In 1990, G.
Mather reported a case of inadvertent seeding of clouds by
hygroscopic particles emitted from a Kraft paper mill in
South Africa that resulted in enhanced coalescence and
rainfall. This observation led to further hygroscopic cloud
seeding experiments in South Africa, (Mather et al, 1997),
Thailand (Silverman and Sukarnjanaset, 2000), Mexico (Bruintjes
et al., 2001, Fowler et al., 2001) and India (Murty et al.,
2000) with highly encouraging results. Additional
experiments have been conducted more recently in Texas
using powdered salt having particle diameters of 2 to 5
References for this section:
Bruintjes, R. T., D. W.
Breed, V. Salazar, M. Dixon, T. Kane, G. B. Foote and B.
Brown, 2001: Overview and results from the Mexican
hygroscopic seeding experiment. Preprints,AMS Symposium on
Planned and Inadvertent Weather Modification, Albuquerque
Cooper, A. C., R. T. Bruintjes, and G. K. Mather, 1997:
Calculation Pertaining to Hygroscopic Seeding with Flares.
Journal of Applied Meteorology: Vol. 36, No. 3, pp.
Mather, G. K., D. E. Terblanche, F. E. Steffens, and L.
Fletcher, 1997: Results of the South African cloud-seeding
experiments using hygroscopic flares. Journal of Applied
Meteorology: Vol. 36, No. 11, pp. 1433-1447.
Silverman, B. A. and W. Sukarnjanaset, 2000: Results of the
Thailand warm-cloud hygroscopic seeding experiment. J. Appl.
Meteor., 39, 1160-1175.