*** IMPORTANT *** Week of June 16 - Website Data Outage - Due to a major computer upgrade the week of June 16, nearly all data on the CNRFC web site will not be updated. We anticipate the down time to be approximately 4 days. The latest deterministic hydrologic forecasts for official forecast points will continue to be available at the National Water Prediction Service during this time.
Please Note: 1) Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.
2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.
Historical High Stage/Flow Events (Period of Record - Jun 2000 to Present)* - Ranked by Flow
2006*
18,300
23.61
Dec 31, 2005
1986
16,900***
18.52
Feb 17, 1986
1997
13,100
17.70
Jan 1, 1997
1956
12,600
15.17
Dec 22, 1955
1963
12,300
15.30
Jan 31, 1963
* Discharge affected by regulation or diversion
** Most recent continuous record back to Jun 2000 with segmented periods back to Oct 1929
*** Flood of record at old gage site
Disastrous Flooding. Widespread flooding across upper Napa Valley with travel essentially impossible. The peak water level during the flood of 12/31/2005 measured 23.6 feet.
22.0 Feet
Major Flood Stage. Major flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
20.0 Feet
Moderate Flood Stage. Moderate flooding of the lower portions of Silverado Trail along the reach. Inundation of low lying residential areas along the east river bank in the vicinity of Pope Street Bridge. Secondary and many primary roads inundated; most major cross roads inundated and unsafe to pass.
18.0 Feet
Minor Flood Stage. Minor flooding of low lying agricultural areas along river begins. Low lying rural residential areas immediately adjacent to the river and some secondary roads affected.
16.0 Feet
Monitor Stage. WFO Monterey may issue a Flood Watch-based products to cover Napa Valley regional flood potential at this stage.
Official 7 Day National Weather Service Forecast (CAZ506)
rest of Tonight: Mostly clear. Lows in the upper 40s to mid 50s. West winds 10 to 20 mph.
Thursday: Sunny, breezy. Highs in the upper 60s to lower 80s. West winds 10 to 20 mph increasing to 20 to 30 mph in the afternoon.
Thursday Night: Mostly clear. Breezy. Lows in the mid 40s to lower 50s. West winds 20 to 30 mph with gusts to around 45 mph.
Friday: Partly cloudy in the morning then becoming sunny. Breezy. Highs in the 60s to 70s. Northwest winds 10 to 20 mph increasing to west 20 to 30 mph in the afternoon.
Friday Night: Mostly clear. Breezy. Lows in the mid 40s to lower 50s. Northwest winds 20 to 30 mph with gusts to around 45 mph.
Saturday: Sunny. Highs in the upper 60s to lower 80s.
Saturday Night through Wednesday: Mostly clear. Lows in the upper 40s to mid 50s. Highs in the lower 70s to mid 80s.
Product Disclaimer
This river graphic is not intended to serve as a
substitute for official flood watches, warnings, advisories, or statements
issued by the NWS San Francisco Bay Area-Monterey Weather Forecast Office. Observations
are preliminary and subject to change. River levels identified as "forecast"
should be consistent with those contained in official NWS products.
River levels identified as "guidance" have significant uncertainty
due to future weather or reservoir regulation and are provided for planning
purposes only.
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