A new report has found that officials in Kerr County, Texas, did not use technology that would have sent lifesaving emergency messages to everyone in the vicinity of the Guadalupe River as it flood 4.

This part of Texas Hill Country is known for flash floods. Why were so many people caught off guard when the river turned violent?

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."

Another potentially life-threatening flooding event took place across Central Texas on Sunday morning, with torrential rain sending rivers and streams above their banks, forcing officials to stop search efforts along the Guadalupe River that had been underway since a catastrophic and deadly flash flooding event over the Fourth of July holiday.

Betty Matteson’s four children, nine grandchildren and numerous great-grandchildren have squeezed into her Texas Hill Country home countless times since 1968.

Here's what to know about the deadly flooding, the colossal weather system that drove it and ongoing efforts to identify victims.