15 July 1954 MEMOLNDUM POL SECOD SUBJECT: 1. Radsafe Briefing and iadsafe CFFICE Display Charts adscfe Briofing Charts: Briefing ant display charts wore of such sis@ ca to be amenable to easy~handling, cml large enough for legi- bility in an crdinary sise roan. marking with grease pencil, Charts were covered with acctate for a. Hodograph and SurfaceDEX (See appendix & for miniature rencrduction): Four or five cf such charts were preparod (Cesoniing upon the complexity of the patterns, area cf coverage, and time -ver which the changes in vbserved winds were necessary). Forecasts winds were slutted separate from observed, . notobook of miniaturus of these hodccr-phs was prevared for retention by the task force scumandor and as nerminent reccrds, b. jdm Partdcle Trajectory Forecast Chart (USF Weather Plotting 6. Longerange Fall-out “orecast Chart (Shoet #8 of «MS 1201): Chart Pacific Ielanis, aWS WPC S<4<2): This chart was prepared by the Weather Central on a special weather station map drawn on a scale <f approximately 72 nautical miles.to the inch. The chart was used at the bricfing primarily for Nadsafe purpcses, following which it was sosted in the Jadsafe OFFICE for further use in oreparing necessary Acvisories. This chart, which indicatos all native islands and atolls Likely to be involved in the longerange fall-cut, was used to vresent the 2u-hour fallout plot. Native populaticns were indicated for each inhabited atoll. « mindature of this forecast was oreparvc fcr the commander and for per manent record, d. Danger ares and Search .rea Chart (Shoet #@ of .J8 1201): Because of the close intererelation between the fall-out slot ami thcse subjects, relative information was plitted on the same chart a8 the lungrange fall-out plot. e. Transient Shipzing Chart (Navy HO Chart VSe2): This chert, wnich cowerg the entire Pacific ares, was used not only to aresent the transient shipping etatus, but also to maintain contimuity in ship aovenents from one shot to ancther. f, Native Pozulation Chart (See “cpencix 3 for miniature): Mindature copies of this chart wers cade available to tha comman..r ond staff and used with the larzo iisplays (para le end ¢ above). Inclosure 8