Two days before the waters of the Guadalupe River swelled into a deadly and devastating Fourth of July flood in Kerr County, Texas, engineers with a California-based company called Rainmaker took off in an airplane about 100 miles away and dispersed 70 grams of silver iodide into a cloud. Their goal? To make it rain over Texas — part of a weather modification practice known as cloud seeding, which uses chemical compounds to augment water droplets inside clouds, making the drops large enough and heavy enough to fall to the ground. But in the hours after the flood swept through the greater Kerrville area and killed at least 135 people, including three dozen children, conspiracy theories began swirling among a small but vocal group of fringe figures.

Other cloud seeding news:

• The Colorado Sun (Denver): Has cloud seeding triggered extreme flooding in Colorado?
• Forbes: The top 6 weather conspiracy theories debunked​