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My name is Jan Tetstone. I am 72 years old.

I was twenty [20] when the most devastating hurricane in thr history of the United States ripped across the Gulf Coast in August, 1969, destroying both life and property.

Hurricane, Debbie, was reported weakening on August 18 and 20, after it was seeded by aircraft of the Environmental Science Service Administration (ESSA). The changes occurred during Project Stormfury.

Project STORMFURY was an ambitious experimental program of research on hurricane modification carried out between 1962 and 1983. The proposed modification technique involved artificial stimulation of convection outside the eyewall through seeding with silver iodide. The invigorated convection, it was argued, would compete with the original eyewall, lead to reformation of the eyewall at larger radius, and thus, through partial conservation of angular momentum, produce a decrease in the strongest winds.

Modification was attempted in four hurricanes on eight different days. On four of these days, the winds decreased by between 10 and 30%, The lack of response on the other days was interpreted to be the result of faulty execution of the seeding or of poorly selected subjects.

These promising results came into question in the mid-1980s because observations in unmodified hurricanes indicated:

That cloud seeding had little prospect of success because hurricanes contained too much natural ice and too little supercooled water.

That the positive results inferred from the seeding experiments in the 1960s stemmed from inability to discriminate between the expected results of human intervention and the natural behavior of hurricanes.1


Reference
1 Willoughby, H. E., D. P. Jorgensen, R. A. Black, and S. L. Rosenthal, 1985: Project STORMFURY, A Scientific Chronicle, 1962-1983, Bull. Amer. Meteor. Soc., 66, 505-514.
2 https://www.aoml.noaa.gov/hrd/Landsea/kieper-landsea-beven-bams-2016.pdf
https://www.aoml.noaa.gov/hrd/hrd_sub/sfury.html