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

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.

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 owner of a local RV park walked FOX 4 through the horrifying sequence of events that took place last week, throwing the future of their business into question.

In just 48 hours, Canyon Lake jumped nearly 10 feet, climbing from 881.33 feet on Saturday, July 5, to 888.57 feet by Monday, July 7, according to Water Data for Texas. That 7.24-foot rise marks one of the sharpest short-term increases in recent years and reflects the scale of the rainfall event.

The flood watch, in effect until 7 p.m. Sunday, applies to Bexar, Blanco, Burnet, Gillespie, Hays, Kerr, Llano, Travis and Williamson counties.

While local and state officials in Texas have said they were caught off guard by the severity of the flooding, the region is prone to extreme flooding, Marshall Shepherd, director of the Atmospheric Sciences Program at the University of Georgia and former president of the American Meteorological Society, told ABC News.