WMOD00276

• Contract/Permit #: 85-5071
• Title: Cooperative Weather Modification Research Program - 1985 Field Operations Plan
• Date: 1/1/1985
• State: UT
• Weather Modification - Doc Type: Report

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6. Cloud physics and kinematics experiments.
A major objective of the 1985 field research program is to describe
the spatial and temporal distribution of supercooled liquid water in the
clouds over and near the Tw;har Mtns, the physical processes responsible
for precipitation development in the clouds, and the trajectories taken
by cloud and precipitation particles.
The cloud physics and kinematics investigations required to reach
this objective will involve the analysis and interpretation of a variety
of data. Most of the data will be collected with remote sensing instru-
mentation. The NCAR CP3 C.band Doppler radar will be placed at the base
of the Tushar Mtns (elevation 1884 m) (see Figure 1). The WPL Ka-band
Doppler dual-polarization radar will be located at a 2568 m elevated
"remote sensing" site in Merchant Valley on the slopes of the mountains.
The two radars will provid.~ information on .the growth of precipitation
particles and on their motions through the clouds. At the remote
sensing site there will als.o be the WPL dual-wavelength, steerable
microwave radiometer for measurements of liquid water amounts and the UU
polarization-diversity ruby- wavelength Iidar for observations of par-
ticle phase and shape. (Figure 4 shows the planned. positioning of
equipment at the remote sensing site.) I n addition to this array of
remote sensing instrumentatnon the AI supercooled liquid water detector
(based on the Rosemount aviation icing rate device) will be placed at a
high elevation (2975 m) exposed site likely to be in supercooled cloud.
Surface observations of p,"ecipitation mass, number and mass flux,
crystal habit, state of aggregation, state of riming, etc. will be made

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