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.

In what experts call "Flash Flood Alley," the terrain reacts quickly to rainfall steep slopes, rocky ground, and narrow riverbeds leave little time for warning.

These maps and charts show the scale and intensity of the Hill Country floods and highlight Camp Mystic’s proximity to high-risk flood zones.

Dick Eastland, the Camp Mystic owner who pushed for flood alerts on the Guadalupe River, was killed in last week’s deadly surge.

As a climate scientist who calls Texas home, I can tell you that the Hill Country of Texas is no stranger to flooding. Meteorologists often refer to it as “Flash Flood Alley” because of its steep terrain, shallow soils, and its history of sudden and intense rainfall.

The Kerr County sheriff, Kerrville mayor and Kerrville police chief spoke to reporters Wednesday morning with the latest information on the deadly flash flooding in the Texas Hill Country.

Now, days later, four young campers and one beloved counselor are still missing. Search and rescue teams have not stopped. At least 150 people are known to be missing in Kerr County as a result of the flooding in Central Texas,

Fox News correspondent Christina Coleman has the latest on the deadly central Texas floods that have killed 120 and resulted in more than 170 missing on ‘The Story.’