EVENT The device was a land surface shot detonated at 0620 hours local (M), 7 avril 1954 on the western tip of ENINMAN Island (TARE) ral Seated te at Bikini. The yield was approximately 110 kilotonis. A low level wave in the easterlies moved across the Marshalis on 6 and 7 April 1954. A convergence line to the east cf this wave had a great amount of weather, i.e., heavy cumulus and shower activity, associated with it. The attached series of "Sketch of Cloud Return on SPS-6 Radar" were constructed from the three hours prior to, until five minutes after, shot ee,ere | Tha en ee time, and show the distribution of the major shower clouds near ground zero (See Figures 14 through 22.) The radar scope from which these tracings were made was primarily assigned for monitoring the three B-5C test aircraft. Outiines of cloud return near or approaching greund zer> were constructed only at such times when the monitor could make the scope availiable for tracing clouds. The tracings were made rapidly and as accurately as possible with particular attention directed to those water— bearing clouds from which precipitation could be expestea ic be inaucea after the shot, An observer aboard a weather reconnaissance aircraft flying at 10.000 feet in the vicinity of Eniwetok and Bikini during the period five hours befcre shot time observed 5/8 to 8/8 cumulus with the tops generally 7,0 feet... and some higher clouds reported as altocumulus with bases estimatec from 15.000 to 22,000 feet. At approximately the same time another aire