Local officials in Kerrville, an area hit hard by last week's floods, went door to door shortly after midnight on Sunday to warn residents about the risks

Just over a week after deadly flash floods swept through Texas Hill Country, the region may once again face a life-threatening deluge as slow-moving thunderstorms bring heavy rain, flash flooding, and rapid river rises to parts of central Texas Sunday.

The Guadalupe River has risen to catastrophic levels in the same area three times in the past century, impacting camps and campers each time.

Flash flooding is common enough around the crescent-shaped region from Dallas through the Hill Country, the area earned the nickname "Flash Flood Alley."

A "worst case scenario" of meteorological events contributed to the extreme flash flooding event that killed dozens of people in the region, according to experts.

Without a modern flood warning system, emergency officials monitor four sensors along the Guadalupe River – including one that was knocked out in the flood.

Maps show how heavy rainfall and rocky terrain helped create the devastating Texas floods that have killed more than 120 people.

People awoke from water rushing around them during the early morning hours of July 4, all along the Guadalupe River in the Texas Hill Country. Residents were seemingly caught off guard, but warnings had been issued days and hours before floodwaters began carrying away homes,

Rain rushing to the Guadalupe took it from a depth of less than 8 feet to 37.5 feet, a deluge with as much volume as an aircraft carrier over five minutes.