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Water Year
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COLUMBIA - GRAND COULEE DAM
(
GCDW1
)
Forecasts for Water Year
2026
Natural Forecast
ESP with 10 Days QPF
Ensemble:
2026-03-04
Issued:
2026-03-04
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
60708
64969
104
70753
62538
APR-JUL
47188
52700
100
58276
52578
APR-AUG
56218
60424
103
66292
58757
JAN-SEP
72109
76584
107
82505
71301
JAN-JUL
58282
63911
104
69542
61341
OCT-SEP
82004
86479
108
92399
80441
Experimental
HEFS with 15 days EQPF
Ensemble:
2026-03-04
Issued:
2026-03-04
Hide Forecast
APR-SEP
58640
64491
103
70650
62538
APR-JUL
45548
52055
99
56826
52578
APR-AUG
53886
60216
102
65440
58757
JAN-SEP
69546
76091
107
82040
71301
JAN-JUL
56879
63051
103
68372
61341
OCT-SEP
79441
85985
107
91935
80441
Reference
ESP with 0 Days QPF
Ensemble:
2026-03-04
Issued:
2026-03-04
Hide Forecast
APR-SEP
56311
62087
99
68693
62538
APR-JUL
43794
50290
96
54820
52578
APR-AUG
51791
58041
99
63352
58757
JAN-SEP
66987
73443
103
79962
71301
JAN-JUL
55010
60868
99
65961
61341
OCT-SEP
76881
83338
104
89857
80441
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 231, 296, 352, 406, 433, 72, , 76
ESP10, 226, 293, 347, 402, 427, 77, , 81
ESP10, 229, 295, 351, 404, 433, 81, , 85
ESP10, 227, 298, 350, 402, 432, 85, , 89
ESP10, 226, 298, 349, 399, 429, 89, , 93
ESP10, 223, 296, 347, 396, 431, 94, , 98
ESP10, 229, 300, 348, 396, 437, 98, , 102
ESP10, 232, 301, 354, 397, 438, 102, , 106
ESP10, 233, 303, 355, 399, 439, 107, , 111
ESP10, 233, 303, 353, 397, 439, 111, , 115
ESP10, 236, 308, 356, 399, 439, 115, , 119
ESP10, 235, 308, 357, 401, 439, 120, , 124
ESP10, 229, 301, 350, 395, 434, 124, , 128
ESP10, 231, 304, 354, 397, 437, 128, , 132
ESP10, 232, 303, 352, 396, 437, 132, , 136
ESP10, 220, 292, 338, 386, 428, 137, , 141
ESP10, 210, 284, 329, 380, 418, 141, , 145
ESP10, 220, 294, 343, 390, 429, 145, , 149
ESP10, 220, 294, 346, 390, 431, 150, , 154
ESP10, 220, 294, 349, 395, 434, 154, , 158
ESP10, 209, 285, 343, 386, 425, 158, , 162
ESP10, 209, 287, 342, 387, 424, 162, , 166
ESP10, 203, 288, 336, 385, 425, 167, , 171
ESP10, 210, 297, 347, 394, 434, 171, , 175
ESP10, 214, 302, 351, 398, 436, 175, , 179
ESP10, 219, 315, 355, 404, 441, 180, , 184
ESP10, 222, 315, 356, 405, 442, 184, , 188
ESP10, 224, 314, 356, 405, 442, 188, , 192
ESP10, 214, 304, 348, 398, 434, 193, , 197
ESP10, 199, 289, 336, 386, 423, 197, , 201
ESP10, 200, 289, 339, 388, 428, 201, , 205
ESP10, 204, 293, 342, 391, 434, 205, , 209
ESP10, 203, 290, 340, 390, 433, 210, , 214
ESP10, 213, 302, 350, 398, 442, 214, , 218
ESP10, 221, 305, 351, 398, 443, 218, , 222
ESP10, 222, 305, 351, 399, 441, 223, , 227
