The National Weather Service has issued a flash flood warning for Montgomery County and surrounding areas until 8:15 p.m. Saturday.

Flood risk will be elevated into Saturday in mountain and high desert areas, the National Weather Service warns.

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 .”