Phones buzzed across Texas just before 8 p.m. Wednesday with a high-priority emergency alert. But it wasn't about flooding, a storm, or a missing child. It was about a five-day-old shooting at an ICE detention center hundreds of miles away.

The Texas Hill Country floods brought questions about the alert systems in place for emergencies. But data shows some Texans may be suffering from “warning fatigue."

Rescue efforts include more than 2,100 responders on the ground, private helicopters, drones, boats and cadaver-detecting dogs.