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.

Eight-year-old girls at sleep-away camp, families crammed into recreational vehicles, local residents traveling to or from work. These are some of the victims.

The Texas Hill Country has been notorious for flash floods caused by the Guadalupe River. Here's why the area is called "Flash Flood Alley."

From jewelry to a heart-shaped summer camp sign, these are some of the objects found in the wake of this month's devastating floods.

New flood warnings have been issued along the Guadalupe River in Texas less than two weeks after flooding killed more than 100 people.

In what experts call "Flash Flood Alley," the terrain reacts quickly to rainfall steep slopes, rocky ground, and narrow riverbeds leave little time for warning.

At least 135 people died in the flood, the Texas Tribune reported. Among the dead were campers and counselors at Camp Mystic, a Christian girls summer camp on the Guadalupe River who were lost when a torrent of rain thrashed the region before sunrise.

Flash flooding is common enough around the crescent-shaped region from Dallas through the Hill Country, the area earned the nickname "Flash Flood Alley."

Rainfall amounts of 1-2 inches and isolated amounts of 3-5 inches are possible, the National Weather Service said.