——s
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Loess
Project 11.2 - Sampling - H. F. Plank
P, F. Moore
EQUIPMENT
a
Seven aircraft equipped for cloud sampling as described in the
Report were used on this mission:
"A" flight, Tiger White I (F-84); "B" flight,
Tiger White II (F-84); "C" flight, Tiger Blue I and II (2-F-€4's); "D" flight,
Tiger Yellow I and II (2-F-84's); and Cassidy II (B-57) the control aircraft.
WEATHER
The wind pattern was in general suitable for sampling, with winds blowing
uy
from the East at velocities up to 17 knots at expected sampling altitudes but
with very little change in direction or velocity, i.e., a favorable wind shear.
As zero time approached, Cassidy II observed a large cumlus cloud structure
running up to about 32,000 feet sitting over ground zero, which could have com
pletely obscured the bomb cloud for sampling purposes,
The 10 minute delay in
shot time allowed a big hole in the cloud system to move over ground zero and the
bomb cloud went into this hole and remained visible throughout the sampling
operation.
CLOUD DESCRIPTION
The bomb cloud rose in an anvil headed column to about 32,000 feet (10,000
feet higher than the prediction) and spread out into the hole in the natural
cloud structure.
The top of the bomb cloud penetrated into a solid overcast at
31,000 feet and the bottom of the bomb cloud emerged from the top of another
overcast at 15,000 feet.
Big cumulus columns were ranked about, joining the
undercast and the overcast and forming a larged closed amphitheatre within which
aircraft could fly and still easily see the bomb cloud standing in the middle.
C
L4 MV
ke OE
- 2 =
al
A