hot area was the sector from surface to 60,000 fe (18.30 km) and the cool area was that area enclos bearing lines from winds at 60,000 to 90,000 feet (18.30 to 27.40 km). The long-range (24-hour) fa by out Plot was drawn to show its location relative ton ive atolls and populations and was presented in conjunk tion with the surface radex area. Seventy-two-hour airborne particle trajectory forefast. The airborne particle trajectory forecast (construfted enka tt terete by Weather Central) was used to evaluate contaminak ion on air routes and to extend the surface radex area beyond H+6. Air radex area. The air radex area normally did n affect the shot decision, and it was not directly sed at briefings unless requested. (This radex area w plotted and kept displayed at the Radsafe Office.) Radiation hazard outlooks. The following specific potential hazards were evaluated at each briefing: ~- Bikini and Enewetak. The outlook was determined from the forecast hodograph for the shot atoll. -- Ujelang. Both the long-range fallout plot and atoll hodographs were used to evaluate the outl for Ujelang. ~~ Native atolls in the southeast quadrant. Both fallout plot and shot atoll hodographs were use evaluate the outlook for native atolls in the s east quadrant. ~- Aircraft control destroyer. The shot atoll hod ~~ Fleet tugs (ATFs) and YAGs. This was presented graph was used to recommend safe positioning of rhe control destroyer for at least 6 hours and retir 5 ment in the most favorable direction in the even fallout was experienced. indicate the major activity (drone liberty ships Project 6.4) taking place within or near the surf face radex area, and within close range of the armed device prior to H-hour. ~- Air routes through Wake and Kwajalein. The impa on the air routes was determined by the 72-hour airborne particle trajectory forecast. The traj tories at 10,000, 20,000, and 30,000 feet (about c- 3, 6, and 9 km) were considered to have the major in- pact on these routes between H-hour and H+24. 119