Flash floods in Texas have killed at more than 80 people, many of them children.Heavy rains fell quickly in the predawn hours Friday in the Texas Hill Country, causing the Guadalupe River to rise 26 feet in just 45 minutes.

Coast Guard Petty Officer Scott Ruskan rescued nearly 200 people including children from Camp Mystic during catastrophic Texas floods that have claimed 68 lives in Kerr County.

After floods left more than 80 dead in Texas, questions are emerging about how to provide better warnings in a region known as “flash flood alley.”