There are more than 100 emergency personnel on the ground working to reunite families, the sheriff said. A large-scale search and rescue effort is ongoing.

A county sheriff in 2016 recalled how he pulled “kids out of trees” in summer camps as leaders debated a siren system for years.

Before heading to bed before the Fourth of July holiday, Christopher Flowers checked the weather while staying at a friend’s house along the Guadalupe River. Nothing in the forecast alarmed him. Hours later,