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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:
2026-04-29
Issued:
2026-04-29
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
60963
64151
103
69920
62538
APR-JUL
49033
51689
98
56113
52578
APR-AUG
56798
59390
101
65152
58757
JAN-SEP
73117
76304
107
82073
71301
JAN-JUL
61186
63842
104
68266
61341
OCT-SEP
83011
86199
107
91968
80441
Experimental
HEFS with 15 days EQPF
Ensemble:
2026-04-29
Issued:
2026-04-29
Hide Forecast
APR-SEP
61999
65441
105
70813
62538
APR-JUL
49752
52783
100
57409
52578
APR-AUG
58072
60576
103
66172
58757
JAN-SEP
74152
77595
109
82967
71301
JAN-JUL
61905
64936
106
69562
61341
OCT-SEP
84047
87489
109
92861
80441
Reference
ESP with 0 Days QPF
Ensemble:
2026-04-29
Issued:
2026-04-29
Hide Forecast
APR-SEP
62352
65592
105
70660
62538
APR-JUL
49407
52185
99
57392
52578
APR-AUG
57597
60665
103
66077
58757
JAN-SEP
74505
77745
109
82813
71301
JAN-JUL
61560
64339
105
69546
61341
OCT-SEP
84400
87640
109
92708
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, 74, , 78
ESP10, 229, 295, 351, 404, 433, 77, , 81
ESP10, 227, 298, 350, 402, 432, 81, , 85
ESP10, 226, 298, 349, 399, 429, 84, , 88
ESP10, 223, 296, 347, 396, 431, 87, , 91
ESP10, 229, 300, 348, 396, 437, 90, , 94
ESP10, 232, 301, 354, 397, 438, 93, , 97
ESP10, 233, 303, 355, 399, 439, 96, , 100
ESP10, 233, 303, 353, 397, 439, 100, , 104
ESP10, 236, 308, 356, 399, 439, 103, , 107
ESP10, 235, 308, 357, 401, 439, 106, , 110
ESP10, 229, 301, 350, 395, 434, 109, , 113
ESP10, 231, 304, 354, 397, 437, 112, , 116
ESP10, 232, 303, 352, 396, 437, 115, , 119
ESP10, 220, 292, 338, 386, 428, 119, , 123
ESP10, 210, 284, 329, 380, 418, 122, , 126
ESP10, 220, 294, 343, 390, 429, 125, , 129
ESP10, 220, 294, 346, 390, 431, 128, , 132
ESP10, 220, 294, 349, 395, 434, 131, , 135
ESP10, 209, 285, 343, 386, 425, 134, , 138
ESP10, 209, 287, 342, 387, 424, 138, , 142
ESP10, 203, 288, 336, 385, 425, 141, , 145
ESP10, 210, 297, 347, 394, 434, 144, , 148
ESP10, 214, 302, 351, 398, 436, 147, , 151
ESP10, 219, 315, 355, 404, 441, 150, , 154
ESP10, 222, 315, 356, 405, 442, 153, , 157
ESP10, 224, 314, 356, 405, 442, 156, , 160
ESP10, 214, 304, 348, 398, 434, 160, , 164
ESP10, 199, 289, 336, 386, 423, 163, , 167
ESP10, 200, 289, 339, 388, 428, 166, , 170
ESP10, 204, 293, 342, 391, 434, 169, , 173
ESP10, 203, 290, 340, 390, 433, 172, , 176
ESP10, 213, 302, 350, 398, 442, 175, , 179
ESP10, 221, 305, 351, 398, 443, 179, , 183
ESP10, 222, 305, 351, 399, 441, 182, , 186
ESP10, 223, 304, 351, 397, 440, 185, , 189
ESP10, 217, 294, 346, 388, 433, 188, , 192
ESP10, 224, 299, 353, 393, 440, 191, , 195
ESP10, 222, 300, 355, 391, 440, 194, , 198
ESP10, 227, 302, 356, 389, 439, 198, , 202
ESP10, 229, 302, 353, 393, 436, 201, , 205
ESP10, 239, 309, 362, 401, 443, 204, , 208
ESP10, 249, 318, 367, 402, 448, 207, , 211
ESP10, 242, 313, 358, 392, 438, 210, , 214
