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<br />Hypothesis I refers to static seeding while Hypothesis 2 refers <br />to dynamic seeding. Emphasis will be on experimentation with the goal <br />of achieving a better understanding of the physical processes. <br />4.2 Convective (thunderstorm) Complex <br />A seeding hypothesis was developed for convective complexes <br />although these cases will be considered exploratory in nature and will <br />not be given as much emphasis in the experimental program as growing <br />cumulus clouds. The hypothesis for seeding turrets associated with a <br />convective complex or multiple complexes is as follows: <br />Hypothesis 3: An increase in the ice crystal concentration in <br />growing turre'ts associated with individual thunderstorms or a cluster <br />of thunderstorms in the region where cloud water is present and the <br />temperature is -40C to -IOoC, will lead to additional precipitation <br />through the base of the cloud system. The sequence of processes leading <br />to this increase is hypothesized to be: <br />a. Production of greater than or equal to 100 per liter <br />ice crystals in the super-cooled water clouds from <br />-40C to -IOoC. <br />b. Substantial glaciation of a cloud with associated <br />release of I atent heat and buoyancy increase. <br />c. Increase in height of the turrets. <br />d. Increased mesoscale moisture flux into the cloud <br />and condensation within the cloud. <br />e. Conversion of extra condensate to precipitation. <br />f. Fall of precipitation through cloud base. <br />g. Increased sub-cloud convergence, more vigorous <br />downdrafts, and interaction between them. <br />h. Increase in mesoscale vertical transport of moisture~ <br />in the mid-troposphere. <br />i. Changes in the characteristics of radar echoes <br />and new cell development such as intensi.ty, <br />height, and areal extent. <br />j. Changes in precipitation patterns. <br /> <br />12 <br />