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.

Issued:      04/24/2026 1625Z
Data ending: 04/24/2026 12Z
* All units are in thousands of acre-feet.

Station: FOLC1 (American - Folsom Reservoir)

MONTHLY DATA

April      Obs (through 24@12Z):  373.1    Mean:  447.5
2026       Prob. level:      90    75    50    25    10
           Fcst Residual:   100   103   106   111   116
           Obs + Fcst:      473   476   479   484   489
           % of mean:                   107% 

May        Mean:  444.3
2026       Prob. level:      90    75    50    25    10
           Forecast:        176   186   210   246   333
           % of mean:                    47% 

June       Mean:  235.0
2026       Prob. level:      90    75    50    25    10
           Forecast:         48    51    58    66   128
           % of mean:                    25% 

July       Mean:   60.8
2026       Prob. level:      90    75    50    25    10
           Forecast:          8     9    11    16    24
           % of mean:                    18% 

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

Seasonal   Obs-To-Date:  373.1  Mean: 1187.7
           Prob. level:      90    75    50    25    10
           Fcst Residual:   339   359   389   460   573
           Obs + Fcst:      713   732   762   833   946
           % of mean:                    64%