COMMENTS ON CLOUD SEEDING

In partial response to Young, tests with advanced numerical models are suggested for evaluation of net effects of seeding on precipitation i n seeded and adjacent areas. Shower seeding in the U.S. plains cannot produce significant precipitation unless there is stimulation of the f low process that forms clouds. Several papers on cloud seeding project s in west Texas are discussed. These papers are thoughtfully developed , but some claimed effects are insignificant in magnitude, others are necessarily inconclusive at best, and important problems such as possi ble redistribution of natural rains by seeding are untreated in the pa pers and related experiments, if reasonable prudence is to attend use of resources, then future cloud seeding studies must be guided in part by advanced theoretical studies and all cloud seeding programs must b e attended by carefully developed means to evaluate the results.