Flash Flood Guidance

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Select the product:	1 Hour Flash Flood Guidance 3 Hour Flash Flood Guidance 6 Hour Flash Flood Guidance 12 Hour Flash Flood Guidance 24 Hour Flash Flood Guidance
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View text versions of the state flash flood guidance values:	Alabama Arkansas Colorado Connecticut Delaware Florida Georgia Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Pennsylvania Puerto Rico Rhode Island South Carolina South Dakota Tennessee Texas Vermont Virginia West Virginia Wisconsin Wyoming
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About Flash Flood Guidance:

National Weather Service (NWS) River Forecast Centers routinely issue Flash Flood Guidance throughout the day for every county in their area. The river forecast centers determine 1- 3- and 6-hour flash flood guidance values for all counties, and 12- and 24-hour values for parts of the eastern United States. The NWS Weather Forecast Offices use this guidance when issuing flash flood watches and warnings to the public.

Flash Flood Guidance estimates the average number of inches of rainfall for given durations required to produce flash flooding in the indicated county. These estimates are based on current soil moisture conditions. Note, in urban areas, less rainfall is required to produce flash flooding.