National Weather Service United States Department of Commerce

Heavy Rain and Flash Flooding Concerns in California; Heavy Snow in the Sierra

An atmospheric river will bring heavy rainfall to lower elevations of California this week, and heavy snow to the Sierra Nevada mountains. Flash flooding, some of which may be locally considerable, will be a concern on the western foothills of the Sierra Nevada mountains through Tuesday. Landslides, rockfalls and mudslides are possible in the Southern California mountains. Read More >

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Important Disclaimer

The following graphics are experimental and not an official forecast product. The graphics were created to display diagnostics for the MRMS radar-only rainfall estimate product. The plots were developed as a tool for assessing potential biases in data that has not been adjusted using rain gauges.


Experimental products may not always update in a timely manner and may be discontinued at a future date. Experimental products may not always reflect accurate, quality controlled information and should be used with caution.

 

Image showing bias correction factor for the MRMS Q3 radar-only rainfall estimate compared to RFC gauge bias-corrected estimates.

Image showing difference between the MRMS Q3 radar-only rainfall estimate and the RFC gauge bias-corrected estimate, in inches.

Image showing bias correction factor for the MRMS Q3 radar-only rainfall estimate compared to RFC gauge bias-corrected estimates.

Image showing difference between the MRMS Q3 radar-only rainfall estimate and the RFC gauge bias-corrected estimate, in inches.