WMOD00275

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

should thus be most valuable in those cloudy regions where the hydrome-

teors are in the middle stages of growth.

Although hydrometeor trajectories will be derived primarily from

the Doppler radar data they can be estimated to an extent and in a sup-

porting way from the time-height diagrams of Iidar linear depolariza-

tion ratio. Successively higher ratios along a path leading from a

higher level to a lower level of a cloud would be suggestive of a tra-

jectory of growing, falling precipitation particles. Because the lidar

data are collected primarily overhead this kind of analysis will require

separating time-dependent and advective effects. Radar data upwind of

the Iidar should be of help in this.

The surface microphysics observations will be used to confirm some

of the radar and Iidar ~stimates of particle trajectories. Confirmation

should be in terms of surface terminal point of the trajectory,

(equivalent) radar reflectivity factor of the particles, and circular or

linear depolarization ratio of the particles.

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