Idea was discussed during Eisenhower era.
Yes, I was a kid in the 50s and they were discussing seeding hurricanes while they were still over water to make them use up their rain before they hit land.
On August 24, 1995, there were five (5) named storms in the Atlantic and Caribbean Basin which were over Cat. 3 — Jerry, Iris, Humberto, Karen & Luis. Luis was a Cat. 5 approaching the US Virgin Islands. This is when the Clinton Administration, and more specifically NOAA, was taking the approach of finding a solution to curtailing or dissipating these hurricanes.