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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:

May 14, 2024 at 9:28 AM PDT

Monitor Stage: 16.0 Feet

Flood Stage: 18.0 Feet

Please Note:

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

Short-Range Peak Exceedance Plot Product Info. Plot Type:

CSV Ensemble File Download (Data in feet): SHEC1

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		Official Forecast (Deterministic)
		Ensemble Mean
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	Hourly Probabilities
		0-5% chance
		5-25% chance
		25-40% chance
		40-60% chance

What information is considered in this forecast?

Verification / Historical Plots
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Impacts - E19 Information
16.0 Feet	Monitor Stage. WFO Monterey/San Francisco Bay Area may issue a Flood Watch to cover Napa Valley region flood potential at this stage.
18.0 Feet	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.
20.0 Feet	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.
22.0 Feet	Major flooding throughout the upper Napa Valley with most roads inundated, making travel extremely difficult and unsafe.
24.0 Feet	Disastrous flooding. Widespread flooding across the upper Napa Valley with travel essentially impossible. The peak water level during the flood of 12/31/2005 measured 23.6 feet.

Official 7 Day National Weather Service Forecast (CAZ506)

Today: Mostly cloudy in the morning then becoming sunny. Highs in the upper 60s to lower 80s. Southwest winds 5 to 10 mph increasing to 10 to 20 mph in the afternoon.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 40s to mid 50s. Southwest winds 10 to 20 mph.

Thursday: Mostly cloudy in the morning then becoming partly cloudy. Highs in the mid 60s to lower 80s. Southwest winds 5 to 15 mph.

Thursday Night: Mostly clear in the evening then becoming mostly cloudy. Lows in the upper 40s to mid 50s. Southwest winds 10 to 20 mph.

Friday: Mostly cloudy in the morning then becoming sunny. Highs in the upper 60s to lower 80s. Southwest winds 5 to 10 mph.

Friday Night: Clear in the evening then becoming partly cloudy. Lows in the upper 40s to mid 50s.

Saturday: Partly cloudy in the morning then becoming sunny. Highs in the mid 60s to lower 80s.

Saturday Night through Monday: Mostly clear. Lows in the 40s to mid 50s. Highs in the mid 60s to lower 80s.

Monday Night: Clear. Lows in the 40s to mid 50s.

Tuesday: Sunny. Highs in the mid 60s to lower 80s.

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