Flash floods are floods that occur in small areas with water falling and rising quite rapidly., , Intense rainfall is a typical cause of flash floods. , , Flash flood guidance is defined as the amount of actual rainfall of a given duration that is just enough to cause bankfull flow at the outlet of the catchment., , Imminent Flash Flood Threat indicates that flash flood is happening now or is imminent., , Forecast Flash flood threat uses forecast mean areal precipitation., , Global Hydro Estimator accumulations are produced from 1-hour GHE rainfall input summed over the corresponding interval, , Flash flood risk products provide information to forecasters and disaster managers with the lead time up to 36 hours, , Bias is persistence error, not random error, , Flash flood threat products are not indicated to be forecast but indicate regions of potential concern that forecaster should review, , Melt product is an estimate of ablation due to melt process and is a direct output of the SNOW-17 model, .

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