Potent, slow-moving storms over central Texas have begun to trigger flooding in areas already hard-hit by the state. Forecasters with the National Weather Service extended some riverside flood watches and warnings, with some advisories lasting through Thursday.

The White House rebuked critics for raising questions about the administration’s efforts to shrink federal agencies that deal with disaster preparedness and response.

She called what happened a “once in a generation national disaster” and urged “everyone in the area to remain vigilant, listen to all warnings and