No; it's not.
They can alter where the existing clouds form rain.
Increasing CO2 levels in the atmosphere and warming the entire globe makes the entire atmosphere hold more water.
Not one little tiny area they sprinkled some nucleation chemicals.
Again: you're well out of your element here.
Joe, you learn on the fly. Just like anyone else on the forum. And you're wrong often enough. Just like anyone else. I'm not saying you're wrong here, but you'd probably be more liked if you'd regularly show humility.