The interrelation between field programs and atmospheric modeling is discussed in the context of studies of weather modification. In particular, numerical models of convective clouds are considered. It is shown how activities in both field programs and modeling affect decisions concerning each other, culminating in the use of models for day-to-day "go" and "no go" decisions concerning the field programs. Illustrations are given from work done at RAND and elsewhere. A few typical results from the RAND cumulus dynamics model are presented. This talk was prepared for the 6th Skywater Conference, sponsored by the Bureau of Reclamation in Denver, February 10-11, 1970. 15 pp. Ref.
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