Floodwaters trapped people in their homes and cars Tuesday in a mountain village that is a popular summer retreat in southern New Mexico as monsoon rains triggered flash flooding and an entire house was swept downstream.

In the early hours of July 4, the only sound many of the vacationers along the banks of the Guadalupe River would have heard was pounding rain and thunder. They didn’t get any official warning of the rapidly rising waters that ultimately proved deadly to dozens of people swept away in central Texas flash floods.