WMOD00506

• Title: The Persistence of Seeding Effects in a Winter Orographic Cloud Seeded with Silver Iodide Burned in Acetone
• Weather Modification - Doc Type: Report

~eickman, H.K., 1974: The mitigation of Great Lakes storms. ~eather and

Climate Modification, Y.N. Hess, Ed., Wiley and Sons, 318-354.

FIGURE CAPTIONS

Fig. 1 Measurements by the research aircraft at the seed1ine prior to seeding.

Both the uncorrected and corrected particle concentrations are shown

for the 2D-C and 2D-P. The uncorrected concentration is the solid line

above the shaded region and represents the concentration of all images

sensed by the probe.

The FSSP,

and corrected 2D-C,

and 2D-P

concentrations are presented as a cWllulative size distribation. The

top of each shaded region represents the concentration of all particles

< to the size (~m) indicated by the gray scale at the right.

I n the

bottom panel liquid water content is given by the solid line, and ice

nucleus concentrations by the dashed line.

Fig. 2 Meas~rements, as in Fig. 1, by the research aircraft, a) 1815-1830, b)

1830-1845, while following the seedline out to 19 min.

APD represents

the distance of the aircraft from the pointer location. Seedline

interception points and seedline age (min) are show~ at the bottom.

Fig. 3 Images from the 2D-C and 2!)-P showing water drops, and frozen drops

with protruding needles.
t ,..-. .;l.. 1) - C

~
f r':'"

~~
J. 1_ ~- r- -'l'-:_" _ ~_r -.

P" a{_~...~_..._
.-

J ! .....:.._1::- ;-'1

...: ~_!. _-- -1 !-_-i--.~.

Fig. 4 Measurements, as in Fig. 1, by the research aircraft, a) 1915-1930, b)

1930-1945, while tracking the seedline between 64 and 92 min after

seeding. Seedline interception points and seedline age (min) are shown

at the bottom.

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