that the continued employment of these standards and instruncnts can casily produce conditions of panic under practical operations, especially with inadequately trained monitors, Descriptions of radiological safety operations are found in Appendix "P", 23, WEATHER Special weather facilities for Operation GREENHOUSE consisted of a weather central on ENIWSTOK ISLAND, four (4) outlying island weather stations (an average of 750 miles from ENIWSTOK), and an Air Force weather reconnaissance squadron based on KWAJALEIN ISLAND. In addition, the Navy P2V antisubmarine squadron furnished weather information at each position report. Wind direction and velocity, cloudiness, and rain had a direct effect on radiological safety, drone operations and certain experimental programs, On each shot the stress on these clements varicd considerably. For example, rain could not be tolerated on "EASY" shot because of its attenuating effect on blast. Radiological safety, involving mainly the upper wind structure, was of prime importance on "GEORGE" shot because of the very large expected yield, lower tower and unstabilized surface, area. During the operation, two typhoons affected the The first one, Typhoon "GEORGIA", moved just south of BNIWETOK ISLAND shortly before the first shot. Heavy rain fell for several days while this typhoon was in the vicinity, but winds did not exoced 45 knots at the surface on ENIWETOK ISLAND. "DOG" operation was delayed one day due to interference in preparing instrumentation, The weather on "DOG" day was clear until about 10 minutes before the detonation when’ a thin, Low cloud layer moved in and persisted for about two hours, This interfered ‘somewhat with low level photography and with visual observation, but otherwise did not hamper the experimental program. on inhabited islands. The winds aloft produced seme light fall-out On "EASY" shot the weather was favorable in all respects, ale though special measures were taken to observe chance showers approaching the shot island. On "GEORGE" shot the weather was dominated by a typhoon (JOAN) to the north- west producing exceptionally favorable winds from the fall-out standpoint, but mar ginal from a drone operatiorial standpoint. Heavy rain and high humidity on the two days preceding the detonation, however, interfered considerably with instrumontation, both on the ground and in aircraft. Directions of take off and landing were 180° from normal and Low cloud and shower activity during take off resulted in a roduetion of the air effort. BL? airplane, Showery weather at KWAJALEIN prevented the take off of the blast On "ITEM" shot, the wcather was favorable although the upper wind re— sulted in very light fall-out at the southern end of UNIWETOK ATOLL. Fora more de- tailed discussion of meteorological aspects of the operation, see Appendix "Qu .'7 Lie alaie Extges AGP... i349