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<br />Appendix of this study shows "NA" for the months of May-August for Healy, Leoti and <br />Scott City, Kansas. The U.S. Deparnnent of Commerce Climatological Data: Kansas. <br />Annual Summary 19606 lists precipitation values for each of these 12 data points. In <br />each case, the precipitation values, listed for 1960, correspond to those listed in the <br />Appendix of this study for 1961 for these three weather stations. Likewise for these <br />three weathe:- stations the figures reponed for 1962 in the Appendix are actually 1961 <br />precipitation values. For 1962, the precipitation values published by the U.S. <br />Deparnnent of Commerce for these three stations do not appear to be listed anywhere <br />in the Appendix of this study. TItird, a statistically unbiased estimate of the increase in <br />precipitation that may be due to cloud seeding is given by: <br /> <br />(XT - >.c ) - (xT - x"J, where <br />1 1 2-z <br /> <br />XT == <br /> I <br />Xc == <br /> 1 <br />XT == <br /> 2 <br />Xc == <br /> 2 <br /> <br />the seasonal mean precipitation for target stations during the cloud seeding period. <br /> <br />the seasonal mean precipitation for control stations during.. the cloud seeding <br />period. <br /> <br />the seasonal mean precipitation for target stations prior to the cloud seeding <br />period. <br /> <br />the seasonal mean precipitation for control stations prior to the cloud seeding <br />period. <br /> <br />In summary, the occurrence of cloud seeding activities in the control area would tend to <br />cause the study to underestimate the impact of the Western Kansas Weather Modification <br />Program. The data problems existing in this study and the method used to estimate the <br />increase in precipitation could have impacted the conclusions in either a positive or <br />negative manner. Hence, it is not clear if the survey conclusion of an 11 percent <br />increase in precipitation is appropriate or if it represents an overestimate or an <br />underestimate. <br /> <br />6 Deparnnent of Commerce, U.S. National Oceanic and Atmospheric Administration. <br />"Climatological Data. Kansas, Annual Summary 1960," Volume 74, No. 13, pp. 212-225. <br /> <br />8 <br />