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."

Follow for live updates in the Texas flooding as the death toll rises to 120, as rescue operations start to shift to recovery phase

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

At least 120 people are dead and 173 are missing in central Texas after the Guadalupe River swelled early Friday, causing destructive flash flooding throughout Kerr County.Now, new before-and-after satellite images of several sites throughout Kerry County show the devastation caused by the floods as crews embark on a seventh day of search and rescue efforts.

More than 111 people have died across six counties after flash flooding from heavy rain began affecting the state last week.

The photos reveal the destruction of trees, vegetation and homes along the Guadalupe River near Hunt and Kerrville, Texas. The flooding occurred in Texas Hill Country in the central part of the state, which is also called “Flash Flood Alley.”

The heavy rain that turned a river in Texas into a raging wall of water was fueled by unique atmospheric conditions, according to meteorologists and climate scientists.

A swift-moving flood that swept through the Hill Country of Texas on Friday, killing at least 79 people and leaving many more missing, was a flash flood.

With more than 170 still missing, communities must reconcile how to pick up the pieces around a waterway that remains both a wellspring and a looming menace.

Two days before flash floods on the Guadalupe River in Texas killed dozens of campers at a Christian girls summer camp, a state inspector approved operations, noting there was a written plan for responding to natural disasters.