“7
;i
m uke order of twelve to eighteen hours for significant
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*
2 ¥O Occur.
The variation in time arises fraz considera~
of wind shear, with more diffuse and less sigzuifticast ine
2aS ata given time associated with lesge anguler asd
_, smear.
For this reason,
1% was required that actuel wind
_.sations and forecasts immadiately before shot tins and
.wout Shot day be continuously considered in their relatica
2a forecast conditions for the first twenty-four hours
i
:36 shot.
»
PRS-SzoT BRIEFINGS:
~weShot ccoumand briefings:
a.
The following were presensed at
Weather
.
Weather conditions during the five days prior to
' adicated a favorable trend for BRAVO day with easterly
- alow 15,000 feet and winds of a southerly componest
-. Tye situation presented at E-6 hours for the subsequest
~ period (18 hours efter shot time) was satisfaccary. The
“~ -2 period to begin 18 hours after shot time was predicted
~ an unfavoreble trend as northwest winds were forecast
~@ 10,000 to 20,000 foot levels.
FRadSafea
(1) Resultant wind diagrams including latest
.
™~™t winda and forecast winds for & Hour aad the 72 dsur
cajectories, which gave a fellout pavtern in a narror
.
_
“" * # the east northeast end a wide (140°) sector to tbe
“sh vary glow resultant winds. (See Figure 1).
-
:. (2) Surface radex, HE to E plus 6 hours.
(3) Outiecks for:
(See
_
(a) Bikint: Unfavorable; Eniwetok: Farorabie;
- Favorable, end the native populated atolis in sortheest
L rrube ) © Albi «| ~geenaberenr @
‘
de
from ground zero favorable, since resultant winds is
“Shion of these erees were considered too slow to move
at fallout to the atolls involved.
(>} Tesk Toree fleet: Favorable, provided
4 out at leest SO ciles.
-
mAh
TF‘
ty ‘
. ot
1
wie
os
soe
3S
i
Gt
Since radioactive parsicsle tra-
~" . determined primarily by the winds at each level, it is
*- wd that winds must be fram favorable directions a> vasye
* (shin the outer limits on fevorable directions durisse tke
« .¢ fallout. The eriticel faliout period was considered te
!
CJ
SOF Pre TOTape cert
6. A critical problem in predicting fall~-sat ise
ws forecasting the stability or lack of stability of tke
.attern after snot time.
ba
FEE OF °
fa
F-17a T-STE F-die
wo
TEETO LL ONY
TORLLOSaSTT
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be
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een,
ongp
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wo
wm swe
at
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