Cloud seeding with dry ice and silver iodide was conducted over the east coastal region of the United States during the periods January–April 1953 and December 1953–April 1954, to determine the effects of seeding on cyclone development. The experimental units employed were cases of potential cyclogenesis. After selection of the cases, seeded and control instructions were separated by a randomization procedure in consecutive pairs. Test variates were 24-hr area integrated precipitation and sea level pressure change. The data were reduced by the method of analysis of covariance. It was concluded from the statistical analysis that if the seeding had any effect on the large scale precipitation or on the pressure field, the effect was too small to be detected against the background of natural meteorological variance.
KeywordsSilver Iodide Trol Case Large Scale Precipitation Cloud Seeding Cyclone Development
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