JOINT TASK FORCE SEVEN APO 437 San Francisco, California 10 July 1956 APACHE ENIWETOK OBSERVED WEATHER FOR 9 JULY 1956 AT DETONATION TIME 0606M Sea Level Pressure Free Air Surface Temperature Wet Bulb Temperature Dew Point Temperature ", Relative Humidity Surface Wind Visibility 1010.5 mbs 80,3°F 76.1,°F Th e9OF a, 030° ~ 15 knots Over 10 miles CLOIS3: 2/10 cumulus; bases estimated 1500 f[t., tops estimated 25,000 feet tor south and west, 2/10 stratocamilus; beses at 2,000 ‘ft., tops estimated 4,000 feet. Few altoc:umlus iess chan 1/10. 4-10 ci-rostratus; estimated at 30,000 ft. (very thin and transparent). Nurer ais comrail..: at 30,000 to 35,000 feet. fXi: SATEE? SUM.-RY FROM AIRCRAFT: LOM: Scatvered cumilus buildups approximately 50 miles to east 6151: 1O miles north and west of ground zero, torzed at 20,000 to 25,000 ft. Scatteres stratocumilus tops estimated ab €,000-7.0,000 ft. Very light rain shower at Eniwetok, GZ clear, kased ct 27,000 ft., tops unknowm, Stratus overcast (625: To east and southeast of ground zero. 6/8 cumlus and stratoCumlis with tops below 15,000 ft., occasional cumulus buildup to 25,000= 20.100 £4. 27a. OF SEA: | DNA Neean Side: Wave height 4 feet, period 7 seconds, direction 070 degrees, iagoon Side: Wave height 1 foot.