to the fact that a shot on ENIWETOK Atoll added another 180 miles cloud travel time between Cround Zero and the native atolls east of BIKINI. second, the western limits of the favorable fall-out sector could be extended to the point of accepting winds from at least east northeast, and with reservations, from northeast. This was due to the absence of any land masses to the immediate west of ENIWETOK except UJELANG approccimately 120 nautical miles southwest. The primary additional advantage of ENIWETOK therefore was favorability for "deep trades, i.e. easteriies throughout most levels, including the mid-levels, a situation not at all wiccemon during the operation. (6) Other considerations: The net result of the above was the relatively firm requirement for the mid-level winds to have directional components such that resyltant winds to the levels involved could lay within the acceptable fall-cut sectors, 1.6. within the sectors west northwest clociorise to east northeast for BIKINI shots and from about south= west cloclrise to east northeastfor EVINETOK shots, Although it would appear that the ideal shot atoll would be INIWETOK, having a auch wider “tlw acceptable faltegut séelsr, certain other factors entered into the decision, which, in fact, mate this atoll less favorable. The primary factor was a consideration yield. th the basis of MIXE results, it was considered hasardous to acewpt the relatively high probability of fallout, as well as blast effects, on the highly developed and populated camp sites at ENIWETUK. Although evacuation wotlld have resolved the fall-out probles, the problem of attempting serial operations from a base likely to require evacuation for beth fall-out dnd blast, was just one of the major problems raised. 64