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 11, 2025 at 8:05 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) 07/11/2025Median Forecast: 83.7 kaf

Combination chart with 61 data series.
Created: 07/11/2025 at 08:05 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% -- -- -- -- -- -- -- -- -- 79.7 82.0 83.9
25% -- -- -- -- -- -- -- -- -- 79.7 82.0 83.8
50%
(Median)
-- -- -- -- -- -- -- -- -- 79.7 82.0 83.7
75% -- -- -- -- -- -- -- -- -- 79.7 82.0 83.7
90% -- -- -- -- -- -- -- -- -- 79.7 82.0 83.7

Location Photographs

ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ067)
Today: Sunny. Areas of smoke. Highs 92 to 102. Light winds becoming southwest up to 10 mph in the afternoon.

Tonight: Clear. Areas of smoke. Lows 66 to 74. Light winds.

Saturday: Sunny. Areas of smoke. Highs 91 to 101. Light winds becoming southwest up to 10 mph in the afternoon.

Saturday Night: Areas of smoke in the evening. Clear. Lows 63 to 73. Prevailing west winds up to 10 mph in the evening becoming light.

Sunday: Sunny. Highs 90 to 100. Light winds becoming west up to 10 mph in the afternoon.

Sunday Night: Clear. Lows 63 to 73.

Monday: Sunny. Highs 91 to 101.

Monday Night and Tuesday: Clear. Lows 62 to 72. Highs 86 to 101.

Tuesday Night through Thursday: Clear. Lows 57 to 67. Highs 82 to 96.