READQUARTERS
JOINT TASK FORCE SEVEN
.
li
oo
12 June 1956
"BLACKFOOT
ENIWETOK OBSERVED WEATHER FOR 12 JUNE 1956
AT DETONATION TIME 0626M
Sea Level Pressure
Free Air Surface Temperature
.
Wet Bulb Temperature
1012.5 mb
Dew Point Temperature
Relative Humidity
Surface Wind
.
81,19
77 @2°F
75 BOF
81,.0%
075° 10-14 knots
Visibility
10 miles
CLOUDS:
2/10 cumlus; estimated at 1500 ft. Large cumulus with shower activity
located 74 miles bearing 060° from Fniwetok. Top of this cumulus
measured by radar at 37,000 ft.
,
1/10 stratocumlus; base estimated at 4500 ft.
2/10 or more altocumilus; estimated at 9000 ft. (opa
—
8/10 cirrostratus; estimated at 30,000 ft. (thin)ras transparent)
AREA WeATHER SUMMARY FROM AIRCRAFT REPORTS:
_ 3/8-5/8 cumilus 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 northeast 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,
DNA
STATE OF SEA:
Ocean Side:
oo
Wave heights 5 feet, period 6 seconds, direction 090°.
Lagoon Side: Wave heights less than 1 foot.
ENTWETOK UFPER AIR SOUNDING (1117152)
Pressure
(Millibars)
1000
850
7L8
Height
(Feet)
36h,
5,016
8, 530
Temperature
(°C)
26.3
17.7
11.0
|
Dew Point
(°C)
23.6
13.3
Ob:
a