The military tried it in Vietnam/Laos to flood the Ho Chi Minh Trail. Only minor successes. There was a whole Senate hearing/report on it about 1973 (probably by Sen. Proxmire (D-Wisc) whose wig was on too tight).
No big deal. Just Google “Senate Foreign Relations Committee and Weather Modification” and see what pops up.
A lot can happen in fifty years.
Businesses develop,
http://www.weathermodification.com/
Businesses really develop,
http://www.investopedia.com/articles/optioninvestor/05/052505.asp
Technocrats emerge,
https://www.technologyreview.com/s/603349/geoengineering-gets-green-light-from-federal-scientists/
Congress puts on their make-up,
https://www.gpo.gov/fdsys/pkg/CHRG-111hhrg53007/html/CHRG-111hhrg53007.htm
and voila! Thirteen Agencies, One Vision: Empower the Nation with Global Change Science
https://downloads.globalchange.gov/strategic-plan/2016/usgcrp-strategic-plan-2016.pdf
Or just give a quick look at various State and Federal rules for modifying weather
https://climateviewer.com/2016/05/14/weather-modification-laws-in-the-united-states-of-america/
Just saying, weather modification has come a long way and just because them boys and girls pushing climate change aren’t sharing the whole story with US,
http://www.google.com/patents/US20120117003
don’t necessarily mean it ain’t so.