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Archive:
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COLUMBIA - GRAND COULEE DAM
(
GCDW1
)
Forecasts for Water Year
2026
Natural Forecast
ESP with 10 Days QPF
Ensemble:
2026-06-23
Issued:
2026-06-23
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
57163
58620
94
60803
62538
APR-JUL
47184
47694
91
48270
52578
APR-AUG
53616
54657
93
55992
58757
JAN-SEP
69316
70773
99
72956
71301
JAN-JUL
59337
59847
98
60423
61341
OCT-SEP
79211
80668
100
82851
80441
Experimental
HEFS with 15 days EQPF
Ensemble:
2026-06-23
Issued:
2026-06-23
Hide Forecast
APR-SEP
57382
58987
94
60889
62538
APR-JUL
47170
47877
91
48658
52578
APR-AUG
53585
54696
93
55889
58757
JAN-SEP
69535
71140
100
73042
71301
JAN-JUL
59324
60030
98
60812
61341
OCT-SEP
79430
81035
101
82937
80441
Reference
ESP with 0 Days QPF
Ensemble:
2026-06-23
Issued:
2026-06-23
Hide Forecast
APR-SEP
57399
58973
94
60853
62538
APR-JUL
47242
47818
91
49029
52578
APR-AUG
53183
54699
93
56338
58757
JAN-SEP
69552
71126
100
73007
71301
JAN-JUL
59396
59972
98
61183
61341
OCT-SEP
79447
81021
101
82901
80441
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 231, 296, 352, 406, 433, 71, , 75
ESP10, 226, 293, 347, 402, 427, 73, , 77
ESP10, 229, 295, 351, 404, 433, 76, , 80
ESP10, 227, 298, 350, 402, 432, 78, , 82
ESP10, 226, 298, 349, 399, 429, 81, , 85
ESP10, 223, 296, 347, 396, 431, 83, , 87
ESP10, 229, 300, 348, 396, 437, 86, , 90
ESP10, 232, 301, 354, 397, 438, 88, , 92
ESP10, 233, 303, 355, 399, 439, 91, , 95
ESP10, 233, 303, 353, 397, 439, 93, , 97
ESP10, 236, 308, 356, 399, 439, 96, , 100
ESP10, 235, 308, 357, 401, 439, 98, , 102
ESP10, 229, 301, 350, 395, 434, 101, , 105
ESP10, 231, 304, 354, 397, 437, 103, , 107
ESP10, 232, 303, 352, 396, 437, 106, , 110
ESP10, 220, 292, 338, 386, 428, 108, , 112
ESP10, 210, 284, 329, 380, 418, 111, , 115
ESP10, 220, 294, 343, 390, 429, 113, , 117
ESP10, 220, 294, 346, 390, 431, 116, , 120
ESP10, 220, 294, 349, 395, 434, 118, , 122
ESP10, 209, 285, 343, 386, 425, 121, , 125
ESP10, 209, 287, 342, 387, 424, 123, , 127
ESP10, 203, 288, 336, 385, 425, 126, , 130
ESP10, 210, 297, 347, 394, 434, 128, , 132
ESP10, 214, 302, 351, 398, 436, 131, , 135
ESP10, 219, 315, 355, 404, 441, 133, , 137
ESP10, 222, 315, 356, 405, 442, 136, , 140
ESP10, 224, 314, 356, 405, 442, 138, , 142
ESP10, 214, 304, 348, 398, 434, 141, , 145
ESP10, 199, 289, 336, 386, 423, 143, , 147
ESP10, 200, 289, 339, 388, 428, 146, , 150
ESP10, 204, 293, 342, 391, 434, 148, , 152
ESP10, 203, 290, 340, 390, 433, 151, , 155
