Flash flood watch

A flash flood watch (SAME code: FFA; also referred as a "green box" by meteorologists) is severe weather watch product of the National Weather Service that is issued when conditions are favorable for flash flooding in flood-prone areas, usually when grounds are already saturated from recent rains, or when upcoming rains will have the potential to cause a flash flood.

[1] Countries such as Australia also issue similarly worded warnings.

[2] Below is an example issued by the National Weather Service in Mount Holly, New Jersey.

Source:[3] If a flash flood watch is likely to lead to a major flash flood disaster, then enhanced wording with the words This is a particularly dangerous situation (PDS) can be added to the watch; this is occasionally issued.

Below is an example issued by the National Weather Service in Memphis, Tennessee.