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

Raw ESP Water Supply Forecast

*CAUTION: Data below is raw model output and has not been reviewed
*         by a hydrologist.

Program run: 07/11/2025 1533Z
Data ending: 07/11/2025 12Z
* All units are in thousands of acre-feet.

Station: FOLC1 (American - Folsom Reservoir)

MONTHLY DATA

October    Obs:   10.6  Mean:   30.8  WY-to-date: Obs:   10.6 Mean:   30.8
2024       % of mean:    34% 

November   Obs:   34.0  Mean:   86.7  WY-to-date: Obs:   44.6 Mean:  117.5
2024       % of mean:    39% 

December   Obs:  147.8  Mean:  222.7  WY-to-date: Obs:  192.4 Mean:  340.2
2024       % of mean:    66% 

January    Obs:  112.6  Mean:  342.2  WY-to-date: Obs:  304.9 Mean:  682.4
2025       % of mean:    33% 

February   Obs:  618.6  Mean:  370.5  WY-to-date: Obs:  923.6 Mean: 1050.1
2025       % of mean:    167% 

March      Obs:  385.7  Mean:  462.4  WY-to-date: Obs: 1309.3 Mean: 1512.5
2025       % of mean:    83% 

April      Obs:  507.0  Mean:  446.2  WY-to-date: Obs: 1816.2 Mean: 1958.7
2025       % of mean:    114% 

May        Obs:  342.7  Mean:  443.5  WY-to-date: Obs: 2158.9 Mean: 2402.2
2025       % of mean:    77% 

June       Obs:  113.8  Mean:  236.6  WY-to-date: Obs: 2272.7 Mean: 2638.8
2025       % of mean:    48% 

July       Obs (thru 11@12Z):   11.9    Mean:   61.7  WY-to-date: Obs: 2284.6 Mean: 2677.6
2025       Prob. level:      90    75    50    25    10
           Fcst Residual:    10    10    10    10    10
           Obs + Fcst:       22    22    22    22    22
           % of mean:                    35% 

August     Mean:   11.8
2025       Prob. level:      90    75    50    25    10
           Forecast:          8     8     8     9    10
           % of mean:                    70% 

September  Mean:   13.3
2025       Prob. level:      90    75    50    25    10
           Forecast:         10    10    11    14    19
           % of mean:                    83% 

-------------------------------------------------------

Water Year Obs-To-Date: 2284.6    Mean: 2728.4
WY2025     Prob. level:      90    75    50    25    10
           Fcst Residual:    27    28    29    33    37
           Obs + Fcst:     2312  2312  2314  2318  2321
           % of mean:                    85%