However, the air particle trajectories for eact shot indicate a sinilority in that, regardlesa of the initial (ireetioas of the winds, the mii~level winds normally shifted to westerlies 2% varying distances from grows sero, The not consuquence of this action was the: eventual transport of the most aignificant layers of contamination to the east.. Upon subsidence cf the 43bris into the tradewind flow, contamination was brought back into the gceneo.% area of the tests and the northern Marshalls, The emount of fall—cut a.iiving at populated stolls depentod upon the proximity of the air pirticle tar jectories to a west—east line thr-ugh ground sero. intensity 2f fall-out was low. Except for BR.VO, the The fact remains, Rowover, that the continual deposition of small amounts of long-lived fiseion products builds up 2 backe ground which ameeivably could result in prohibitive levels causing cossation of tosting, or permanent removal of native inhabitants. (10) | Due to mtual intorests and over-lapping responsibilities, the close working relation batween tho Weather Officer and the Radsafe Officor of the task force was a majcr factor in the mecessful presentaticn of sound interlocking data for operational decisions. To assist thie relation and ingofar as the possible, the physical locations of the ~eather and the Radsafe Secticns were adjacent. b. Weather (1) ‘The weather, primarily the mid-level (20,000 to 60,000 feet) wind patterns largely tectermines the schedule of cetonations. (2) Realistic fallen’ predietione .or high yield weapons re~ quired reliable wind forecaste for tHe first 24. Bours following the ietcna~ tion in omtorto be assured that signifleant fcll-cut coal occur within aceertable tine aad area limitations. 69