radar-equipped search aircraft. 3vailable, Second, since initia] BRAVO ddta were the method used to determine the air radex volume, cnanged for high-yield bursts. area, was The new method considered the itial ra- jiation source as an area rather than a point. On the morning of 26 March, a favorable forecast of H-hour the following day set in motion once again the entire preshot events. Winds for hedule of This forecast gave east-northeast winds to approximataly 8,000 Feet (2.4 km), southerlies to about 12,000 feet (3.7 km), southpasterlies so 20,000 feet (6.1 km), southerlies to southwesterlies to about 55,000 ceet (16.8 km), and east-southeasterlies to easterlies above 59,000 feet (16.8 km). All units and external agencies were notified accormiingly that the ROMEO schedule was firm for 27 March at 0630. ~ Following the noon command briefings, CINCPAC was advised the fore- cast 72-hour air particle trajectories for 10,000, 30,000, 40,000, and 50,000 feet (3.05, 9.15, 12.19, and 15.25 km). The advisory st&ted that no significant fallout was forecast for populated Marshall atolf—s and rec- ommended no closure of air routes. It also stated that no fal were forecast outside Area Green and that an intensive search conducted in this area, plus a 240-nmi (445-km) wide sector outg (1,110 km), centered on a true bearing of 340°. (The sector s to 600 nmi rch was + dpane scheduled and run again postshot centered on 305° true from 200 nmi [370 km] to 600 nmi [1,110 km] from ground zero. Starting at H-2, ffpur search aircraft were used on parallel flight tracks, with 60 nmi [111 age per aircraft, in advance of the cloud.) . In addition, CINCPAC was re- quested to divert all shipping from the sector covering 260 90° true out to 450 nmi (833 km) km] cover- from ground zero. a statement that no known shipping was in this area. ° clpBckwise to The request§ included Table 28 Known transient shipping near the Pacific Proving Ground (PPG) Bhows the pn shot day. At approximately 1500 the surface and air radex areas were fnnounced as follows: 251