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<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 /> <br />the updraft and resulting in increased vertical growth. The <br />extended vertical growth leads to more condensation, and a longer <br />period of time for ice particle collection to proceed. In this way <br />larger ice aggregates are formed which then fall downward past <br />the melting level producing increased rain on the ground. <br /> <br />Additional seeding releases are designed to expand <br />the area of rainfall by seeding the "new development" of the cloud <br />complex. The seeding brings the cloud system to its rain stage <br />more quickly, expands the cool rain area, and if positioned properly <br />enhances the low level convergence of water vapor into the cloud <br />complex. Thus "dynamic" seeding emphasizes extending vertical <br />development of individual cloud cells, and the merger of individual <br />rain cells into an overall rain complex which then propagates <br />across the target area. <br /> <br />2. Storm Recognition <br />In previous seasons a radar reflectivity of 40-45 dbz <br />was used as a measure of the storm intensity at which seeding con- <br />centrations should be increased to hail suppression levels. This <br />hail criteria was further refined in Muddy Road IV and V. The main <br />change being the addition of height criteria; namely the hail threat <br />exists when the height of the 45 dbz contour reaches 25, 000 feet msl. <br />With the addition of the computerized display of range normalized <br />radar echo data, it became possible to ascertain this hail threshold <br />value conveniently and accurately. <br /> <br />E. Colorado Overflight Permit <br /> <br />In previous seasons there was concern that storms approach- <br />ing the Western Muddy Road counties could not be effectively modified <br /> <br />9 <br />