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<br />.- <br /> <br />e <br /> <br />e <br /> <br />- <br /> <br />.. <br /> <br />rapidly, making targeting difficult. Other cells dissipated much more <br />slowly. The question of seedability of bands has not been answered at <br />this time. <br /> <br />10. The low-level jet is a very important consideration when establish- <br />ing seeding techniques for Sierra clouds. The rather common presence of <br />the jet during the 1978-79 season rE~quired seeding material releases <br />further upwind and more southerly. <br /> <br />11. The analysis of the 1978-79 datil to improve our understanding of <br />transport and diffusion yielded several conclusions. It appears that <br />the diffusion rate of seeding material in orogr'aphic clouds is on the <br />order of 1 m/s. This diffusion rate is low and indicates that seeding <br />materials will remain in relatively high concentrations in the seeded <br /> <br />area. The diffusion rate is higher (about 3 mls) in convective situa- <br />tions. This diffusion rate should permit good mixing of material in the <br /> <br />convective elements when combined with vertical motion and wind shear. <br /> <br />The 1979-80 field season proved to bE! one of the more frustr'ating but <br />exciting years for the SCPP. The major objective of the 1979-80 season <br /> <br />was to refine seeding techniques for the exploratory experiment. <br />Unfortunately, above-normal precipitation and warm temperatures caused <br /> <br />several long periods of suspended seed'ing operations. <br /> <br />During the field season, five randomized case studies were conducted on <br /> <br />2 days and addit iona1 seedi ng tests were conducted for 9 days. Seeder <br />air~raft operations were suspended for nearly 30 percent of the inten- <br /> <br />.. <br />sive field season. <br /> <br />1-9 <br />