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- Dictionaryflash flood
noun
- 1. a sudden local flood, typically due to heavy rain.
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noun
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Rapid flooding of low-lying areas, often caused by heavy rain associated with a severe thunderstorm, hurricane, tropical storm, or melt water from ice or snow
A flash flood is a rapid flooding of low-lying areas: washes, rivers, dry lakes and depressions. It may be caused by heavy rain associated with a severe thunderstorm, hurricane, or tropical storm, or by meltwater from ice or snow flowing over ice sheets or snowfields. Flash floods may also occur after the collapse of a natural ice or debris dam, or a human structure such as a man-made dam, as occu... Wikipedia