the shot island, and GEORGE was detonated under perfect conditions of wind and weather, e. ITEM SHOT: (1) Normal weather requirements wore cstablished for ITEM Shot since the yield was not expected to be excessive and because no special instrumentation problems were anticipated. (2). At informal weather bricfings preceding ITEM Day, normal trado ~ Wind weather was forecast. | Atthe first formal briefing at H minus 30 hours, continued trade wind weather was forecast with the upper wind pattern tconding to become less favorable. (4) At the H minus 18 hours briefing, the weather outlook continued favorable but the upper wind pattern was forecast to be only conditionally favorable for H hour, It was recommended thet H hour be moved up as much as possible, and the Commander decided to detonate the weapon at one half hour before sunrise, At the H minus 6 hours briefing, the previous forecast was confirmed and plans for detonation at one-half hour before sunrise continucd. © (6) Woather conditions at H hour were extremely favorable with no rain, and yory little cloudiness. Light fall-out occurred over the southern part of the ENIWETOK ATOLL because of tho upper wind structure, The decision to advance H hour was undoubtedly vory fortunate 325 a later H hour would have produced considerably more fall-out over inhabited islands.