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<br />Reclamation funded and conducted the initial field observation effort; DWR and other in-state cooperators <br />provided monetary support to Reclamation for analysis of the collected data. Further negotiation in early <br />1988 led to a more limited observational program over a different portion of the Mogollon Rim. Funding for <br />this 8-week effort primarily came from Reclamation while DWR and in-state cooperators again funded most <br />of the analysis and also the preparation of this report. <br /> <br />1.3 Program Objectives <br /> <br />j <br />I <br />J <br /> <br />The general objective of the field investigations was to obtain a sufficiently comprehensive data set from <br />which the augmentation potential of observed storms could be estimated. The primary goals for both field <br />efforts were to: <br /> <br />a. Document the storm situations in which excess supercooled liquid water exists in the form of <br />tiny cloud droplets. - The presence of supercooled liquid water is a requirement for significant ice- <br />phase seeding potential. Primary data used to establish the frequency of occurrence, magnitudes, <br />and durations of supercooled liquid water events were collected using Reclamation's microwave <br />radiometer. During the 1987 effort, these observations were supplemented by aircraft <br />measurements, which provided information on the spatial distribution of supercooled liquid water. <br /> <br />b. Establish the meteorological conditions necessary for supercooled liquid water production and <br />depletion. - Local and synoptic scale data were collected to classify storm types and identify specific <br />storm phases that produce supercooled liquid water in excess to that used in the natural precipitation <br />process. <br /> <br />c. Obtain the wind measurements necessary to estimate the amount of supercooled liquid water <br />transported over the target drainage areas. - This provides the upper limit for cloud seeding potential <br />as precipitation is derived from supercooled liquid water. <br /> <br />d. Estimate the potential for seeding with ground-released ice nucleation agents through tracer. <br />transport and diffusion studies. - Downwind measurements of the ground-released tracer gas were <br />made with an instrumented aircraft. <br /> <br />1.4 Report Contents <br /> <br />This report describes the field efforts, subsequent data analyses, and conclusions reached using combined <br />data from the two field programs. An executive summary is provided at the beginning of the report. Field <br />site selection, program organization and scheduling, and observed weather in relation to historical normals <br />are discussed in section 2. Field instrumentation and its use are described in section 3. (Those readers not <br />interested in field operations and equipment details may wish to resume reading at section 4.) <br /> <br />Analyses and results are first discussed in section 4 where observed storms for each season are classified in <br />relation to prevailing synoptic weather patterns and are further subdivided into specific storm phases that <br /> <br />2 <br />