radar-equipped search aircraft.
3vailable,
Second, since initia] BRAVO ddta were
the method used to determine the air radex volume,
cnanged for high-yield bursts.
area, was
The new method considered the
itial ra-
jiation source as an area rather than a point.
On the morning of 26 March, a favorable forecast of H-hour
the following day set in motion once again the entire preshot
events.
Winds for
hedule of
This forecast gave east-northeast winds to approximataly 8,000
Feet (2.4 km), southerlies to about 12,000 feet (3.7 km), southpasterlies
so 20,000 feet (6.1 km), southerlies to southwesterlies to about
55,000
ceet (16.8 km), and east-southeasterlies to easterlies above 59,000 feet
(16.8 km).
All units and external agencies were notified accormiingly that
the ROMEO schedule was firm for 27 March at 0630.
~
Following the noon command briefings, CINCPAC was advised
the fore-
cast 72-hour air particle trajectories for 10,000, 30,000, 40,000, and
50,000 feet (3.05, 9.15, 12.19, and 15.25 km).
The advisory st&ted that
no significant fallout was forecast for populated Marshall atolf—s and rec-
ommended no closure of air routes.
It also stated that no fal
were forecast outside Area Green and that an intensive search
conducted in this area, plus a 240-nmi
(445-km) wide sector outg
(1,110 km), centered on a true bearing of 340°.
(The sector s
to 600 nmi
rch was
+ dpane
scheduled and run again postshot centered on 305° true from 200 nmi [370
km] to 600 nmi [1,110 km] from ground zero.
Starting at H-2,
ffpur search
aircraft were used on parallel flight tracks, with 60 nmi [111
age per aircraft, in advance of the cloud.)
.
In addition, CINCPAC was re-
quested to divert all shipping from the sector covering 260
90° true out to 450 nmi
(833 km)
km] cover-
from ground zero.
a statement that no known shipping was in this area.
°
clpBckwise to
The request§ included
Table 28
Known transient shipping near the Pacific Proving Ground
(PPG)
Bhows the
pn shot day.
At approximately 1500 the surface and air radex areas were fnnounced
as follows:
251