The devastation in Texas Hill Country isn't the first time Americans have mourned the victims of deadly floodwaters.

Worst case scenario: “The worst would be a debris flow that’s several feet deep, that closes roads in the area, ... There's a long history of mudslides in the area, ...

Powerful storm causes mudslides in California, threatens outbreak of tornadoes and wildfires across US this week ...

A powerful storm dropping drenching rain on flood-prone Southern California is raising concern among forecasters that it could produce a dangerous, widespread outbreak of tornadoes, damaging winds ...