A flash flood prediction algorithm (FFPA) has been developed to provide automated predictions and alerts for potential hazardous flooding conditions. The system utilizes gridded quantitative precipitation estimates (QPE) derived from radar data, quantitative precipitation forecasts (QPF), hydrologic basin data, and flash flood guidance as input data. Those data are processed in five minute intervals, after which the algorithm generates output data including ESRI Shapefiles, database tabular data, color-coded basin images, and alerts for basins that approach or exceed the flash flood guidance data. FFPA has been designed to be easily configured for any geographical area and a number of diverse meteorological radar types. The system has been configured and installed for several domestic and international clients during the past few years. A technical description of the system and case data will be presented.