oo income Cloud treeking informtions for AOD was, as for ’ ve sourcese The contributias of each of the sources (listed below) will be discussed in subsequent paragraphs. Sampling aircraft reporte Sweet-Sour report Special Cloud Tracking Plights Weather Reconnaissance Flights AFOAT-1 Flights bane Gs : a i 9 s 14,000, 25,000, 55,000 and 70,000 feet om ROMEO day. The winds at the lowest levels (Surface to 6,000 feet) were from the northesst at an average speed of 10 incte and car~ ried very light particles from the base cf the stem toward the southwest. This movement wee verified by subsequent aircraft reports. The next higher levels of the stem (8,000 to 20,000) appeared to have acved to the weet-north- weet at an average speed of spprewimately 12 incts. This segnent should have pat to the north of Pniwetok. Ite early novenent te clearly peflactes cloud tracking aircraft reports. The upper oe of the sten mushroom moved cut to the north and the north-northeast (see Appendix I). It will be noted that the 55,000 and 60,000-foot levels are an exception © the northerly trend of cloud movement. These latter levels aoved out generally to the ncrth and then east. Fallout from these levels could have been carried back over Bikini and Bniwetok by subsequent "easterlies" at low levels. It is believed that this mechanism caused the fallout observed at Bikini approximately 36 hours after ROMEO and also that observed at Mmiwetok roughly 12 hours later. This fallout was of little consequence other than as a "yiuisance® factor (20-40 mr/hr at Bikini and 8-10 mr/hr at Rniwetols) Incl. 6 . 1-36