WMOD00594

• Title: Investigations of Winter Mountain Storms in Utah during the 1987 Utah/NOAA Field Program
• Date: 1/1/1990
• State: UT
• Weather Modification - Doc Type: Report

vertically pointing mode. It measured the amount of liquid water
and water vapor through the extent of cloud and atmosphere in its
viewing direction. The lidar collected data in the zenith direction
and, because of its polarization diversity, determined as a function
of time and height the phase, habit and rimed state of particles.
A supercooled liquid water probe was placed higher on the
mountain barrier at a more exposed site. It was used to measure
the liquid water content and flux of supercooled liquid water
passing the site.
The Merchant Valley location (M2 in Fig. 1) was the primary
site for precipitation microphysics observations. Crystal habit,
degree of riming, particle size, and the number and mass flux of
particles were observed. One lower site and three higher sites were
also at times used for microphysics observations (Ml, M3, M4, and
M5 in Fig. 1).
As shown in Fig. 1, eight recording precipitation gages were
positioned from west of rawinsonde site No. 2 to the downwind side
of the Tushar Mtns. The various types of instrumentation provided
a relatively comprehensive data set for each storm. The char-
acteristics of the remote sensors are listed in the Appendix.
c. Field organization
The field organization chart shown in Fig. 2 reflects the
cooperative nature of the Utah/NOAA program. Specifically, the
operational cloud seeding project and the research program shared
the rawinsonde operation. As illustrated in Fig. 2, Dr. Alexis Long
of DRI coordinated research support and the cloud physics studies,
while Mr. Dan Risch of NAWC directed the operational seeding project

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