pail 1 March 1954 LTLORANDUM FOR EECORD SUBJECT: 1. 2400K “eather 2riefing Prior to BRAVO Shot (B-044,5 hours) The following personnel were present for this briefinc: Major Gene~ } ral Clarkson, Dr. Graves, Brig. General EcGinley, Prig. General Estes, Dr. Ogle, Dr. Duane Sewell, Ur. Reeves, Capt. Knickerbocker, Col. Cowart, Capt. Maynard and It. 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 steted that at shot time there rould be 2/8 of cumilus, bases 2,000 feet, tops 5,000 feet; 2/8 of stratocumlus, bases 6,000 feet, tops 7,000 feet; 1/8 thin cirrus at “> 38,000 feet; widely scattered light showers in the area, but none over shot site at shot tice; and contrail formation level at 35,000 feet. The tropo~ pause height wes 55,000 feet; temperature -78°C. Mention was made of the 46 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. Le That there might be some locally induced weather caused by the detonetion itself was mentioned, as well as the light end variable winds at Ss loteveee 10,000 feet; that these winds would likely have a westerly component; 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. 5. ‘the terminal forecast for Kwajalein and Wake was given next, stating that Wake had been ouite poor, with low ceilings and frequent showers buat would improve for shot time and would have broken cumilus and cirrus with scattered showers in the area. For Kwajalein it was stated that there would be continous showers activity, and that they had been having broken to oocasional overcast lower clouds with occasional showers. These showers se~ dused visibility to three miles. ‘The latest winds aloft used in this vbrief= ing were the 2100! winds from the USS CURTISS (Incl b). These winds, along with the discussion of the air particle trajectories canpleted the itezs discussedin the weather briefing. 6. * 7 Lte Col. House followed this with the radsafe briefing. cided to have an additional look at the latest Annas) at OLOCL. x! [fseanek » C.D. BENT Lt. Colonel, USAF 2 Incle e a forecest Staff Teather Cffice> >. mes forecast Rol 7 * ‘ It =as ce 7