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<br />Preliminary assessments of the first 3 years (1970-71, <br /> <br />1971-72, 1972-73), which had only 86 days show the following <br /> <br />~ <br /> <br />mixed conclusions: <br /> <br />. <br />~ <br /> <br />1. There is substantial confirmation of the physical <br /> <br />principles of winter cloud seeding and the specific <br /> <br />weather conditions or "seeding window" for increasing <br /> <br />precipitation. <br /> <br />2. The available forecasting and measurement systems <br /> <br />used in the project to determine the seeding window <br /> <br />conditions have been only partially successful. There <br /> <br />is a requirement for greater accuracy and frequency of <br /> <br />observation than originally thought. <br /> <br />3. The carryover or persistence of seeding material <br /> <br />in the area has been greater than anticipated. <br /> <br />Contamination of the experiment is perhaps causing <br /> <br />snowfall increases on days being called nonseeded. <br /> <br />These increases mask the seeding increases on seeded <br /> <br />days. <br /> <br />4. Diffusion of seeding material has often been <br /> <br />~ <br /> <br />affected by low-elevation inversions and winds that <br /> <br />~ <br /> <br />13 <br />