Y dit Se lia rocheae eeete te There will be an extensive sheet of altostratus and altocumulus which o will make aircraft operations above 20,000 feet difficult and occasionally hazardous, March and April. This situation is more particularly true in late Agein, as during the normal trade flow which is found during this time of the year, the easterly winds will vary in direction with height, becoming very strong westerlies above 30,000 feet and reaching as high as 100 knots at 45,000 feet on occasion, These winds are associated with a weather system aloft which can become quite in- + danbihl Sataa)e tense and which can persist for periods in excess of a week, This situation is the one to be the most wary of during this period of operations. 3. In sumary, normal trade flow weather is to be expected during the greater part of the period of CASTLE operation, Day to day fluc- tuations from the normal will be those elements of digression which +e Cr pA” - oo on de tin Ric edeibeate Nader caps RillnaeeBs will have to be forecast,