RR nana ea n sittin ss anna centile scasneantoaatllnas 1 March 1954 SUBJECT: 200K “eather Driefing Prior to 2R4V0 Shot (B-O445 hours) 1. The following personnel were present for this briefinc: Major General Clarkson, Dr. Graves, Brig. General McGinley, Brig. General Estes, Dr. Ogle, Dr. Duane Sewell, lir. Reeves, Capt. Knickerbocker, Col. Cowart, Capt. Vaynard and Lt. Col. Rouse. 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 is general was holding up for shot time. 3. The attached forecast was presented (Incl a) which steted that at shot time there rould be 2/8 of cumlus, bases 2,000 feet, tops 5,000 feet; 2/8 of stratocumlus, bases 6,000 feet, tops 7,000 feet; 4/8 thin cirrus at af > 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. pause height wes 55,000 feet; temperature -75°C. The tropo- Mention was made of the 4D 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 tonztion itself was mentioned, as well as the light and variable winds at 1C,000 feet; that these winds would likely Lave a westerly cocnponent; and that the level from 7,000 feet through 14,000 feet was also very light and variable, the tendency being for a westerly compcnent at all these levels. 3 Somat aee 5 the terminal forecast for Kwajalein and Wake was given next, stating that Wake had been quite poor, with low ceilings and frequent showers but would izprove for shot time and would have broken cumulus and cirrus with scattered showers in the area. For Kwajalein it was stated that there would be continuous showers activity, and that they had been having broken to oo~ casional overcast lower clouds with occasional showers. These showers se~ dused visibility to three miles. ‘The latest winds aloft used in this brief- ing were the 2100! winds from the USS CURTISS (Incl b). These winds, along with the @seussion of the air particle trajectories completed the i: ens discussedin the weather briefing. 6. It. Col. House followedthis with the radsafe briefing. cided to have an additional look at the latest cands) at OLOCL. lener Oft C. D. BONNOT x! ¢ are ° Lt. Colonel, USAF f est . ea corecast QL 7 af? Teather Cfficer ’ It =as ce