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<br />0027)3 <br /> <br /> <br />result of the 30 cases, shown in Figure 4, was a slight decrease in precipi- <br /> <br /> <br />tation at a probability of .09 which is not significant. With moderate to <br /> <br /> <br />high instability, a blow-over trajectory, a low water content, and cloud tem- <br /> <br /> <br />peratures colder than -30oC, as shown in Figure 5, significant decreases of <br /> <br /> <br />over 50% were found as you would expect. <br /> <br />Kahan: It is important to tell people when you talk about a 200% <br /> <br /> <br />increase what actual precipitation has been increased by 200%. In other <br /> <br /> <br />words, 200% of a very small amount of precipitation is not very much. <br /> <br /> <br />Vardiman: Censare had a lot of high percentage increases, and I would not put <br /> <br /> <br />too much value on the large percentages until we determine whether the in- <br /> <br /> <br />creases are real. It is possible that the values from the Censare project <br /> <br /> <br />inflated the results, unduly. <br /> <br /> <br />It is also important to take into account that often cloud seeding causes ~ <br /> <br /> <br />more precipitation events, whereas naturally you would have had a zero event. <br /> <br />I <br />'- <br />'- <br /> <br />If you divide a number by zero, you get infinity. Therefore, seeding-caused <br /> <br /> <br />changes from zero events to precipitation events can show large percentage <br /> <br />increases even though the real increases in water may be small. <br /> <br /> <br />Keyes: Thank you Larry. The next topic will be a presentation of <br /> <br />the Utah Weather Modification Program. <br /> <br />. <br /> <br />3. Utah's Statewide Program - Paul Summers, Utah Division of Water <br />Resources <br /> <br />I appreciate being here and having the opportunity to talk about Utah's <br /> <br />Weather Modification Program. First, some background. The Utah law which <br /> <br /> <br />was passed in the 1973 legislature, is titled Cloud Seeding to Increase <br /> <br /> <br />Precipitation. This law states, <br /> <br />'- <br /> <br />"The State of Utah through the Division of Water <br />Resources shall be the only entity, private or public, <br />that shall have authority to authorize, sponsor, and/or <br />develop cloud seeding research, evaluation, or implemen- <br />tation projects to alter precipitation, cloud forms, or <br />meteorological parameters within the State of Utah, ex- <br />cept cloud seeding for suppression of fog is excluded. <br />The' Division of Water Resources shall authorize, sponsor, <br />and/or develop local or statewide cloud seeding projects <br />that conform to overall state water planning objectives <br />and are determined to be feasible by the Division of <br />Water Resources. ...A cloud seeding project as used in <br />this act shall be a planned project to evaluate meteor- <br />ological conditions, perform cloud seeding, and evaluate <br />results." <br /> <br />10 <br />