“he ChembaidiS briefing, the forecast offered a less favorable — candhtLas-inthe Lower levels (10,000 to 29,000 feet). Reoultand winds at abou’ 20,000 feedwere forecast in the direction of ROMGELAP and NONGHRIZ (see Inch 5); however, it ws considered that the speeds ant tvs altitudes did no’ warrans a conclusion that significant quantitics ani.. levele af debrie would be carried out so far. The decision to stoct me confirmed subject tc a further weather/redsafe check at O430K Bu.¥O Days | TiaB Site ws forecast to be wall in the fall~cut ares and KE Site to be in a fairly hich intensity area. Since the 5-l, day forecasts caveve winds tending from weet southwest, a decision was made ct the te search for shipping aheed of the cloud, i.e. centered mimimes redius, ..tapprocimataly H-& hours, the British Unis on KWJ/LEIN wie givon the forecast H hour GZ winds, the bunker firing party rersonnel on MiNi and in order to meintain a capability for helicopter ovacuation for this pasty. Te resultant winds pointing at ONGRUK emi NOMGELIi? wore licht and were tronsport. sicnificaent debris to these atolis.. Search results, as well as other sources of infomation, relative to transient shipring being negative, the decision to shoct was confirmed. .. post~ehot analysis of the BuO. fall-out pattern (by elliptical approximation) is included in Based on the midnicht forecast, confirmed at 0430M, the Surface and jir RiDEXES were modified as indicated in Inclosure 5, At 0645M, 1 Marek 1954, Bit.VO was detonated on the surface of « amall sand spit between sites B'KER and CH.ULIE without hasard to tesk force perscanel, The bunker firing party reported in safe, Sut by O71 the '‘ padiation levels were roportod risinz at the bunker. These levels continued ' to rise to about 25 r/hr. The firin- rerty wes considered to be in a reasonehly safe position since the personnal were able to -ot into + well _ protested areca deep in thg bunker, reading a-proximately 3§ ar/hr. me_overellclouc assumed a funnel shape with tho stem a vory anall - (approximately ton mile diameter) coluan undernecth. The juncture of the lower stom with the funnel was at about 20,000 to 25,000 fcet. . of the furmol was at about the tropopmuse. The top «cove the fumel an over=— running lip formed apparently from splash-out at, and above the tropopause. it about H 4 30 minutes visiblo particles wore observed cominz from the juncture of the stom with the uprcr funnel. Tho rein of visible particles " moved out end up the sides of the funnel until en crea was dofinod, the Ka3