Texas Gov. Greg Abbott on Monday described the flash flooding that had killed at least three people in his state as "a relentless wall of water that mowed down huge trees like they were grass."
Abbott declared states of disaster in 24 counties and flew over the area south of Austin to assess the damage caused by tornadoes, heavy rainfall, thunderstorms and flooding that forced evacuations and rooftop rescues and left thousands of residents without electrical power.
"This is the biggest flood this area of Texas has ever seen," Abbott said.