Cloud Seeding Effects on Different Daily Rainfall Amounts

T. L. Ogden Division of Radiophysics, CSIRO, Sydney, Australia

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K. O. L. F. Jayaweera Division of Radiophysics, CSIRO, Sydney, Australia

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Abstract

The results of the cloud seeding experiment in New England, Australia, have been stratified to show different effects of seeding on different daily rainfall totals. No effect was detected on days with an area average rainfall of less than 0.1 inch, which contributed about 21% to the total rainfall. Days with between 0.1 and 0.5 inch, contributing 45% to the total rain, showed increases of 10–20%. The 0.5–1.0 inch class, contributing about 22%, showed an apparent 10% decrease. There were too few cases to give a meaningful result for heavier falls.

Abstract

The results of the cloud seeding experiment in New England, Australia, have been stratified to show different effects of seeding on different daily rainfall totals. No effect was detected on days with an area average rainfall of less than 0.1 inch, which contributed about 21% to the total rainfall. Days with between 0.1 and 0.5 inch, contributing 45% to the total rain, showed increases of 10–20%. The 0.5–1.0 inch class, contributing about 22%, showed an apparent 10% decrease. There were too few cases to give a meaningful result for heavier falls.

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