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.

Also: San Antonio mourned the victims in a Travis Park vigil; UTSA said one of its teachers died in the Guadalupe River flood; Kerrville officials said a privately owned drone collided with a helicopter conducting search and rescue operations.

Local officials have faced angry questions about whether they could have warned people of dangerous flash floods in Texas Hill Country sooner. Rescue teams from neighboring states and Mexico have joined local efforts to search for survivors,

Texas has confirmed 109 deaths as a result of the storms that dangerously raised the Guadalupe River 26 feet in under an hour. On Tuesday, first responders and volunteers fanned out on foot, horseback and boats.

Texas lawmakers failed to pass a bill in the regular legislative session that would have improved local governments’ emergency communications infrastructure.

Four days after the devastating flash floods in Texas Hill Country, local officials and law enforcement in Kerr County couldn’t provide basic details of the emergency response.

More than an entire summer's worth of rain fell in some spots in just a few hours, quickly overwhelmed dry soils and created significant flash flooding.