Sisters Blair Harber, 13, and Brooke Harber, 11, were killed, along with their grandparents, when surging floodwaters ripped through the community. Their parents were staying in a different home at Casa Bonita and survived, according to the family's GoFundMe.

On Wednesday, hundreds prayed, wept, and held one another at a prayer service, among the first of many somber gatherings to come in the weeks ahead.

More than 111 people have died across six counties after flash flooding from heavy rain began affecting the state last week.

After catastrophic floods hit Texas' Hill Country, many are asking about preparations for the next big flood. Jason Allen spoke to Jay Banner, climatologist at University of Texas at Austin, on the banks of the Guadalupe River.

Flash floods surged through in the middle of the night, but many local officials appeared unaware of the unfolding catastrophe, initially leaving people near the river on their own.

Q: Is it true that if President Donald Trump hadn’t defunded the National Weather Service, the death toll in the Texas flooding would have been far lower or nonexistent? A: The Trump administration did not defund the NWS but did reduce the staff by 600 people.

Flash floods in Texas have killed at least 107 people over the Fourth of July weekend, with more than 160 still missing.

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