ESP10, 213, 302, 350, 398, 442, 153, , 157
ESP10, 221, 305, 351, 398, 443, 156, , 160
ESP10, 222, 305, 351, 399, 441, 158, , 162
ESP10, 223, 304, 351, 397, 440, 161, , 165
ESP10, 217, 294, 346, 388, 433, 163, , 167
ESP10, 224, 299, 353, 393, 440, 166, , 170
ESP10, 222, 300, 355, 391, 440, 168, , 172
ESP10, 227, 302, 356, 389, 439, 171, , 175
ESP10, 229, 302, 353, 393, 436, 173, , 177
ESP10, 239, 309, 362, 401, 443, 176, , 180
ESP10, 249, 318, 367, 402, 448, 178, , 182
ESP10, 242, 313, 358, 392, 438, 181, , 185
ESP10, 250, 316, 363, 397, 442, 183, , 187
ESP10, 243, 307, 355, 391, 438, 186, , 190
ESP10, 250, 312, 363, 397, 448, 188, , 192
ESP10, 245, 306, 360, 394, 443, 191, , 195
ESP10, 248, 307, 363, 395, 447, 193, , 197
ESP10, 253, 310, 363, 396, 446, 196, , 200
ESP10, 254, 316, 359, 396, 442, 198, , 202
ESP10, 251, 317, 361, 392, 438, 201, , 205
ESP10, 260, 326, 370, 403, 445, 204, , 208
ESP10, 255, 321, 364, 402, 439, 206, , 210
ESP10, 257, 318, 361, 401, 442, 209, , 213
ESP10, 255, 314, 356, 397, 438, 211, , 215
ESP10, 257, 313, 355, 400, 439, 214, , 218
ESP10, 257, 316, 361, 405, 440, 216, , 220
ESP10, 249, 302, 352, 395, 429, 219, , 223
ESP10, 238, 292, 342, 388, 420, 221, , 225
ESP10, 241, 293, 343, 388, 422, 224, , 228
ESP10, 237, 286, 336, 380, 415, 226, , 230
ESP10, 221, 266, 317, 362, 404, 229, , 233
ESP10, 224, 270, 325, 366, 410, 231, , 235
ESP10, 220, 269, 322, 361, 410, 234, , 238
ESP10, 228, 277, 331, 369, 417, 236, , 240
ESP10, 215, 263, 318, 355, 404, 239, , 243
ESP10, 188, 236, 289, 328, 379, 241, , 245
ESP10, 180, 230, 281, 319, 373, 244, , 248
ESP10, 178, 238, 282, 318, 374, 246, , 250
ESP10, 185, 250, 288, 326, 383, 249, , 253
ESP10, 186, 251, 291, 329, 385, 251, , 255
ESP10, 180, 242, 286, 321, 379, 254, , 258
ESP10, 186, 240, 294, 320, 378, 256, , 260
ESP10, 190, 240, 295, 323, 379, 259, , 263
ESP10, 192, 241, 301, 324, 381, 261, , 265
ESP10, 190, 240, 298, 321, 378, 264, , 268
ESP10, 183, 233, 289, 315, 370, 266, , 270
ESP10, 189, 232, 282, 311, 366, 269, , 273
ESP10, 201, 240, 288, 318, 371, 271, , 275
ESP10, 206, 241, 287, 316, 371, 274, , 278
ESP10, 218, 253, 298, 325, 382, 276, , 280
ESP10, 223, 256, 300, 330, 385, 279, , 283
ESP10, 218, 248, 295, 328, 381, 281, , 285
ESP10, 213, 245, 291, 330, 379, 284, , 288
ESP10, 215, 247, 296, 330, 380, 286, , 290
ESP10, 221, 252, 298, 332, 391, 289, , 293
ESP10, 217, 253, 295, 328, 389, 291, , 295
ESP10, 223, 256, 299, 329, 389, 294, , 298
ESP10, 230, 264, 307, 334, 391, 296, , 300
ESP10, 226, 265, 305, 331, 387, 299, , 303
ESP10, 220, 259, 304, 326, 385, 301, , 305
