The only somewhat successful and perhaps morally questionable weather control I am aware of takes place in the Sierras of CA/NV each winter.
Cloud seeding stations are permanent fixtures. See “DRI” of Reno.
They increase rain/snow locally (Got to keep the Skiers happy!) which also reduces snow/rain further east.
I seem to recall Utah objecting to this scheme?
More precipitation further east would add water to The Great Salt Lake and Colorado head waters.
There probably are similar operations in other areas and countries.
“They increase rain/snow locally (Got to keep the Skiers happy!) which also reduces snow/rain further east.”
Rain and snow in the high country is how the west gets its water. Win-win.