Two tropical storms have led to deadly inland flooding in the United States already this season, underscoring how dangerous water can be.

Barry dissipated as a tropical depression four days before its remnants helped trigger the deadly Texas flash flood. And it's far from the only example of deadly inland flooding we've seen.

Texas Hill Country, where much of the flooding took place this time, is often referred to as “flash flood alley.” It's home to steep terrain and a lack of vegetation that creates a perfect storm for waters to rise quickly.