ESP10, 221, 261, 305, 328, 390, 304, , 308
ESP10, 212, 256, 297, 321, 384, 306, , 310
ESP10, 210, 266, 300, 323, 385, 309, , 313
ESP10, 213, 264, 303, 323, 384, 311, , 315
ESP10, 212, 262, 299, 326, 382, 314, , 318
ESP10, 214, 262, 297, 325, 379, 316, , 320
ESP10, 215, 259, 292, 326, 375, 319, , 323
ESP10, 214, 257, 290, 328, 373, 321, , 325
ESP10, 217, 255, 292, 331, 374, 324, , 328
ESP10, 217, 253, 291, 330, 371, 326, , 330
ESP10, 215, 257, 292, 327, 368, 329, , 333
ESP10, 218, 256, 293, 325, 367, 331, , 335
ESP10, 220, 260, 295, 325, 366, 334, , 338
ESP10, 220, 263, 294, 324, 365, 337, , 341
ESP10, 221, 265, 296, 326, 366, 339, , 343
ESP10, 222, 269, 297, 324, 365, 342, , 346
ESP10, 233, 278, 306, 333, 373, 344, , 348
ESP10, 240, 284, 308, 337, 374, 347, , 351
ESP10, 245, 290, 313, 341, 378, 349, , 353
ESP10, 244, 291, 315, 342, 378, 352, , 356
ESP10, 248, 295, 321, 346, 382, 354, , 358
ESP10, 248, 295, 320, 347, 381, 357, , 361
ESP10, 245, 290, 316, 343, 376, 359, , 363
ESP10, 249, 298, 319, 347, 379, 362, , 366
ESP10, 250, 303, 319, 350, 380, 364, , 368
ESP10, 254, 304, 320, 351, 380, 367, , 371
ESP10, 253, 306, 322, 351, 382, 369, , 373
ESP10, 251, 304, 323, 350, 382, 372, , 376
ESP10, 244, 294, 314, 341, 375, 374, , 378
ESP10, 238, 286, 306, 334, 369, 377, , 381
ESP10, 245, 290, 310, 336, 373, 379, , 383
ESP10, 251, 291, 312, 337, 376, 382, , 386
ESP10, 250, 289, 311, 336, 374, 384, , 388
ESP10, 249, 285, 307, 331, 369, 387, , 391
ESP10, 257, 297, 313, 339, 376, 389, , 393
ESP10, 258, 294, 311, 338, 372, 392, , 396
ESP10, 256, 292, 314, 338, 369, 394, , 398
ESP10, 259, 297, 317, 341, 370, 397, , 401
ESP10, 261, 300, 322, 341, 369, 399, , 403
ESP10, 255, 294, 317, 335, 363, 402, , 406
ESP10, 258, 297, 320, 339, 365, 404, , 408
ESP10, 255, 296, 316, 339, 361, 407, , 411
ESP10, 242, 284, 303, 329, 348, 409, , 413
ESP10, 243, 284, 302, 329, 350, 412, , 416
ESP10, 249, 290, 310, 334, 357, 414, , 418
ESP10, 241, 279, 303, 322, 346, 417, , 421
ESP10, 253, 287, 313, 331, 355, 419, , 423
ESP10, 248, 282, 306, 327, 349, 422, , 426
ESP10, 258, 289, 311, 333, 356, 424, , 428
ESP10, 256, 286, 309, 331, 354, 427, , 431
ESP10, 263, 291, 315, 336, 361, 429, , 433
ESP10, 268, 291, 315, 338, 362, 432, , 436
ESP10, 270, 293, 316, 340, 365, 434, , 438
ESP10, 269, 294, 318, 339, 364, 437, , 441
ESP10, 264, 290, 312, 332, 358, 439, , 443
ESP10, 261, 287, 309, 326, 353, 442, , 446
ESP10, 256, 281, 300, 316, 343, 444, , 448
ESP10, 259, 283, 303, 319, 342, 447, , 451
ESP10, 258, 278, 301, 315, 337, 449, , 453
ESP10, 251, 271, 294, 309, 329, 452, , 456
