[dr1s]

Clouds can also just evaporate if the temperature is hot enough, like in a desert. Regardless I think it's better to use this kind of method for cloud-seeding then the pumping chemicals into the air, which seems to be the common method.

[rjmunro]

If a cloud "evaporates", the water is still in the air and will condense into clouds and rain at some point somewhere else. It can't just disappear.