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was shown that an appreciable amount of precipitation occurred in the Salt River drainage under negative Vn conditions (i.e., wind flow from a northwesterly direction). Therefore, a fourth modeling simulation was made for northwesterly flow (BALDYNW). All four .locations cross the Mogollon Rim. Crest heights vary from over 11,400 feet (3480 m) for the two seeding simulations crossing Baldy Peak to 8650 feet (2640 m) for PRESWIN and to 7175 feet (2IBO .m) for SALTRVR. Vertical cross-sections for the four locations are shown in Figures 3.5 through 3.8 for PRESWIN, SALTRVR, BALDY, and BALDYNW, respectively. The figures also show selected meteoro- logical values used for model input (in these cases being within the optimum, stable criteria). 3.2.1 Modelinq Results for the Verde River (PRESWIN) Results of the model simulations for the Verde River drainage (PRESWIN cross-section) are listed in Table 3.1. Ground-based seeding atop Mt. Union (near Prescott) resulted in increases in precipitation in the Verde River drainage when the atmosphere was stable. The increases were much larger under convective conditions. The PRESWIN terrain profile was then altered to simulate seeding at Prescott instead of Mt. Union. The results showed no increases in the Verde River drainage with stable flow. Therefore, a remotely-controlled mountain-top seeder or an aircraft appears necessary to affect stable storms in the Verde River drainage. Seeding under stable conditions at the towns of Cherry and McGuireville produced no increases, as the vertical dispersion of the seeding plume was too restricted. In these cases, the vertical dispersion of the seeding plume was very limited. as it passed over the Mogollon Rim. Seeding at Cherry under more convective conditions resulted in good increases along the Mogollon Rim. However, many of the seeding- 3-13