ESP10, 247, 266, 292, 303, 325, 454, , 458
ESP10, 240, 263, 288, 298, 320, 457, , 461
ESP10, 241, 266, 286, 299, 317, 459, , 463
ESP10, 230, 255, 274, 287, 306, 462, , 466
ESP10, 233, 258, 275, 291, 310, 464, , 468
ESP10, 215, 243, 255, 275, 295, 467, , 471
ESP10, 231, 256, 270, 288, 308, 469, , 473
ESP10, 230, 257, 270, 289, 308, 472, , 476
ESP10, 225, 254, 267, 285, 303, 475, , 479
ESP10, 221, 248, 258, 278, 295, 477, , 481
ESP10, 229, 254, 264, 286, 301, 480, , 484
ESP10, 225, 251, 260, 280, 300, 482, , 486
ESP10, 221, 246, 257, 275, 296, 485, , 489
ESP10, 217, 240, 251, 269, 293, 487, , 491
ESP10, 220, 241, 255, 270, 295, 490, , 494
ESP10, 216, 237, 252, 271, 292, 492, , 496
ESP10, 217, 238, 252, 272, 295, 495, , 499
ESP10, 219, 234, 250, 268, 291, 497, , 501
ESP10, 226, 240, 253, 269, 295, 500, , 504
ESP10, 226, 239, 254, 267, 293, 502, , 506
ESP10, 216, 231, 246, 260, 283, 505, , 509
ESP10, 213, 228, 244, 258, 280, 507, , 511
ESP10, 216, 234, 251, 266, 286, 510, , 514
ESP10, 215, 236, 252, 266, 286, 512, , 516
ESP10, 217, 239, 257, 272, 290, 515, , 519
ESP10, 220, 243, 259, 278, 293, 517, , 521
ESP10, 225, 247, 264, 282, 297, 520, , 524
ESP10, 233, 254, 271, 290, 303, 522, , 526
ESP10, 235, 258, 272, 291, 305, 525, , 529
ESP10, 234, 258, 270, 288, 303, 527, , 531
ESP10, 238, 264, 279, 292, 309, 530, , 534
ESP10, 236, 264, 283, 295, 309, 532, , 536
ESP10, 232, 260, 279, 293, 309, 535, , 539
ESP10, 231, 260, 278, 294, 307, 537, , 541
ESP10, 234, 265, 282, 297, 310, 540, , 544
ESP10, 233, 263, 279, 296, 309, 542, , 546
ESP10, 229, 257, 272, 290, 302, 545, , 549
ESP10, 224, 254, 268, 286, 297, 547, , 551
ESP10, 223, 253, 268, 285, 296, 550, , 554
ESP10, 227, 258, 274, 291, 302, 552, , 556
ESP10, 232, 261, 276, 293, 304, 555, , 559
ESP10, 231, 262, 272, 290, 299, 557, , 561
ESP10, 240, 272, 279, 297, 308, 560, , 564
ESP10, 240, 270, 276, 294, 305, 562, , 566
ESP10, 243, 272, 280, 298, 308, 565, , 569
ESP10, 239, 266, 279, 294, 304, 567, , 571
ESP10, 241, 268, 281, 296, 306, 570, , 574
ESP10, 244, 270, 284, 299, 309, 572, , 576
ESP10, 244, 271, 286, 302, 310, 575, , 579
ESP10, 245, 272, 287, 304, 312, 577, , 581
ESP10, 254, 281, 297, 313, 323, 580, , 584
ESP10, 252, 279, 296, 311, 322, 582, , 586
ESP10, 255, 281, 297, 314, 323, 585, , 589
ESP10, 254, 284, 296, 313, 325, 587, , 591
ESP10, 253, 283, 294, 310, 323, 590, , 594
ESP10, 255, 288, 299, 312, 324, 592, , 596
ESP10, 253, 288, 298, 311, 323, 595, , 599
ESP10, 254, 289, 300, 312, 323, 597, , 601
ESP10, 261, 293, 304, 318, 329, 600, , 604
ESP10, 264, 298, 308, 322, 333, 602, , 606
