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RUSSIAN RIVER - HOPLAND (HOPC1)

Latitude: 39.03º N	Longitude: 123.13º W	Elevation: 498 Feet
Location: Mendocino County in California		Bulletin Group: Russian Napa		River Group: Russian Napa

Issuance Time:

Dec 08, 2023 at 8:09 AM PST

Monitor Stage: N/A

Flood Stage: 15.0 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): HOPC1

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		Official Forecast (Deterministic)

		Prob. of Threshold Exceedance
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What information is considered in this forecast?

Verification / Historical Plots
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Impacts - E19 Information
15.0 Feet	Flooding of Highway 175 is expected at the approaches to the Russian River bridge. Expect minor flooding of crop land on the right bank of the river.
17.0 Feet	Significant flooding of Highway 175 at the approaches to the Russian River bridge. Minor flooding of Highway 222 near Ukiah, and in crop land along the left and right banks of the Russian River near Hopland.
18.0 Feet	Flooding of Highway 222 near Ukiah. Secondary roads in low-lying areas will be flooded in the Hopland, Ukiah, and Talmage areas.
20.0 Feet	Flooding of low-lying structures east of the railroad tracks near Hopland.
21.0 Feet	Flooding of low-lying structures just west of the railroad tracks near Hopland.
23.0 Feet	Flooding of farm land, buildings and low-lying homes in the Hopland area. Flooding will begin in the Ukiah and Talmage areas.
24.0 Feet	Flooding of low-lying structures and farm land in the Hopland, Ukiah, and Talmage areas. Many secondary roads may also be flooded. Severe bank erosion is possible.
25.0 Feet	Severe bank erosion is likely with widespread flooding of farm land, buildings and low-lying homes in the Hopland, Ukiah, and Talmage areas. Many secondary roads will be flooded. This level of flooding caused 6100 acres to flood in February 1940.
26.0 Feet	Widespread major flooding will occur. Primary roads and some bridges will flood.
27.0 Feet	Widespread major flooding. At the forecast level, over 500 homes and farm buildings were damaged on December 22,1955. 6300 acres of land were inundated by flood waters. All persons in the area are urged to move to high ground and take appropriate action to protect life and property.
28.0 Feet	Disastrous flooding will occur. Many homes and businesses could be damaged. Many primary and secondary roads and some bridges could be washed out.
30.0 Feet	Disastrous flooding. Many homes and businesses damaged. Numerous primary and secondary roads and some bridges could be washed out. This is equal to the highest known stage, which occurred in December 1937. 6500 acres were inundated by flood waters.

Official 7 Day National Weather Service Forecast (CAZ113)

Today: Sunny. Highs 46 to 57.

Tonight: Mostly clear. Lows 30 to 40.

Saturday: Mostly sunny. Highs 53 to 63.

Saturday Night: Mostly cloudy. Lows 35 to 45.

Sunday: Mostly cloudy. Highs 53 to 64.

Sunday Night and Monday: Partly cloudy. Slight chance of rain. Lows 37 to 47. Highs 53 to 65.

Monday Night and Tuesday: Partly cloudy. Lows 37 to 47. Highs 54 to 67.

Tuesday Night: Mostly clear. Lows 36 to 46.

Wednesday: Partly cloudy. Highs 55 to 65.

Wednesday Night: Partly cloudy. Slight chance of rain. Lows 37 to 47.

Thursday: Mostly cloudy in the morning then becoming partly cloudy. Highs 53 to 64.

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