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<br />Application for Permit for Weather <br />Modification Activities <br /> <br />7. Dr. L. D. James, Director <br />Utah Water Research Laboratory, UMC 82 <br />Utah State University <br />Logan, Utah 84322 <br /> <br />under partial support from the National Science Foundation, Experimental <br />Meteorology Section (Dr. Richard Dirks) in cooperation with <br /> <br />Dr. Bernard A. Silverman, Chief <br />Office of Atmospheric Resources Res. <br />Bureau of Reclamation, P.O. Box 25007 <br />Denver Federal Center, Bldg. 56 <br />Denver, CO 80225 <br /> <br />8. Operational plan <br /> <br />a) nature and objectives of the proposed project: <br /> <br />The primary objective of the proposed project is to obtain distinct, <br />reproducible effects from seeding appropriate winter orographic clouds. <br />The basic hypothesis is that when clouds are found to contain supercooled <br />liquid water with little or no precipitation occurring, then the addition of <br />ice nuclei by balloon carried payloads released 30 to 50 km upwind of a <br />mountain barrier will result in precipitation. By sending up balloons at <br />known time intervals a definite identifiable pattern of precipitation can be <br />produced and documented. This approach will lead to a knowledge of how much <br />precipitation can be artificially induced under various conditions. <br /> <br />b) map attached: the letter A refers to the approximate intended <br />location of project headquarters, i.e., near the Grand Junction airport. <br />The Letters B refer to the approximate ends of the line of seeding sites. <br />Mobile releases may also be made from time to time along the heavy arcs be- <br />tween letters D. The letter C refers to the specific target where ground <br />based observations will be made. The rectangular area might reasonably be <br />affected by the seeding, although the magnitude of the effects is expected <br />to be very small. Note that only the sites likely to affect the target will <br />be used; these will depend primarily upon airflow at cloud levels. <br /> <br />c) implementation of the project is as follows: <br /> <br />Seeding will be carried out only when the following conditions exist: <br /> <br />i) microwave radiometer measurements show substantial supercooled liquid <br />water is present (total vertical liquid content greater than 0.25 mm) <br /> <br />ii) little or no precipitation occurring in the target area <br /> <br />iii) airflow across the barrier at least 7 m s-1 at seeding altitude <br /> <br />iv) environmental conditions are appropriate (no excessive snowpack, <br />avalanche or other hazards identified) <br />