What does the flash in flash flood watch mean?

According to the National Weather Service, issuing a flash flood watch indicates that the conditions are favorable for a flash flood. It does not guarantee that the area under the watch will endure a flash flood, but provides a heads up for area residents or visitors. What is a flash flood warning? read more

Flash in the word flash flooding is a word that means flooding will occur rapidly. This can take place in a matter of a few hours to that of only minutes. Such flooding is probably the worst to go through for it is so fast that one has little time to get ready if any real warning at all. read more

Best Answer: it means the flood happened in a very short period of time (less than six hours) as opposed to it raining for many days causing the flood. read more