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<br />Printed January 30, 1990
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<br />6. Conclusions
<br />
<br />Cloud seeding projects continue in many countries even as scientists seek to improve the scientific
<br />basis for applied weather modification. New sensors for monitoring atmospheric water, improved
<br />models of cloud systems, and the increasing power of modern computers are grounds for optimism
<br />that uncertainties about cloud seeding effects could be reduced appreciably over the next few years.
<br />However, lack of funding for cloud seeding research threatens to limit progress rather severely.
<br />Furthermore, some of the problems to be studied, such as the effects of seeding on hailstone growth
<br />inside clouds which are themselves continually changing, are so complex that definitive answers
<br />appear many years away. Until those answers are in hand, statistical results will continue to be the
<br />principal basis for decision-making regarding precipitation augmentation and hail suppression
<br />programs.
<br />
<br />REFERENCES
<br />
<br />AMS, 1984: Planned and inadvertent weather modification: A policy statem~nt of the American
<br />Meteorological Society as adopted by the Council on September 27, 1984. Bull. Amer. Meteor.
<br />Soc., 65, 1322-1323.
<br />
<br />Burtsev, I. I., 1980: Hail suppression activities in the Soviet Union. Papers Presented at Third
<br />WMO Scientific Conf. on Weather Modification, World Meteor. Org., Geneva, Switzerland, 547-
<br />554.
<br />
<br />Carswell, A. I., 1981: Laser measurements in clouds. In Clouds: Their Formation. Optical
<br />Properties and Effects (P. V. Hobbs and A. Deepak, eds.), Academic Press, New York, 363-401.
<br />
<br />Cooper, W. A., and R. P. Lawson, 1984: Physical interpretation of results from the HIPLEX-l
<br />experiment. J. Appl. Meteor., 23, 523-540.
<br />
<br />Crow, E. L., A. B. Long, J. E. Dye, A. J. Heymsfield, and P. W. Mielke, Jr., 1979: Results of a
<br />randomized hail suppression experiment in northeast Colorado. Part II: Surface data base and
<br />primary statistical analysis. J. Appl. Meteor., 18, 1538-1558.
<br />
<br />Dennis, A. S., and D. W. Reynolds, 1989: Seeding of shallow orographic clouds in the Sierra
<br />Cooperative Pilot Project. Papers Submitted to the Fifth WMO Scientific Conference on Weather
<br />Modification and Applied Cloud Physics. World Meteor. Org., Geneva, Switzerland, Volume I, 155-
<br />158.
<br />
<br />Dessens, J., 1986: Hail in southwestern France. II: Results of a 30-year hail prevention project
<br />with silver iodide seeding from the ground. J. AppL Meteor., 25, 48-58.
<br />
<br />English, M., 1987: Results of hail suppression research in Alberta, Canada. Preprints 11th
<br />Conference on Weather Modification: 7lh Conference on Hydrometeorology, Amer. Meteor. Soc.,
<br />Boston, Mass., 98-10 1.
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