A systematic cloud-seeding experiment was conducted in the Prenestine Hills, east of Rome, during the period of time Jan. 1966 – June 1968. The objective was to determine whether the use of monodisperse, electron-emitting giant condensation nuclei, and of giant Al2S3 ice-forming nuclei, both recently developed in our laboratories, could increase the precipitation over an area circumjacent to the site of aerosol dispersion. The method of evaluation involved comparisons of precipitation fallen during the week which followed the aerosolization of about 15 kg. of particulate matter, to the precipitation collected during the fortnight aftet that period. The results show that despite a relatively small amount of nuclei used per seeding operation, and notwithstanding an apparently handicapped design of data evaluation, the normalized and cumulated ratios of precipitation events, associated with those periods of time, indicate significant increases during summer and autumn, and significant decreases during winter season, over the area considered.
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A. C. Montefinale, T. W. Zawidzki, G. L. Petriconi andH. M. Papee,Combustible compositions for generating aerosols for cloud-modification and weather-control. Note I: Giant condensation nuclei. Ric. Sci. (Rome)39 (1970), 828–34.
A. C. Montefinale, T. W. Zawidzki, G. L. Petriconi andH. M. Papee,Combustible compositions for generating aerosols for cloud-modification and weather-control. Note II: Experiments on dissipation of warm valley-clouds. Ric. Si (Rome)39 (1970), 835–42.
A. C. Montefinale, T. W. Zawidzki, G. L. Petriconi andH. M. Papee, Combustible compositions for generating aerosols for cloud-modification and weather-control. Note III: Giant Al2S3 ice-forming nuclei and related preliminary field-tests, Ric. Sci. (Rome)39 (1970), 843–9.
L. J. Battan,Relation between cloud-base and initial radar echo, J. Appl. Meteor.2 (1963), 333–6.
K. Isono, M. Komabayashi, T. Takahashi andT. Gonda,A physical study of solid precipitation from convective clouds over the sea. Part. IV. Importance of giant sea-salt nuclei in formation of solid precipitation. J. Meteorol. Soc. Japan II44 (1966), 308–19.
H. G. Houghton,On precipitation mechanisms and their artificial modification. J. Appl. Meteorol.7 (1968), 851–9.
J. E. Jiusto, R. J. Pilie andW. C. Kocmond,Fog modification with giant hygroscopic nuclei. J. Appl. Meteor.7 (1968), 860–9.
E. X. Berry,Modification of the warm-rain process. Proc. 1st.Natl. Conf. Weather Modif, (Amer. Meteorol. Soc., Boston (1968), 81–8.
N. A. Peterman,Hygroscopic treatment of warm-cloud precipitation. Proc. 1st. Natl. Conf. Weather Modif. (Amer. Meteorol. Soc., Boston 1968), 107–13.
W. E. Howell andM. E. Lopez,Cloud-seeding in Southern Puerto-Rico,April – July 1965. J. Appl. Meteorol.5 (1966), 692–6.
K. R. Biswas, R. K. Kapoor, K. K. Kanuga andBh. V. Ramana-Murty,Cloud-seeding experiment using common salt, J. Appl. Meteor.6 (1967), 914–23.
Bh. V. Ramana-Murty andK. R. Biswas,Weather-modification in India. Proc. 1st.Natl. Conf. Weather Modif. (Amer, Meteorol. Soc, Boston 1968), 71–80.
R. N. Chatterjee, K. R. Biswas andBh. V. Ramana-Murty,Results of cloud-seeding experiment at Delhi as assessed by radar. Indian J. Meteor. and Geophys.20 (1969), 11–6.
A. C. Montefinale andH. M. Papee,Preliminary tests on large-scale suppression of warm fog by means of giant monodisperse particulates. Part I. The first Ghedi-Monte Orfano experiment. Pageoph83 (1970/VI), 167–172.
G. Suits,The collected works of Irving Langmuir: Vol. 11. — Cloud Nucleation, (Pergamon Press, New York 1962), Chapter 4.
G. W. Brier, T. H. CarpenterandD. B. Kline,Some problems on evaluating cloud-seeding effects over extensive areas — Proc. Vth. Berkeley Symp. Math. Stat. Prob. Vol. V. Weather Modification experiments, (Univ. Calif. Press, Berkeley (1967), 209–21.
K. J. Brown andR. D. Ellioti,Large-scale dynamic effects of cloud-seeding. Proc. 1st Natl. Conf. Weather Modif. (Amer. Meteor. Soc., Boston 1968), 16–25.
J. Neyman andE. Scoti,Further comments on the ‘Final Report of the Advisory Committee on Weather Control. J. Amer. Statist. Assoc.56 (1961), 580–600.
E. Perez Siliceo, A. Ahumada andP. A. Mosino,Twelve years of cloud-seeding in the Nexaca watershed, Mexico, J. Appl. Meteor.2 (1963), 311–23.
C. A. Bennett andN. L. Franklin,Statistical Analysis in Chemistry and the chemical Industry (J. Wiley & Sons Inc. New York 1967), 15.
E. G. Bowen,Lessons learned from long-term cloud-seeding experiments. — Proc. Internat. Conf. Cloud. Phys. Tokyo, 1965, pp. 429–33.
K. R. Gabriel, Y. Avichai andR. Steinberg,A statistical investigation of persistence in the Israeli artificial rainfall stimulation experiment. J. Appl. Meteor.6 (1967), 323–5.
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Montefinale, A.C., Petriconi, G.L. & Papee, H.M. A biennial systematic test of some newly-developed cloud-seeding nucleants, under orographic conditions. PAGEOPH 83, 182–200 (1970). https://doi.org/10.1007/BF00875111