The flood watch, in effect until 7 p.m. Sunday, applies to Bexar, Blanco, Burnet, Gillespie, Hays, Kerr, Llano, Travis and Williamson counties.

"It's not community to community. It's a national system," Sen. Maria Cantwell said on "Face the Nation with Margaret Brennan."

Experts said warnings issued in the run-up to this weekend’s flooding were as timely and accurate as possible, but questions about whether the alerts reached people most at risk remain.

At 9:58 p.m. on Saturday, the National Weather Service released a flash flood warning in effect until Sunday at 1 a.m. for Jackson and Cass counties.

The National Weather Service in Pueblo issued a flash flood warning Saturday evening for Costilla and Huerfano counties in southern Colorado. The impacted area is about 35 miles north of the New Mexico state line.

Heavy rain caused flooding issues in Ames and rotation was observed in clouds around the Iowa Speedway in Newton as the area was under a tornado warning. All watches and warnings have expired for central Iowa, but major flooding continues in some eastern Iowa communities after heavy rain and possible tornadoes.

The flood watch, in effect until 7 p.m. Sunday, applies to Bexar, Blanco, Burnet, Gillespie, Hays, Kerr, Llano, Travis and Williamson counties.