HEADQUARTERS JOINT TASK FORCE SEVEN APO 437 San Francisco, California 21 May 1956 BIKINI OBSERVED WEATHER FOR 21 MAY 1956 CHEROKEE. DETONATION TILE O551iu Sea Level Pressure 1007.6 mb Dew Point 73°F Temperature 81Fr Relative Humidity 16% Surface Wind U,0°, 10 kts Visibility CLOUDS: More than 10 miles 2/10 cumlus, bases 1800 ft, tops 2500 ft; 2/10 cirrus at 36,000 ft. WEATHER: Very widely scattered showers. There were three showers in the — vicinity of the atoll at shot time: one very light shower just to the sath of TARE; one light shower, which was dissipating, near BRAVO; and a light shower east of NAN, STATS OF SEA: Bikini Lagoon: Average of hishest 1/3 of waves; 3.0 ft. at anchorage, 2.5 ft. near Nama. The predominant direction of waves at anchorage was 135°; near Namu, 100°, Open Sea: Average of highest 1/3 of waves; 4.0 ft. The predominant direction of waves in open sea was 100°, Pressure iillibars 1009 1000 916 850 835 823 772 716 710 700 500 453 Height Feet Sfe 320 4,930 10,230 19,080 Temperature °¢ Dew Point °¢ 2702 26.5 18.5 15.5 15.2 13.5 10.5 06,2 07.2 07.2 -07.& 22,2 22.5 17.5 10.8 09.5 13.5 10,2 02,2 03.5 03.5 -10,2 -10. 2 -1lh, . 5