This map shows where camps along the Guadalupe River were impacted by the July 4 flood. Meteorologists Pat Cavlin and Kim Castro detail how it all happened.

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."

Along the Guadalupe River, a 60-room inn and nearby homes were quickly filling with water. Confusion, desperation and heroism ensued.

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.

Explore three decades of Guadalupe River Basin flood data by county with our interactive, searchable database.

Flash floods surged through in the middle of the night, but many local officials appeared unaware of the unfolding catastrophe, initially leaving people near the river on their own.

A Kerrville-area river authority executed a contract for a flood warning system that would have been used to help with emergency response, local officials said.

Follow along for developments on the July Fourth floods along the Guadalupe River in Kerr County and Central Texas.