CNRFC - Ensemble Products

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NAPA RIVER - SAINT HELENA (SHEC1)

Latitude: 38.51º N	Longitude: 122.45º W	Elevation: 195 Feet
Location: Napa County in California		Bulletin Group: Russian Napa		River Group: Russian Napa

Issuance Time:

Jun 22, 2025 at 11:01 AM PDT

Action/Monitor: 16.0 Feet

Minor Flood: 18.0 Feet

Moderate Flood: 20.0 Feet

Major Flood: 22.0 Feet

Please Note:

Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.

Threshold Exceedance Plot Product Information

CSV Ensemble Files (Data in kcfs): Forecast Group | SHEC1

Select Threshold to Use: Threshold Value: Threshold Label:

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		Official Forecast (Deterministic)

		Prob. of Threshold Exceedance
		Model Traces

What information is considered in this forecast?

Verification / Historical Plots
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Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
24.0 Feet	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 40s to upper 50s. West winds up to 5 mph.

Monday: Sunny. Highs in the lower 70s to mid 80s. Southwest winds 5 to 15 mph.

Monday Night: Partly cloudy. Patchy fog after midnight. Lows in the upper 40s to mid 50s. Southwest winds 5 to 15 mph.

Tuesday: Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the upper 60s to lower 80s. Southwest winds 5 to 15 mph.

Tuesday Night: Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the upper 40s to mid 50s. Southwest winds 5 to 15 mph.

Wednesday: Mostly cloudy in the morning then becoming sunny. Highs in the lower 70s to mid 80s.

Wednesday Night through Saturday: Mostly clear. Lows in the 40s to upper 50s. Highs in the 70s to 80s.

Saturday Night: Mostly clear except patchy fog. Lows in the 40s to upper 50s.

Sunday: Partly cloudy in the morning then becoming sunny. Highs in the 70s to 80s.

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