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.

U.S. President Donald Trump is heading to central Texas on Friday to survey damage from the July 4 flash flood that killed at least 120 people and left dozens more missing.

At least 150 people are known to be missing in Kerr County as a result of the flooding in central Texas, according to officials.

"The first lady and I are here in Texas to express the love and support and the anguish of our entire nation in the aftermath of this really horrific and deadly flood," Trump said as he spoke at a roundtable event with first responders and local officials.

US President Donald Trump reassured residents of Kerrville, Texas, that the government would help rebuild after floods hit the central part of the state last week, killing 120 people.

With the nation’s attention focused on the need for the federal government to effectively respond to disasters, White House officials are emphasizing instead their plans to overhaul the agency, sayin...