This characteris- tic trajectory, it is believed, is a further cause of the low level of activity deposited on the Hawaiian Islands. The first material from MIKE detected in the Hawaiian Islands was collected five to six days after burst and was evident on both gummed paper andhr filter samples. Tne maximm air filter activity (1) d/m/m’) was collected seven to eight days after MIKE, the maximum gummed paper activity (6500 d/m) was coliected eleven to fall but with -KING cloud on 20 burst. Activity to twelve days after burst. Debris continued © diminished intensity until the arrival of: the to 21 November, again five to six days after on the first gummed paper sample was about the Same as the maximum (slightly over 5000 d/m) that occurred three days later while the maximumair filter sample (10 d/m/m’) was not collected until the tenth to eleventh day after KING. The highest air concentration of 1k a/m/m? is small compared ‘to the 570.d/m/m? found at Cincinnati, Ohio, two days after a Buster-Jangle test, but it should be noted that no value as high as 1 d/m/m was ever observed in the United States as long as seven days following an atomic test. 5.3.1 Potential Maximum in the Hawaiian Islands It is easy to find weather patterns which would result in passage of an atomic cloud over the Hawaiian Islands socner after burst than did the MIKe or KING clouds; the GREENHDUSE DOG . and the SANDSTONS YOKE were samples of such rapid movement. It is also possible for the clouds to pass more directly over the Islands than did the IVY clouds. It is difficult, however, to assign an upper bound to the activity which might be deposited because there is no data which can be used as a basis of reference. The situation potentially most dangerous is one in which shower clouds build up to great heights and penetrate the - upper tropospheric westerlies at the time a fast-moving cloud of | debris passes overnead, Conditions favorable to this situation are present in both winter and summer, although the summer frequency is low. ‘During the months of November through March systems of disturbed weather with tall shower clouds, pass the. Islands on the average of about twice a month - these are the "Xona Storms” that bring one to three days of rain. They represent a situation potentially dangerous from the radiological point of view because they combine clouds of great vertical extent with very fast winds in the upper troposphere. = 35 ee ~ 1) Lo , aban, passed well to the south of the Hawaiian Islands.