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COLUMBIA - GRAND COULEE DAM
(
GCDW1
)
Forecasts for Water Year
2026
Natural Forecast
ESP with 10 Days QPF
Ensemble:
2025-10-12
Issued:
2025-10-12
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
46094
56732
91
72187
62538
APR-JUL
36640
44680
85
56709
52578
APR-AUG
42533
52194
89
66841
58757
JAN-SEP
52162
63690
89
81005
71301
JAN-JUL
42707
51509
84
64183
61341
OCT-SEP
58401
70020
87
87788
80441
Experimental
HEFS with 15 days EQPF
Ensemble:
2025-10-12
Issued:
2025-10-12
Hide Forecast
APR-SEP
47132
57353
92
73714
62538
APR-JUL
37050
45177
86
57339
52578
APR-AUG
43482
53039
90
68105
58757
JAN-SEP
53202
64482
90
81223
71301
JAN-JUL
43486
52391
85
64848
61341
OCT-SEP
59285
70895
88
88782
80441
Reference
ESP with 0 Days QPF
Ensemble:
2025-10-12
Issued:
2025-10-12
Hide Forecast
APR-SEP
47462
57824
92
73435
62538
APR-JUL
37320
45080
86
57083
52578
APR-AUG
43747
53726
91
67833
58757
JAN-SEP
53236
64569
91
80821
71301
JAN-JUL
43663
52284
85
65152
61341
OCT-SEP
59221
71818
89
87399
80441
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 206, 278, 340, 400, 430, 83, , 87
ESP10, 200, 274, 334, 395, 424, 98, , 102
ESP10, 204, 277, 339, 398, 430, 113, , 117
ESP10, 202, 280, 337, 396, 429, 128, , 132
ESP10, 201, 281, 337, 392, 425, 142, , 146
ESP10, 198, 278, 335, 388, 428, 157, , 161
ESP10, 204, 282, 336, 388, 435, 172, , 176
ESP10, 207, 284, 342, 390, 436, 187, , 191
ESP10, 209, 285, 344, 392, 437, 202, , 206
ESP10, 208, 286, 341, 390, 436, 217, , 221
ESP10, 211, 292, 345, 392, 436, 232, , 236
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ESP10
HEFS
ESP0
Data Files
/chpsesp/ensemble/natural/GCDW1N_SQIN.ESPF10.csv
GCDW1N_SQIN.ESPF0.csv|2025-10-12
GCDW1N_SQIN.ESPF10.csv|2025-10-12
GCDW1N_SQIN.ESPFM.csv|2025-10-12
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
Last Forecast