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<br />This Operations Plan presents research objectives and routine operations to <br />be performed during the 1983-84 winter season. It includes plans for the <br />continuing SCPP-1 randomized experiment on cellular convection as well as a <br />shakedown for a SCPP-2 experiment on orographic precipitation~ More <br />specific details are provided in the plans for radar and aircraft opera- <br />tions, the use of ground-based data collection equipment, forecasting <br />procedures, and personnel deployment. <br /> <br />B. SCPP - HISTORY <br /> <br />Preliminary planning and studies for the SCPP began in 1972. During the <br />next 3 years, environmental and societal studies ass1essed the need for <br />and feasibility of weather modification research in the Sierra Nevada. <br />An initial design of the field research program was completed in 1975-76. <br />Agreement was also reached with the U.S. Forest Service for the SEP (Sierra <br />Ecology Project) to assess the effects of additional precipitation and melt <br />watet:' on Sierra Nevada ecosystems. Studies by Ca1 ifolr-nia State agencies <br />yielded additional information on the possible effects of increased pre- <br />cipitation on highway safety. <br /> <br />Four field seasons - 1976-77 through 1979-80 - were devoted to intensive <br />data collection and calibration seeding trials. The 1980-81 season was <br />dedicated to analyzing data collected during the prE~vious 4 years and <br />gathering more information about low-level liquid watel~ in Sierra storms. <br />The 1981-82 and 1982-83 field seasons were spent finalizing and start- <br />ing the SCPP-1 experiment and doing calibration seeding during SCPP-2 <br />conditions. <br /> <br />1-2 <br /> <br />J <br /> <br />~ <br /> <br />e <br /> <br />e <br /> <br />e <br />