ESP10, 223, 304, 351, 397, 440, 227, , 231
ESP10, 217, 294, 346, 388, 433, 231, , 235
ESP10, 224, 299, 353, 393, 440, 236, , 240
ESP10, 222, 300, 355, 391, 440, 240, , 244
ESP10, 227, 302, 356, 389, 439, 244, , 248
ESP10, 229, 302, 353, 393, 436, 248, , 252
ESP10, 239, 309, 362, 401, 443, 253, , 257
ESP10, 249, 318, 367, 402, 448, 257, , 261
ESP10, 242, 313, 358, 392, 438, 261, , 265
ESP10, 250, 316, 363, 397, 442, 266, , 270
ESP10, 243, 307, 355, 391, 438, 270, , 274
ESP10, 250, 312, 363, 397, 448, 274, , 278
ESP10, 245, 306, 360, 394, 443, 278, , 282
ESP10, 248, 307, 363, 395, 447, 283, , 287
ESP10, 253, 310, 363, 396, 446, 287, , 291
ESP10, 254, 316, 359, 396, 442, 291, , 295
ESP10, 251, 317, 361, 392, 438, 296, , 300
ESP10, 260, 326, 370, 403, 445, 300, , 304
ESP10, 255, 321, 364, 402, 439, 304, , 308
ESP10, 257, 318, 361, 401, 442, 309, , 313
ESP10, 255, 314, 356, 397, 438, 313, , 317
ESP10, 257, 313, 355, 400, 439, 317, , 321
ESP10, 257, 316, 361, 405, 440, 321, , 325
ESP10, 249, 302, 352, 395, 429, 326, , 330
ESP10, 238, 292, 342, 388, 420, 330, , 334
ESP10, 241, 293, 343, 388, 422, 334, , 338
ESP10, 237, 286, 336, 380, 415, 339, , 343
ESP10, 221, 266, 317, 362, 404, 343, , 347
ESP10, 224, 270, 325, 366, 410, 347, , 351
ESP10, 220, 269, 322, 361, 410, 351, , 355
ESP10, 228, 277, 331, 369, 417, 356, , 360
ESP10, 215, 263, 318, 355, 404, 360, , 364
ESP10, 188, 236, 289, 328, 379, 364, , 368
ESP10, 180, 230, 281, 319, 373, 369, , 373
ESP10, 178, 238, 282, 318, 374, 373, , 377
ESP10, 185, 250, 288, 326, 383, 377, , 381
ESP10, 186, 251, 291, 329, 385, 382, , 386
ESP10, 180, 242, 286, 321, 379, 386, , 390
ESP10, 186, 240, 294, 320, 378, 390, , 394
ESP10, 190, 240, 295, 323, 379, 394, , 398
ESP10, 192, 241, 301, 324, 381, 399, , 403
ESP10, 190, 240, 298, 321, 378, 403, , 407
ESP10, 183, 233, 289, 315, 370, 407, , 411
ESP10, 189, 232, 282, 311, 366, 412, , 416
ESP10, 201, 240, 288, 318, 371, 416, , 420
ESP10, 206, 241, 287, 316, 371, 420, , 424
ESP10, 218, 253, 298, 325, 382, 424, , 428
ESP10, 223, 256, 300, 330, 385, 429, , 433
ESP10, 218, 248, 295, 328, 381, 433, , 437
ESP10, 213, 245, 291, 330, 379, 437, , 441
ESP10, 215, 247, 296, 330, 380, 442, , 446
ESP10, 221, 252, 298, 332, 391, 446, , 450
ESP10, 217, 253, 295, 328, 389, 450, , 454
ESP10, 223, 256, 299, 329, 389, 455, , 459
ESP10, 230, 264, 307, 334, 391, 459, , 463
ESP10, 226, 265, 305, 331, 387, 463, , 467
ESP10, 220, 259, 304, 326, 385, 467, , 471
ESP10, 221, 261, 305, 328, 390, 472, , 476
ESP10, 212, 256, 297, 321, 384, 476, , 480
ESP10, 210, 266, 300, 323, 385, 480, , 484
ESP10, 213, 264, 303, 323, 384, 485, , 489
ESP10, 212, 262, 299, 326, 382, 489, , 493
ESP10, 214, 262, 297, 325, 379, 493, , 497
