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NAPA RIVER - NAPA (APCC1)

Latitude: 38.37º N	Longitude: 122.30º W	Elevation: 25 Feet
Location: Napa County in California		Bulletin Group: Russian Napa		River Group: Russian Napa

Issuance Time:

Dec 08, 2023 at 8:09 AM PST

Monitor Stage: 22.0 Feet

Flood Stage: 25.0 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 File Download (Data in feet): APCC1

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		Official Forecast (Deterministic)

		Prob. of Threshold Exceedance
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Impacts - E19 Information
20.0 Feet	Erosion of lowest agricultural areas along river begins.
22.0 Feet	In the city of Napa, the Napa River Dry Bypass is fully inundated and flow begins to cross McKinstry Street.
24.0 Feet	In the city of Napa, flow begins to leave the Napa River channel at RiverPointe (North of Lincoln Avenue).
25.0 Feet	Flooding of lowest parts of towns in reach begins. Inundation of lowest agricultural land in Napa Valley. Some secondary roads are inundated. Moderate damage from bank erosion and sediment deposition throughout the reach.
26.0 Feet	In the city of Napa, flow begins to leave the Napa River channel in the South Coombs area (north of Imola Avenue) and the south oxbow (near Taylor Street). Crop losses and erosion damage become serious. Moderate flood damage in lower parts of urban areas along the reach. Transportation in the Napa Valley becoming difficult. The flood of 2/3/1998 measured 26.72 feet.
27.0 Feet	In the city of Napa, moderate flooding begins on the east side of Napa River near Milliken Creek Inn.
28.0 Feet	In the city of Napa, significant flooding occurs near Lincoln Avenue with some secondary roads inundated. Major flooding of towns within the reach of the gage, especially Napa. Inundation of agricultural land, major damage from bank erosion and sediment deposition in Napa Valley. Transporation difficult throughout the Napa Valley. The 1/1/1997 flood measured 28.07 feet and cut off east-west travel except at Highway 29 over the Napa River.
29.0 Feet	In the city of Napa, the Soscol Corridor between the Bypass and LakePark is inundated, and the LakePark area begins to flood and flow begins to leave the Napa River at Riverside Drive.
30.0 Feet	In the city of Napa, flooding in the south oxbow area expands south towards Tulocay Creek and Imola Avenue begins to flood on both sides of the river. Major flooding continues in the Napa Valley, with major damage to homes and businesses, especially in Napa. Transportation impossible in the Napa Valley. 20,000 acres possible flooded in the Napa Valley. Between 5,000 and 7,000 evacuations occurred in the 2/18/1986 record flood, 37,000 cfs and 30.20 feet.
32.0 Feet	Widespread flooding occurs in the entire Napa Valley, with transportation impossible. Disastrous damage to homes and businesses in the Napa Valley, especially the city of Napa.

Official 7 Day National Weather Service Forecast (CAZ506)

Today: Sunny. Patchy fog and frost in the morning. Highs in the mid 50s to lower 60s. Northwest winds 5 to 15 mph.

Tonight: Mostly clear. Areas of frost after midnight. Lows in the upper 20s to lower 40s. Northwest winds 5 to 15 mph.

Saturday: Sunny in the morning then becoming partly cloudy. Areas of frost in the morning. Highs in the mid 50s to lower 60s. Northeast winds up to 5 mph and becoming southeast in the afternoon.

Saturday Night: Mostly cloudy. Areas of frost after midnight. Lows in the lower 30s to mid 40s. Northeast winds up to 5 mph.

Sunday: Mostly cloudy. Highs in the 50s to mid 60s. Northeast winds up to 5 mph and becoming northwest around 5 mph in the afternoon.

Sunday Night: Partly cloudy. Lows in the mid 30s to upper 40s.

Monday: Partly cloudy in the morning then becoming sunny. Highs in the upper 50s to mid 60s.

Monday Night through Tuesday Night: Mostly clear. Lows in the mid 30s to upper 40s. Highs in the 50s to upper 60s.

Wednesday through Thursday: Partly cloudy. Highs in the 50s to mid 60s. Lows in the 30s to mid 40s.

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