1 “areh 1954 VOORANDUL. FOR BECORD SUBJECT: 2,00M “eather Briefing Prior to 2RAVO Shot (B-OS45 hours) 1. The following personnel were fresent for this briefinc: Major Gene ral Clarkson, Dr. Graves, Srig. General EcGinley, Brig. General Estes, Dr. } Ogle, Dr. Duane Sewell, ir. Reeves, Capt. Knickerbocker, Col. Cowart, Capt. Maynard and Lt. Col. House. 2. The weather briefing was opened with a general statement on the synoptic situation over the Pacific area. It was mentioned thet there was no significant’ change from the briefing this morning, and that the weather in general was holding up for shot time. 3. The attached forecast was presented (Incl a) which stated that at shot time there rould be 2/8 of cumlus, bases 2,000 feet, tops 5,000 feet; 2/8 of stratocumilus, bases 6,000 feet, tops 7,000 feet; 1/8 thin cirrus at | ey 38,000 feet; widely scattered light showers in the area, but none over shot | site at shot tice; and contrail formation level at 36,000 feet. The tropo- pause height wes 55,000 feet; temperature -76°C. LKention was made of the LD knot winds at 40,000 feet, and that the cirrus was caused by the flow around the high, located at 30 to 40 thousand feet over this area. 4e That there might be some locally induced weather caused by the de- tonation itself was mentioned, as well as the light end variable winds at 16,000 feet; that these winds would likely have a westerly camponent; and that the level from 7,000 feet through 11,000 feet was also very light and variable, the tendency being for a westerly component at all these levels. Z teh cease 5 The terminal forecast for Kwajalein and Wake was given next, stating that Wake hal been owite poor, with low ceilings end frequent showers bat would isprove for shot time and would have broken cumilus and cirrus with scattered showers in the area. For Kwajalein it was stated that there wuld be continuous showers activity, and that they had been having broken to co~ casional overcast lower clouds with occasional showers. These showers se- The latest winds aloft used in this brief~ dused visibility to three miles. ing were the 2100. winds from the USS CURTISS (Incl b). These winds, along with the @&scussion of the air particle trajectories completed the st ens discussed, the weather briefing. 6. 4 Ite Cole House followed this with the radsafe briefing. Kens) at OL0CLs. cided to have an additional look at the latest x! 2 Incls 2 > oohar ronecest QL 7 Bon Lt. Colonel, USAF c. D. Stal? Teather Cffice> It sas ce _