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.

New flood warnings have been issued along the Guadalupe River in Texas less than two weeks after flooding killed more than 100 people.

About four miles downriver from Acevedo's team in Kerrville, Roberto Marquez was found working on a memorial. "I've made 148. But I believe we need to make another 18," Marquez said. The artist is handmaking crosses to honor those lost across Texas.

In what experts call "Flash Flood Alley," the terrain reacts quickly to rainfall steep slopes, rocky ground, and narrow riverbeds leave little time for warning.

Flash floods are occurring across the U.S., from Texas to New Jersey. Here's what you should know as risks escalate.

A large percentage of people still unaccounted for were probably visiting the area, Kerr County Judge Rob Kelly said.

Plans to develop a flood monitoring system in the Texas county hit hardest by deadly floods were scheduled to begin only a few weeks later.

For the third straight day, thunderstorms have posed what meteorologists call life-threatening conditions in the Hill Country, where flooding earlier this month killed at least 131 people.