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<br />development of seeding methodologies. Other types of activities, such as <br /> <br />examination of cloud microphysical processes, may require further study at <br /> <br />each site because of known or suspected north-south gradients in cloud and <br /> <br />climatic properties. <br /> <br />The experimental design for HIPLEX is based on the recommendations of <br /> <br />the Illinois State Water Survey (ISWS) as presented in the ISWS Design <br /> <br />Document entitled, "Design of the High Plains Experi.ment with Specific Focus <br /> <br />on Phase 2, Single Cloud Experimentation," This doc:ument, dated June 30, <br /> <br />1976, is available from the Office of Atmospheric Re~sources Management (OARM) <br /> <br />in Denver, Colorado. <br /> <br />The HIP LEX design is of an evolving nature, As: knowledge increases, <br /> <br />it will be used to modify and upgrade the experiment: to optimize its learning <br /> <br />efficiency. HIPLEX ,.,ill be a three-phase experiment: under the present <br /> <br />concept. The first phase is of an exploratory nature leading to a better <br /> <br />understanding of natural precipitation processes and the design of a random- <br /> <br />ized seeding experiment for semi-isolated clouds and cloud complexes. <br /> <br />Activities of the 1978 season will be part of the first phase. The second <br /> <br />phase will be the actual conduct of the randomized seeding experiment which, <br /> <br />if successful, 'l1ill lead to the design of a wide-area seeding experiment. <br /> <br />The third and final phase would be the wide-area experiment which would <br /> <br />attempt to increase the net rainfall over several thousand square kilometers, <br /> <br />The 1978 Miles City field program will be diffE!rent in scope from the <br /> <br />1977 program. A very comprehensive high-quality data base was collected <br /> <br />during the 1976 and 1977 seasons; consequently, it is now possible to <br /> <br />place increased emphasis on various analyses and design efforts leading to <br /> <br />the final design for the randomized experiment scheduled to commence in the <br /> <br />summer of 1979. Aircraft sampling in 1978 will be limited to June and July, <br /> <br />1-2 <br /> <br />" <br /> <br />e <br />