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<br />drainage. Effects with dry ice tended to occur nearer the <br />seeding location. In this case, most increases from dry ice <br />seeding occurred in the Gila River drainage. <br /> <br />3.2.4 Modeling Results for the Upper Salt River (BALDYNWl <br />Precipitation associated with northwesterly winds accounts <br />for over ten percent of the seasonal total in the Salt River <br />drainage. Results of seeding simulations for this condition <br />(given in Table 3.4) showed very favorable increases, whether <br />stable or convective. Model simulations of seeding in the <br />Taylor-Show Low area produced the largest increases of any <br />of the simulations used in this study. Results were also <br />very good with aerial, silver iodide seeding along Victor <br />Airway 190N near Taylor. <br /> <br />3.2.5 Summary of Model Results. These seea~ng simulations <br />have shown that, except for the Baldy Peak region, either <br />remotely-controlled, mountaintop seeders or aircraft would <br />be required to increase precipitation from the stable storms. <br />Two factors are to blame. First, much of the Mogollon Rim <br />is not very high,.with crest heights in the 2000 to 2500 m <br />(7000 to 8500 ft) range. Second, air mass temperatures are <br />too warm, such that the -SoC level (where silver iodide ice <br />nuclei start to activate) is too high above ground level. <br />The stable air mass restricts vertical diffusion of the seeding <br />plumes into these colder cloud regions. <br /> <br />Much better success was found when convection was simulated. <br />In these cases, convective updrafts can carry a ground-based <br />seeding plume up into colder regions with beneficial results. <br />Low crest heights were not a problem. However, it should <br />be kept in mind that much of the precipitation increases in <br /> <br />3-23 <br /> <br />- -- <br />