Two weeks after deadly floods swept through Texas, officials dropped the number of still-missing people in the hardest-hit area to three — down from nearly 160 in the days following the July Fourth weekend floods.

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.