- Veszes0ET7 LSS PEECO PEECO LLU Nu, . : F-17S T-S35 3 P-024| FEB OS ‘94 1345 AOCS OS oes i. March 1954 METOrANDUx FOR RSCORD: SUBJECT: Command Briefing, 0000, 1 Mareh 1954 Lanbers present: Gen. P.W. Clarkson, Gen. BE. MeGiniey, wen. He Estes, Dr. 4-C. Graves, Dr. W. Ogle, ar. J. Reeves, i>. De. Sewell , Capt. Wel. Enickerodocker, Col. W.S. Cowart, Capt. 2. a. Maynerd, Lt col c.D. Bonnot, Lt Col R.g. House.. . . 1. In generel, the forecast presensed at the midnizht briefing was confirmed, except thst in the levels besween § ead 15 thousend Teet the forecast was lisht and variable. In an attercpt to deliseate direction to these winds, it was determined that the bast forecest that could be given was for the 10 thousand foot level. This was foreceést to be westerly et 10 knots as tne most pessiasmistic situation. Consequently, the bocosrearh plot vas made usins the 10 thousand foot westerly wind im arder to present the most pessimistic situation which © would occur. This picture save reguitantwinds in the directian of Ronselspendrons -however, it was cansidered thet the @istence to Ronselap and Rengerik corpered to thse resultant Wind speeds were suco that no fell-ocut should reach those atolis. From ths forecast hodogreph the time of travel to Rongelap would neve need aebout 12 to 15 hours. The hodograph plot did however stow that certcinly TARP site would de heavily contarinated, end most likely Nsw. areas. The hodogreph gave two genéral fellecut ‘The lower level running from 260 degrees around through south to 90 degreas with a six hour fall-out line in the directica cf the populeted atolls in the southeast quadrent about 15 to 20 giles out fram ground zero. The high level redex ran fron ebout 45 degrees to 80 degrees with a six hour fali-out line to 7C miles. (Since -tha 6 hour fall-out lines were computed on abcut 10G micron particle size, it vas recomasnded that the distance ba doubled for sefety. This atounted to considering particle sizes dovn to about 70 microns). Ze Wg change in the 72 hour cloud trejectories. 3e padsere Qutlooks were sodified es follows: @. Zikini atoll wes changed feverableunfavcrabie. be Eniwetok etoll remained vary faverebls. c. Ujelens etoll reneinec very favorable. 2004641 15