I witness it everyday in my home state in Australia.

https://www.smh.com.au/world/thai-rain-making-comes-to-qld-20100808-11q5f.html

"The climate and geology of Queensland drought area is very similar to some parts of Thailand. So we're quite sure this technology can be used effectively in Queensland," Soothiporn told AAP.

The technique largely relies on cloud seeding generally undertaken using chemicals that promote the formation of water droplets within the cloud formations.

The chemical cloud seeding in turn creates clouds with differing temperatures at different altitudes.

There are several stages in the process, with sodium chloride used in the final stage to trigger rain.

"If that kind of cloud is set up in a very good condition, then the cloud will condense into water and the rain will begin falling," Soothiporn said.

In Thailand, the cloud-seeding method has been applied in the largely drought-affected north-east of the country as well as boosting water volume in dams and reservoirs and aiding reforestation programs.

Quick web search for: American cloud seeding

http://www.nawmc.org/faq/

North American Weather Modification Council

For what purposes is weather modification practiced?

Weather modification, commonly referred to as cloud seeding, is currently used to increase precipitation from clouds, reduce hail from thunderstorms, and eliminate fogs that reduce visibility, usually at busy airports.

What are clouds seeded with?

Clouds can be seeded with a number of different types of agents: silver iodide, liquid propane, dry ice (solid carbon dioxide), and various salt compounds.

What methods are used to deliver seeding material to suitable clouds?

Seeding is typically done either by specially-equipped aircraft or via ground-based generators at higher elevations in mountainous areas.