Cloud seeding is a weather modification concept that attempts to draw more rain or snow out of a cloud than would occur naturally. In a cloud, so-called condensation nuclei are teeny, tiny particles in the air the moisture can grab onto. Aircraft fly through existing clouds and inject the tiny particles, like silver iodide, with the goal of creating more water or ice droplets.
It's exceedingly unlikely the cloud-seeding efforts would have produced more rain than was going to fall naturally. Natural tiny particles, like dust and dirt, typically serve as the driving force for clouds to condense and let go of their moisture. Silver iodide can theoretically serve the same purpose.
It's incredibly difficult to determine what if any impact cloud seeding has on precipitation. Experimentation and attempts to quantify its effectiveness have been ongoing, but with little evidence of success.
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