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| NISQUALLY--ALDER RESERVOIR | |
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| Forecasts are calculated from a forecast time series that approximates flow at a 6 hour time step interval. Observed instantaneous peaks can be higher than model forecast peaks. |
| NISQUALLY--ALDER RESERVOIR (ALRW1) Forecasts for Water Year 2027 Ensemble Date: 2026-10-09 Forecast Period: October 9 to February 1 | |||
| Exceedence Probability | Inflow CFS | Probable Date of Peak | |
| 95 % | 3615 | 2026-11-05 | |
| 90 % | 4912 | 2026-11-13 | |
| 70 % | 8023 | 2026-12-03 | |
| 50 % | 14557 | 2026-12-27 | |
| 30 % | 18509 | 2027-01-13 | |
| 10 % | 27059 | 2027-01-26 | |
| 05 % | 30965 | 2027-01-30 | |