ESP10, 268, 299, 311, 325, 333, 605, , 609
ESP10, 268, 296, 311, 324, 331, 608, , 612
ESP10, 270, 295, 309, 323, 329, 610, , 614
ESP10, 274, 295, 313, 324, 329, 613, , 617
ESP10, 273, 295, 315, 324, 330, 615, , 619
ESP10, 272, 292, 312, 323, 331, 618, , 622
ESP10, 274, 293, 312, 323, 331, 620, , 624
ESP10, 276, 294, 311, 324, 331, 623, , 627
ESP10, 276, 293, 307, 322, 328, 625, , 629
ESP10, 276, 293, 307, 319, 325, 628, , 632
ESP10, 276, 294, 309, 319, 326, 630, , 634
ESP10, 274, 290, 305, 317, 324, 633, , 637
ESP10, 278, 290, 308, 318, 327, 635, , 639
ESP10, 279, 287, 308, 317, 325, 638, , 642
ESP10, 280, 291, 311, 319, 327, 640, , 644
ESP10, 283, 296, 313, 322, 329, 643, , 647
ESP10, 288, 300, 318, 327, 334, 645, , 649
ESP10, 282, 295, 313, 322, 330, 648, , 652
ESP10, 280, 293, 309, 319, 327, 650, , 654
ESP10, 284, 299, 310, 318, 326, 653, , 657
ESP10, 279, 297, 307, 315, 322, 655, , 659
ESP10, 280, 296, 307, 316, 324, 658, , 662
ESP10, 277, 291, 304, 311, 320, 660, , 664
ESP10, 278, 291, 303, 311, 319, 663, , 667
ESP10, 281, 293, 304, 313, 319, 665, , 669
ESP10, 284, 295, 307, 315, 323, 668, , 672
ESP10, 277, 288, 301, 309, 316, 670, , 674
ESP10, 282, 291, 304, 313, 319, 673, , 677
ESP10, 280, 288, 303, 311, 319, 675, , 679
ESP10, 281, 289, 302, 310, 319, 678, , 682
ESP10, 282, 292, 303, 314, 320, 680, , 684
ESP10, 283, 290, 300, 313, 319, 683, , 687
ESP10, 284, 293, 303, 313, 320, 685, , 689
ESP10, 290, 300, 308, 319, 325, 688, , 692
ESP10, 293, 304, 311, 322, 328, 690, , 694
ESP10, 294, 305, 312, 322, 330, 693, , 697
ESP10, 293, 305, 313, 321, 328, 695, , 699
ESP10, 300, 314, 321, 329, 336, 698, , 702
ESP10, 301, 315, 324, 331, 336, 700, , 704
ESP10, 310, 320, 330, 337, 343, 703, , 707
ESP10, 311, 317, 327, 335, 340, 705, , 709
ESP10, 312, 318, 327, 335, 340, 708, , 712
ESP10, 315, 321, 330, 337, 341, 710, , 714
ESP10, 316, 322, 331, 338, 342, 713, , 717
ESP10, 313, 320, 328, 336, 341, 715, , 719
ESP10, 313, 320, 330, 336, 341, 718, , 722
ESP10, 316, 325, 333, 339, 344, 720, , 724
ESP10, 317, 327, 334, 341, 345, 723, , 727
ESP10, 315, 326, 333, 340, 344, 725, , 729
ESP10, 317, 328, 335, 341, 346, 728, , 732
ESP10, 313, 324, 332, 337, 344, 730, , 734
ESP10, 324, 333, 341, 345, 353, 733, , 737
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Data Files
/chpsesp/ensemble/natural/GCDW1N_SQIN.ESPF10.csv
GCDW1N_SQIN.ESPF0.csv|2026-06-23
GCDW1N_SQIN.ESPF10.csv|2026-06-23
GCDW1N_SQIN.ESPFM.csv|2026-06-23
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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