Even when floods can be anticipated, communicating their severity to the public is a tall order. Because flash floods are very localized, even neighborhood-level warnings may seem like false alarms to some residents, leading to what the journalist Zoë Schlanger has dubbed “ alert fatigue .”

The NWS Fort Worth TX released an updated flash flood warning at 9:09 p.m. on Saturday in effect until Sunday at midnight. The warning is for Collin, Dallas and Denton counties.