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<br />3 <br /> <br />3. A delivery mechanism for the AgI. It must be possible to deliver <br /> <br />adequate quantities of the seeding material to an appropriate location in <br /> <br />the cloud~ such that the resulting ice will convert water to precipitation <br /> <br />that would have been lost othenvise. <br /> <br />4. Sufficient residence time. If a specific target location is being <br /> <br />considered (as in the San Juans~ where the target area was ~vest of the <br /> <br />Continerital Divide)~ the transport~ diffusion~ nucleation, and growth pro- <br /> <br />cesses must have sufficient time to operate. As we shall see, this may be <br /> <br />a serious problem in the San Juan Mountains. <br /> <br />Section II of this report discusses the data obtained and utilized for <br /> <br />this study. Included in this section is a table of the flight periods, and <br /> <br />the stage of storm development during those flights. <br /> <br />Section III is a general discussion of our results. We present here <br /> <br />the basic conclusions~ with illustrations chosen frOTIl our case studies and <br /> <br />~vith generalizations drawn from all the cases. This section includes a dis- <br /> <br />cussion on the general storm structure and airflow patterns, the regions of <br /> <br />supercooled water in these storms, the ice crystal concentrations~ and the <br /> <br />characteristics of the AgI transport and diffusion. We also present our <br /> <br />assessment of the seedability of the San Juan storms in this section. <br /> <br />Section IV includes a discussion of some of the aircraft instrumentation. <br /> <br />This section is included because several of the instruments used were ne\v and <br /> <br />there is little literature to which to refer for performance characteristics. <br /> <br />Also, some of the data analysis techniques were developed specifically for <br /> <br />this research. A brief discussion of some conventional instruments is in- <br /> <br />cluded because certain of their characteristics are important in interpreting <br /> <br />the data presented. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I' <br />I <br />I <br />I <br />I <br />