What can happen during flash floods?

Flash floods are characterized by their sudden onset, often occurring within minutes to hours following intense rainfall or other events such as dam breaks or rapid snowmelt. The rapid nature of flash floods means that they can catch individuals off guard, leading to dangerous situations where water levels can rise quickly and become life-threatening. This ability to develop quickly is a critical aspect of flash floods, serving as a central reason why those in flood-prone areas must remain vigilant and aware of changing weather conditions.

Other options present misconceptions. Generally, flash floods are characterized by their short duration, often not lasting for several days as implied in one option. Additionally, while warnings can be issued, flash floods can occur with little or no advance notice, contradicting the idea that they always provide warnings. Lastly, while mountainous areas are indeed vulnerable to flash floods due to steep terrains that direct water flow, these floods can occur in various landscapes, not limited to just high-altitude regions.