A Flash Flood is a rapid and extreme flow of high water into a normally dry area, or a rapid water level rise in a stream or creek above an expected flood level, beginning within six hours of the causative event (e.g., intense rainfall, dam failure, ice jam). Please note, the actual time threshold may vary in different parts of the country.
Ongoing flooding can intensify to flash flooding in cases where intense rainfall results in a rapid surge of rising flood waters.
