A width-height measure of cloud shape is used to investigate possible effects of seeding summer cumulus clouds with silver iodide. Evidence is presented to show that seeding may cause decreases in the width-height ratios of cloud echoes and that these effects may extend beyond the region of silver iodide transport.

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1 Research supported under NSF Grant GA-851.

2 1968 winner of the AMS Father James B. Macelwane Award.