According to the National Weather Service, flash floods claim more victims every year than nearly any other severe weather event. Most of those fatalities occur when people try to drive through flood waters (hence the NWS slogan "Turn around; don't drown) and an overwhelming majority of those drivers are males.
Many people do not know that water over a car's hubcaps can sweep it away. Even big pickups and SUVs are vulnerable to flood waters.
Most of the time, the local Weather Service office will issue a flash flood watch if they consider it likely these floods may occur, so residents can be prepared.