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It can be concluded that the physical chain of events (1 through 4) starting from the characterization of <br />the aerosols and the CCN at cloud base to the formation of precipitation in young deep convective <br />cumulus has been systematically documented during SPECTRA 1. The aircraft in situ observations and <br />the subsequent analysis of the data have successfully established the microphysical links between the <br />CCN and the precipitation forming mechanisms across the state of Texas. For the first time, a thorough <br />documentation of the CCN distribution at the cloud bases and their effect on the cloud drop size <br />distribution and precipitation forming mechanisms is available. <br />Recommendations <br />It is recommended strongly that the next steps in Texas in the development of an operational cloud <br />seeding technology should involve an interactive program of measurements and cloud modeling. The <br />initial focus should be continued model validation using the observations that have been made to date <br />and on the making of new observations that are needed critically for model validation. Cloud models are <br />showing increased sophistication with each year and much can be accomplished now by their use, <br />especially in understanding how glaciogenic and hygroscopic seeding affects Texas convective clouds. <br />5 <br />