National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service



MIDDLE FORK COSUMNES RIVER - SOMERSET (SOSC1)
Latitude: 38.62º NLongitude: 120.70º WElevation: 1821 Feet
Location: El Dorado County in CaliforniaBulletin Group: San JoaquinRiver Group: North San Joaquin
Issuance Time: Jul 10, 2025 at 8:23 AM PDT
Please Note:Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.

Flow data on this product are unregulated / full natural flow.
2025 Water Year Accumulated Volume PlotCSV Ensemble Files (Data in kcfs):  Forecast Group  |  SOSC1

MF COSUMNES - SOMERSET, NR (SOSC1) 07/10/2025Median Forecast: 83.8 kaf

Combination chart with 61 data series.
Created: 07/10/2025 at 08:23 AM PDT
The chart has 1 X axis displaying Water Year 2025 - Day (mm/dd). Range: 2024-09-27 20:24:00 to 2025-10-05 03:36:00.
The chart has 2 Y axes displaying Water Year Volumes (1000s Ac-Ft) and Daily Observed Volumes (1000s Ac-Ft).
End of interactive chart.

Tabular Monthly Volume Accumulation (1000s of Acre-Feet)
Probability Nov 1
2024
Dec 1
2024
Jan 1
2025
Feb 1
2025
Mar 1
2025
Apr 1
2025
May 1
2025
Jun 1
2025
Jul 1
2025
Aug 1
2025
Sep 1
2025
Oct 1
2025
10% -- -- -- -- -- -- -- -- -- 79.8 82.0 84.0
25% -- -- -- -- -- -- -- -- -- 79.8 82.0 83.8
50%
(Median)
-- -- -- -- -- -- -- -- -- 79.8 82.0 83.8
75% -- -- -- -- -- -- -- -- -- 79.8 82.0 83.7
90% -- -- -- -- -- -- -- -- -- 79.8 82.0 83.7

Location Photographs

ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ067)
Today: Sunny. Areas of smoke late in the afternoon. Warmer. Highs 89 to 101. Light winds becoming west up to 10 mph in the afternoon.

Tonight: Clear. Areas of smoke. Lows 65 to 73. Light winds.

Friday: Sunny. Highs 92 to 102. Light winds becoming west up to 10 mph in the afternoon.

Friday Night: Clear. Lows 66 to 74. Prevailing west winds up to 10 mph in the evening becoming light.

Saturday: Sunny. Highs 91 to 101. Light winds becoming west up to 10 mph in the afternoon.

Saturday Night: Clear. Lows 63 to 73.

Sunday: Sunny. Highs 91 to 101.

Sunday Night through Wednesday: Clear. Lows 61 to 74. Highs 87 to 101.