FLATHEAD EVENT
OPERATION REDWING
,
1,
The FLATHEAD Shot was fired at O&26H, 12 June 1956 on a barge
i— Jocated approximately one~half mile South of YUROCHI Island (DOG) in the
BIKINI Atoll.
The cloud reach
et.
The lower
portion of the cloud and stem moved to the West at approximately 15 knots.
2.
The fallout forecast for FLATHEAD was calculated on the basis
of a water surface burst and a
Program
‘THO fallout mummary on H+1 Day indicated the fallout sector as 210°
through O50" extending 100 miles with probable hot line onbearing 010°
with an average intensity on the surfece of the water of 1 mr/hr. The
plus 8-hour summary gave seme sector with hot line definitely fixed on
bearing of 310°.
Program TWO surveys confirned the fallout forecast to be
within the acceptable error of forecesting. |
3.
Cloud penetration aircraft reported the middle and upper portion
of the cloud moving to the northeast at Ht] Hour.
The cloud contimed te
move in a general north-northeasterly direction throughout H+3 Hours.
. The aerial monitoring (F2V aircraft) reported the ENYU (NAN) air~
strip te be free of debris and radiological hazards, Based on survey
information Reentry Hour was established at 0830M, 12 June.
The initial
helicopter survey at H+3 hours reported fallout still occurring over the
reef and lagoon in the vicinity cf ‘YUROCHI (DOG).
Fig dif
Sanz, anole,taf.
“
Sire HUT
-"s
—
* tithe
NOLS
sere
In general, the initial