In a Slack chat, a National Weather Service forecaster tells emergency managers, meteorologists and news media that the agency is monitoring Kerr County, but so far there has been little rain. Within 40 minutes, two weather cells combine, creating a dramatically more dangerous situation. A flash flood warning goes out at 1:14 a.m.

Over 130 people have died after heavy rain pounded Kerr County, Texas, early Friday, leading to "catastrophic" flooding, the sheriff said.

Here's a chronology of chaotic rescue efforts as a flash flood chewed through the Texas Hill Country before dawn July 4 based on first responder