acceptable for water surface shots.
|
(g)
Although vind patterns can develop im wiich mid-level
winds.are from favorable directions, the veetor summation of the winis mst
have sufficient ecutherly esmponent to carry the tulk xf the mid-level ictris
far encugh north of ground sero so that crosswindani upvind spread of ect
taminatica dces not overlap populated areas of the shot atoll,
(h) Trade winds act in excese of 20,000 feet for water
surface shots at SIKINE present no fall-out problem for ENTWETOK, amd probably
no serious problems in the case of land surface shots. Trades in excess of
20,000 feet could be sericus for the land burst, ami progressively eo for
water bursts.
(3)
Fall-out Forecasting Systeme
(a) Forecast systems based on the ground sero winds were
useful for closerin fall-out predictions end for RADEX plots valid for pericds
up to about six hours.
(bo) The method of vector summation of the winds as used at
previous operep}iona et the WPG ami the PPG wag inadequate to cope with tha
significant longerange (beyond about Hf 6 to H 4 10 hours) fall—<cut encoun
tered on high yield sicts, The major inadequacy of this system, and -f all
other systems existing price to the operss{oa, 1s its complete reLimce on
the ground sero winds, 1,0. on 6 wind pattern for one gecgraphical locetioca
and for a spesifis tims.
Originally, this system was extended by 4 general
analyadie of the forecast air particle trajectories.
Subsequently, the dyna~
mic system of long-range fall-out plotting developed during CASTLE corrected
these defielencies by progressive forecasts ‘tor beth time and displacement
for the first 2hetwur period post-elct.
Mh