2. Winds with pronounced southerly components at all levels between 10,000 and 50,000 feet occur simultaneously about once every fourteen times that winds with southerly components occur at 50,000 feet. Winds with southerly com- ponents at all levels can be expected to occur about twice per month, 3. EVENTS / pad 2 of CASTLE occurred on the best possible days during March though a more favorable day for . EVENT would have been 27 February. the most favorable of the entire month. SHo72 day was 7#F SH7 vice was detonated on the next possible day, ¥Y anc IS e- While SHOTS. devices were detonated on the next occur~ rences of acceptable wind conditions, the conditions were not as markedly acceptable as on former test days. The winds were definitely more favorable at Bikini than at Eniwetok. S407°G device was detonated on the very next favorable day. (Attachment No. 2), For additional information concerning CASTLE meteorology, refer to JTF SEVEN Special Report, The Effects of CASTLE Detonations Upon the Weather, published in October, 1954, and History of the Task Force Weather Central, dated May, 1954. 176