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Flash flood guidance systems are specialized forecasting and early-warning systems for flash floods. Flash floods occur on short time and spatial scales, which makes them challenging to predict using traditional flood forecasting methods, such as monitoring river water levels. Flash floods’ very quick formation also makes them more deadly than any other type of flood. Flash flood guidance systems are designed to provide forecasters with data that allows them to predict a potential flash flood (usually a few hours before it hits), and produce an early warning to increase preparedness.