HEADQUARTERS JOINT TASK FORCE SxVil APO 437 San Francisco, Caiifornia 21 July 1956 TEWA BIKI#I OPSERVED WEATHER FOR 21 JULY 1956 AT DETONATION” TIME OSL6M Sea Level Pressure 1009.3 mbs Free Air Surface Temperature Wet 3ulb Temperature 62° F 78° F Dew Point Temperature “7° F Relative iumidity gs ¢ Sea Water Temperature Surface Wind 64° F ESE 5 knots Weather No showers reported Visibility Over 10 miles CLOUDS: 2/10 cumlus, bases at 2,000 ft. 1/10 cirrostratus, based at 30,000 ft. STATE OF SEA: Open Sea: Wave heights 3 ft., period 6 seconds, direction 090°, ARHA WEATHER SUMMARY FROM AIRCRAFT: Scattered cwmlus clouds bases at 2,000 ft. 35,000 ft., tops at 36,000 ft. 1-5/8 cirros based at BIKINI UPPER ATR SOUNDING: Pressure (illibars) 1000 850 700 645 616 596 582 500 Height Termerature 310 4950 26.5 17.8 22.5 11.5 12500 3.5 -2.5 (Feet) 10310 1377 14,600 15223 1911;0 (°c) 7.5 Dew Point (°c) 0.8 2.2 -10.5 - 6.5 -15.2 0.5 - 0.8 - 7.2 -16.5