Can you divide the effects from each other?

So if project A does something, what if it influences project B?

The signal is so weak, anyway, that's it's practically impossible to decide cause and affect. I think it's mentioned in that article that they start with an area that's already got some rain or snow clouds and try to boost their output by a few points and hope that a trend emerges over time.

Also, they do these on a small local scale, like spraying this morning to boost the rain this afternoon.

You need a permit in Colorado and the projects seem related to snow generation, which makes sense given that skiing is a huge industry for the state.

> Colorado, where most other weather modification programs are run

Are you sure? That claim doesn't appear in the linked article.

Here's the official list of projects in the US:

https://library.noaa.gov/Collections/Digital-Collections/Wea...