data were obtained as to the simultansous occurrence of southerly winds at 50,000 feet and at levels below. The results are shown in Table 1 following: TABLE 1 ALTITUDES DIRECTIONS 120° through 240° 100° through 260° 50 to 30 thousand 3.4% (16) 10.8% (51) 50 to 20 thousand 2.1% (10) 6.0% (29) 50 to 10 thousand oh% (2) 2.3% (11) Note: Percentage frequency of winds of given directions occurring simultaneously at all levels below 50,000 feet. (474 observations during period 1 January through 14 May 1954. Cases in parenthesis). Table 2 following, shows that winds with southerly components have occurred as frequently during these months of 1954 as they did in past years, TABLE 1945, 1946,1950, 1951, and 1952 Note: 1954, 300M 32% 10,000 ft 30% 800CM 21% 25,000 fb 26% 15000M 35% 50,900 ft 40% 7 Percentage frequency of winds with southerly compo~ nents, January, February, March, April through midMay 1954, as compared to previous years. From the above tables, the following conclusions were drawn: The upper winds during CASTLE were as favorable as past years for such an operations; this was a fairly "normal" Na year. t? 1. —e@