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<br />componeJlts are not developed to comparable levels. <br /> <br />Some ot the components that play an important role in the development of <br />precipitation, yet where scientific knowledge is lacking are: <br /> <br />i) The synoptic and mesoscale forcing mechanisms of convective clouds in the locality <br />ot interest. <br /> <br />il) The dependence of microphysical properties in convective clouds and seeding <br />response on synoptic and mesoscale conditions. <br /> <br />! <br />I <br />) <br />I. <br /> <br />ill) The importance of the various growth processes from ice nucleation to precipitation <br />and the effect of seeding on these processes. <br /> <br />iv) The type and amount of seeding material necessary for an optimum- response to <br />enhance rainiall. <br /> <br />I <br />I <br />I . <br />,"."-"" <br /> <br />Moving upscale to larger and more complex cloud systems and developing a new <br />seeding hypothesis for treatment of these clouds will necessitate consideration of mesoscale <br />and synoptic scale processes that aft"ect the precipitation over a larger area, and how <br />cloud seeding will change them. We need to better understand forcing mechanisms for <br />convective clouds to be able to detect preferred areas for cloud development and to <br />understand the organization of convection. The interaction between the mesoscale and <br />large scale environment, and its effect on the development of storms and distribution <br />of precipitation are of primary importance in developing a physical hypothesis for <br />precipitation enhancement in convective clouds. Better covariates for field experiments <br />are needed that can describe the distribution of precipitation over a larger area. Field <br />experimeJlts conducted in combination with theoretical and numerical modelling efforts <br />seem to offer the greatest opportunity for providing the understanding necessary to <br />successfully and consistently achieve the desired results. <br /> <br />The variability among natural clouds in space and time was in the past and still is <br />one of the primary obstacles in developing a sound physical hypothesis for cloud seeding. <br />Individual clouds and storms can differ substantially on a single day in one area and can <br /> <br /> <br />13 <br /> <br />. <br /> <br />. <br /> <br />. <br />