ESP10, 215, 259, 292, 326, 375, 497, , 501
ESP10, 214, 257, 290, 328, 373, 502, , 506
ESP10, 217, 255, 292, 331, 374, 506, , 510
ESP10, 217, 253, 291, 330, 371, 510, , 514
ESP10, 215, 257, 292, 327, 368, 515, , 519
ESP10, 218, 256, 293, 325, 367, 519, , 523
ESP10, 220, 260, 295, 325, 366, 523, , 527
ESP10, 220, 263, 294, 324, 365, 528, , 532
ESP10, 221, 265, 296, 326, 366, 532, , 536
ESP10, 222, 269, 297, 324, 365, 536, , 540
ESP10, 233, 278, 306, 333, 373, 540, , 544
ESP10, 240, 284, 308, 337, 374, 545, , 549
ESP10, 245, 290, 313, 341, 378, 549, , 553
ESP10, 244, 291, 315, 342, 378, 553, , 557
ESP10, 248, 295, 321, 346, 382, 558, , 562
ESP10, 248, 295, 320, 347, 381, 562, , 566
ESP10, 245, 290, 316, 343, 376, 566, , 570
ESP10, 249, 298, 319, 347, 379, 571, , 575
ESP10, 250, 303, 319, 350, 380, 575, , 579
ESP10, 254, 304, 320, 351, 380, 579, , 583
ESP10, 253, 306, 322, 351, 382, 583, , 587
ESP10, 251, 304, 323, 350, 382, 588, , 592
ESP10, 244, 294, 314, 341, 375, 592, , 596
ESP10, 238, 286, 306, 334, 369, 596, , 600
ESP10, 245, 290, 310, 336, 373, 601, , 605
ESP10, 251, 291, 312, 337, 376, 605, , 609
ESP10, 250, 289, 311, 336, 374, 609, , 613
ESP10, 249, 285, 307, 331, 369, 613, , 617
ESP10, 257, 297, 313, 339, 376, 618, , 622
ESP10, 258, 294, 311, 338, 372, 622, , 626
ESP10, 256, 292, 314, 338, 369, 626, , 630
ESP10, 259, 297, 317, 341, 370, 631, , 635
ESP10, 261, 300, 322, 341, 369, 635, , 639
ESP10, 255, 294, 317, 335, 363, 639, , 643
ESP10, 258, 297, 320, 339, 365, 644, , 648
ESP10, 255, 296, 316, 339, 361, 648, , 652
ESP10, 242, 284, 303, 329, 348, 652, , 656
ESP10, 243, 284, 302, 329, 350, 656, , 660
ESP10, 249, 290, 310, 334, 357, 661, , 665
ESP10, 241, 279, 303, 322, 346, 665, , 669
ESP10, 253, 287, 313, 331, 355, 669, , 673
ESP10, 248, 282, 306, 327, 349, 674, , 678
ESP10, 258, 289, 311, 333, 356, 678, , 682
ESP10, 256, 286, 309, 331, 354, 682, , 686
ESP10, 263, 291, 315, 336, 361, 686, , 690
ESP10, 268, 291, 315, 338, 362, 691, , 695
ESP10, 270, 293, 316, 340, 365, 695, , 699
ESP10, 269, 294, 318, 339, 364, 699, , 703
ESP10, 264, 290, 312, 332, 358, 704, , 708
ESP10, 261, 287, 309, 326, 353, 708, , 712
ESP10, 256, 281, 300, 316, 343, 712, , 716
ESP10, 259, 283, 303, 319, 342, 717, , 721
ESP10, 258, 278, 301, 315, 337, 721, , 725
ESP10, 251, 271, 294, 309, 329, 725, , 729
ESP10, 247, 266, 292, 303, 325, 729, , 733
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Data Files
/chpsesp/ensemble/natural/GCDW1N_SQIN.ESPF10.csv
GCDW1N_SQIN.ESPF0.csv|2026-03-04
GCDW1N_SQIN.ESPF10.csv|2026-03-04
GCDW1N_SQIN.ESPFM.csv|2026-03-04
APR-SEP
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ESP10,ESPM,ESP0
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