JOINT TASK FORCE SEVEN San 4 ’ , 12 June 1956 "BLACKFOOT ENIVETOK OSSERVED WEATHER FOR D JUNE 1956 | AT DETONATION TIME 0626M Sea Level Pressure Free Air Surface Temperature . Wet Bulb Temperature’ Dew Point Temperature Relative Humidity Surface Wind Visibility . . - . 1012.5 mb 81.19 97 ,2°F 7589 8h..0% 075° 10-14 knot's ‘ 10 miles CLOUDS: 2/10 cumulus; estimated at 1500 ft. ' Large cumulus with shower activity located 74 miles bearing 060° from Eniwetok. measured by radar at 37,000 ft. 1/10 stratocumlus; base estimated at 4500 ft. 2/10 or more. altocumlus; estimated at 9000 ft. Top of this cumulus ’ (opaqu 8/10 cirrostratus; estimated at 30,000 ft. (thin) tiie. transparent) REA WEATHER SUMUARY FROM AIRCRAFT REPORTS: _ 3/8-5/8 cumlus over Eniwetok area with bases at 1500 feet and tops generally at 5000-7000 feet. Cumulonimbus located south of GZ with top at 35,000 feet. Some cumlonimbus tops estimated at 45,000 feet to north— east and north of GZ (no distance estimated), A scattered: line of cumlo— nimbus about 30 miles east of GZ with tops estimated at 40, 000 feet. “8/10 altostratus; bases at 13,, 500 ft with tops at 15, 000 feet. - 8/10-9/10 cirrostratus (very thin); based at 30,000 feet which appeared to be “breaking up" and dissipating. Rain showers were observed to the east and west of GZ, no distances estimated, STATE OF SEA: ote Ocean Side: Wave heights 5 feet, period 6 seconds, direction 090°. Lagoon Side: Wave heights less than 1 foot, ENTTOK UFPER AIR SOUNDING (1117152) Pressure (W4illibars) 1004 1000 850 718 Height (Feet) - 364 5,016 8, 530 Temperature (°C) Dew Point (°c) %B.h 23.7 17.7 13.3 26,3 11.0 23.6 O5.4°