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<br />180 <br /> <br />material costs, and the pilot's pay. <br /> <br />6.6 SUMMARY <br />In conclusion, the trial program carried out in 1977 <br /> <br /> <br />and 1978 demonstrated the technical feasioility of clear- <br /> <br /> <br />air seeding using silver iOdide pyrotechnic flares mounted <br /> <br /> <br />on an aircraft. To ti1e lee of the Colorado Rockies, at <br /> <br /> <br />least, clear ice-supersaturated conditions can be forecast <br />12 to 24 hours in advance using information available at a <br /> <br /> <br />second-order National Weather Service facility. However, <br /> <br /> <br />in most of the situations which we were able to seed, the <br /> <br /> <br />seeding would have had little useful impact on the radiation <br /> <br /> <br />budget near the ground. Because the supersaturated regions <br /> <br />were generally formed in a standing wave pattern, seeding <br />material did not remain in supersaturated regions and clouds <br />formed were carried into regions of descent and warming <br /> <br />where they sublimated away. Finally, few reliable measure- <br /> <br />ments were obtained of cloud microphysical and radiometric <br /> <br />properties. Long term dispersion characteristics could not <br />be studied. <br /> <br />6.7 ACKNOWLEDGEMENTS <br /> <br /> <br />The operations described in this chapter Were carried <br /> <br /> <br />out by J.W. "Bill" Bullock of AIRO, Inc., and me with <br /> <br /> <br />support from Bernard vonnegut and Sally Marsh in Albany. <br /> <br /> <br />Dick Brandigar, Hugh Christian and Bob Mutu provided essen- <br /> <br /> <br />tial aircraft and electronic services. Chuck Walker served <br />