Hours before a massive wall of floodwater barreled down a river in the heart of Texas Hill Country before sunrise on Friday, forecasters with the National Weather Service warned people that dangerous conditions were brewing.

At least 67 people are dead after heavy rain lashed Texas, leading to "catastrophic" flooding. Texas Gov. Greg Abbott said emergency responders remained in a search and rescue posture, hours after the flooding along the Guadalupe River inundated nearby areas.