Flash Flood Guidance

River Observations and Forecasts
Weather Observations and Forecasts
Water Supply
Climate and History
Seasonal Interest
Local Information

GRAPHICS DISPLAY GRIDDED FLASH FLOOD GUIDANCE - the amount of rainfall required to produce flooding within each 4km x 4km grid cell averaged across a basin.

LOCAL GRAPHICS TEMPORARILY UNAVAILABLE

1 Hr Flash Flood Guidance	3 Hr Flash Flood Guidance	6 Hr Flash Flood Guidance
Click any of the thumbnails above to view a slideshow About County Flash Flood Guidance: County flash flood guidance is a numerical estimate of the average rainfall (in inches) over a one, three, and six hour time duration, required to initiate flooding along small streams in the indicated county. These estimates are derived from averaging the gridded flash flood guidance over each county, and are based on current soil moisture conditions computed by the River Forecast Centers. In urban areas, less rainfall is required to produce flash flooding. Headwater guidance is the basin averaged rainfall required to produce flooding at a RFC basin outlet.