After hours of waiting and praying in the attic, the water stopped rising and the family was rescued. A first responder helped Matteson, wearing a navy and pink floral dress and quilted white jacket, into the back of a car. Her family survived. Their home was not so lucky.

The risk of the catastrophic flooding that struck Texas Hill Country as people slept on July 4 and left at least 120 dead was potentially underestimated by federal authorities, according to an ABC News analysis of Federal Emergency Management Agency data, satellite imagery and risk modeling.

KHOU 11 Meteorologist Pat Cavlin says it's impossible to determine exactly where the heaviest of rain will fall, but everyone in risky areas should stay aware.

A hydrologist explains why the region is known as Flash Flood Alley and how its geography and geology can lead to heavy downpours and sudden, destructive floods.

Would a flood scale like those used for hurricanes and tornadoes have prompted different actions by Texas officals and the public before July 4th flooding?

Federal regulators removed dozens of Camp Mystic buildings from a 100-year flood map as the camp looked to expand.

Camp Mystic successfully appealed to remove several structures from a FEMA flood zone, despite being located in a high-risk flood area in Texas Hill Country.