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COLUMBIA - GRAND COULEE DAM (GCDW1) Forecasts for Water Year 2027 |
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Natural Forecast
ESP with 10 Days QPF Ensemble: 2026-10-22 Issued: 2026-10-22 Hide Forecast | |||||
| Forecasts Are in KAF | 30 Year Average (1991-2020) | ||||
| 90 % | 50 % | % Average |
10 % | ||
| APR-SEP | 44093 | 54601 | 87 | 71136 | 62538 |
| APR-JUL | 34606 | 43373 | 82 | 54646 | 52578 |
| APR-AUG | 40727 | 50515 | 86 | 65315 | 58757 |
| JAN-SEP | 49889 | 60347 | 85 | 78615 | 71301 |
| JAN-JUL | 40883 | 49955 | 81 | 62304 | 61341 |
| OCT-SEP | 55802 | 67248 | 84 | 84726 | 80441 |
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Experimental
HEFS with 15 days EQPF Ensemble: 2026-10-22 Issued: 2026-10-22 Hide Forecast | |||||
| APR-SEP | 44342 | 55419 | 89 | 71325 | 62538 |
| APR-JUL | 34879 | 43491 | 83 | 54928 | 52578 |
| APR-AUG | 40952 | 51061 | 87 | 65581 | 58757 |
| JAN-SEP | 50182 | 61344 | 86 | 79192 | 71301 |
| JAN-JUL | 41156 | 50592 | 82 | 62722 | 61341 |
| OCT-SEP | 56430 | 68218 | 85 | 85986 | 80441 |
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Reference
ESP with 0 Days QPF Ensemble: 2026-10-22 Issued: 2026-10-22 Hide Forecast | |||||
| APR-SEP | 45947 | 56530 | 90 | 71842 | 62538 |
| APR-JUL | 36152 | 44524 | 85 | 56121 | 52578 |
| APR-AUG | 42330 | 52050 | 89 | 66374 | 58757 |
| JAN-SEP | 51967 | 63354 | 89 | 80250 | 71301 |
| JAN-JUL | 42456 | 50987 | 83 | 63557 | 61341 |
| OCT-SEP | 58262 | 69552 | 86 | 87127 | 80441 |
| Move the mouse over the desired "Forecast Period" to display a graph. | |||||
APR-SEP
