HEADQUARTERS JOINT TASK FORCE SEVEN. APO 437 San Francisco, California NAVAJO 13 July 1956 BIKINI OBSERVED WEATHER FOR 11 JULY 1956 AT DETONATION TIME 0556M Sea Level Pressure 1010.2 mbs Free Air Surface Temperature Wet Bulb Temperature Dew Point Temperature Relative Humidity Surface Wind 81.29 76,2 74..0°F 80.0% 90° ~ 8 knots Visibility 10 miles CLOUDS : 2/10 cumilus, bases estimated at 1800 feat 6/10 cumlus, bases estimated at 2000 feet 7/10 cirrostratus, bases estimated at 30,000 feet (transparent) AREA WEATHER SUMMARY FROM AIRCRAFT: . O600M - (Aircraft at 45,000 feet) Scattered to broken cloud layer based at 30,000 feet, tops at 35,000 feet. scattered) with tops to 35,000 feet. Bikini Atoll. Few cumlus (widely Could not see surface or , 0615M = (Aircraft at 44,000 feet just above broken to overcast cirrus cloud layer to the west of Bikini) Scattered cirrus clouds 50 miles south of Bikini. Few scattered cirrus to north and east of Bikini with approximately 2/10 small cumilus at low levels. Few cumulus tops to 25,000 feet. STATE OF SEA: Ocean Side: Wave height 5 ft., period 5 seconds, direction 080 degrees. Sea water temperature - 83.0%, Lagoon Side: Wave height less than 1 foot.