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<br />July 8 to August 31, 1978. The original intent was to use it in <br />randomized tests of rain augmentation seeding. It was also made <br />available for high priority hail suppression operations. <br /> <br />Because of severe static electricity interference when <br />flying near thunderstorms, the data recorder and cloud physics <br />sensors were removed from the T-33 and installed in one of the <br />Navajos. Thereafter the T-33 was used only for seeding. I,. <br /> <br />D. Seeding and Radar Recognition <br /> <br />1. Dynamic Seeding <br /> <br />The main change in seeding technique evolved <br />around the "dynamic" seeding concept as developed in the <br />Flagstaff, Arizona and the NOAA Florida area cumulus experi- <br />ments. In this concept silver iodide is applied in the updraft of <br />convective clouds. The rapid glaciation of the supercooled <br />regions of the cloud updraft releases the latent heat contained in <br />the supercooled water, subsequently increasing the buoyancy of <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 /> <br />9 <br />