National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

Flash Flood Guidance

Flash flood guidance is defined as the average inches of rainfall for a given duration required to produce flash flooding in small streams.


CNRFC Flash Flood Guidance- Interactive Map Interface

Gridded flash flood guidance is available as overlays on an interactive map interface. Data is updated daily at 3:00 AM PST (4:00 AM PDT). Also, KML files are available for download and use in Google™ Earth.

    Flash Flood Guidance - Interactive Map Interface

Graphical Version

These graphics are updated daily at approximately 3:15 AM PST (4:15 AM PDT).

RFC Area
Time Duration
Entire CNRFC Area