The danger has extended to Travis, Williamson and Burnet counties, where very dangerous flash flooding is ongoing Saturday morning. Between 5 and 12 inches of rainfall has fallen there, the weather service said, calling it a "Particularly Dangerous Situation with life-threatening flash flooding."

Texas Governor Greg Abbott said he had asked President Donald Trump to sign a disaster declaration, which would unlock federal aid for those affected.

Dozens of people have died after heavy rain pounded Kerr County, Texas, early Friday, leading to "catastrophic" flooding, the sheriff said.