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Flash Flood Guidance
About Flash Flood Guidance:
Flash Flood Guidance is an estimate of the amount of rainfall required over a given area
during a given duration to cause small streams to flood. These estimates are based on the current
soil moisture and stream flow conditions for the area, usually one county. Flash Flood Guidance is
routinely issued by National Weather Service (NWS) River Forecast Centers, and is used by NWS Weather
Forecast Offices when issuing Flash Flood Watches and Warnings to the public. The Northeast River
Forecast Center calculates 1, 3, 6, 12 and 24-hour Flash Flood Guidance values daily.
Note: Less rainfall is required to produce flash flooding in urban areas.
Additional Flash Flood Guidance Graphics
Flash Flood Guidance Text Products
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