This part of Texas Hill Country is known for flash floods. Why were so many people caught off guard when the river turned violent?

President Donald Trump toured the devastation left by flash flooding in central Texas amid growing questions about how local officials responded to the crisis as well as questions about the federal response -- including the fate of the Federal Emergency Management Agency -- that he has so far avoided.

Scholars and designers of early warning systems say that there are still huge gaps in our ability to predict flash floods and warn those at risk.

Over 100 people have died in the Texas flooding as of Tuesday. Here are answers to commonly asked questions from USA TODAY readers.

More than 170 people are still believed to be missing a week after the forceful floodwater hit over the July Fourth weekend.

Officials at the Comfort Volunteer Fire Department triggered a flood warning siren last week when the Guadalupe River began to swell.

Officials in Kerr County, Texas — where 27 campers and counselors at a Christian summer camp were killed in catastrophic flooding — had discussed installing a flood warning system

When the precipitation intensified in the early morning hours Friday, many people failed to receive or respond to flood warnings at riverside campsites known to be in the floodplain.