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.

Here's what to know about the deadly flooding, the colossal weather system that drove it and ongoing efforts to identify victims.

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

The same region of Texas that experienced catastrophic, deadly flooding over the Fourth of July weekend also experienced massive flooding in the past. A 1987 flood in Kerr County resulted in the death of 33 people,

Mr. Trump and Abbott promised to rebuild the devastated region, although the president recognized that what was lost can never be recovered.

Follow live updates on the Texas floods, where the death toll has surpassed 100, including Camp Mystic counselors and campers.

State and local officials in Texas have come under scrutiny over the lack of sirens in place to warn people of impending flash flooding.