ESP10, 250, 316, 363, 397, 442, 213, , 217
ESP10, 243, 307, 355, 391, 438, 217, , 221
ESP10, 250, 312, 363, 397, 448, 220, , 224
ESP10, 245, 306, 360, 394, 443, 223, , 227
ESP10, 248, 307, 363, 395, 447, 226, , 230
ESP10, 253, 310, 363, 396, 446, 229, , 233
ESP10, 254, 316, 359, 396, 442, 232, , 236
ESP10, 251, 317, 361, 392, 438, 236, , 240
ESP10, 260, 326, 370, 403, 445, 239, , 243
ESP10, 255, 321, 364, 402, 439, 242, , 246
ESP10, 257, 318, 361, 401, 442, 245, , 249
ESP10, 255, 314, 356, 397, 438, 248, , 252
ESP10, 257, 313, 355, 400, 439, 251, , 255
ESP10, 257, 316, 361, 405, 440, 254, , 258
ESP10, 249, 302, 352, 395, 429, 258, , 262
ESP10, 238, 292, 342, 388, 420, 261, , 265
ESP10, 241, 293, 343, 388, 422, 264, , 268
ESP10, 237, 286, 336, 380, 415, 267, , 271
ESP10, 221, 266, 317, 362, 404, 270, , 274
ESP10, 224, 270, 325, 366, 410, 273, , 277
ESP10, 220, 269, 322, 361, 410, 277, , 281
ESP10, 228, 277, 331, 369, 417, 280, , 284
ESP10, 215, 263, 318, 355, 404, 283, , 287
ESP10, 188, 236, 289, 328, 379, 286, , 290
ESP10, 180, 230, 281, 319, 373, 289, , 293
ESP10, 178, 238, 282, 318, 374, 292, , 296
ESP10, 185, 250, 288, 326, 383, 296, , 300
ESP10, 186, 251, 291, 329, 385, 299, , 303
ESP10, 180, 242, 286, 321, 379, 302, , 306
ESP10, 186, 240, 294, 320, 378, 305, , 309
ESP10, 190, 240, 295, 323, 379, 308, , 312
ESP10, 192, 241, 301, 324, 381, 311, , 315
ESP10, 190, 240, 298, 321, 378, 315, , 319
ESP10, 183, 233, 289, 315, 370, 318, , 322
ESP10, 189, 232, 282, 311, 366, 321, , 325
ESP10, 201, 240, 288, 318, 371, 324, , 328
ESP10, 206, 241, 287, 316, 371, 327, , 331
ESP10, 218, 253, 298, 325, 382, 330, , 334
ESP10, 223, 256, 300, 330, 385, 333, , 337
ESP10, 218, 248, 295, 328, 381, 337, , 341
ESP10, 213, 245, 291, 330, 379, 340, , 344
ESP10, 215, 247, 296, 330, 380, 343, , 347
ESP10, 221, 252, 298, 332, 391, 346, , 350
ESP10, 217, 253, 295, 328, 389, 349, , 353
ESP10, 223, 256, 299, 329, 389, 352, , 356
ESP10, 230, 264, 307, 334, 391, 356, , 360
ESP10, 226, 265, 305, 331, 387, 359, , 363
ESP10, 220, 259, 304, 326, 385, 362, , 366
ESP10, 221, 261, 305, 328, 390, 365, , 369
ESP10, 212, 256, 297, 321, 384, 368, , 372
ESP10, 210, 266, 300, 323, 385, 371, , 375
ESP10, 213, 264, 303, 323, 384, 375, , 379
ESP10, 212, 262, 299, 326, 382, 378, , 382
ESP10, 214, 262, 297, 325, 379, 381, , 385
ESP10, 215, 259, 292, 326, 375, 384, , 388
ESP10, 214, 257, 290, 328, 373, 387, , 391
ESP10, 217, 255, 292, 331, 374, 390, , 394
ESP10, 217, 253, 291, 330, 371, 394, , 398
ESP10, 215, 257, 292, 327, 368, 397, , 401
ESP10, 218, 256, 293, 325, 367, 400, , 404
ESP10, 220, 260, 295, 325, 366, 403, , 407
ESP10, 220, 263, 294, 324, 365, 406, , 410
ESP10, 221, 265, 296, 326, 366, 409, , 413
ESP10, 222, 269, 297, 324, 365, 412, , 416
ESP10, 233, 278, 306, 333, 373, 416, , 420
ESP10, 240, 284, 308, 337, 374, 419, , 423
ESP10, 245, 290, 313, 341, 378, 422, , 426
ESP10, 244, 291, 315, 342, 378, 425, , 429
ESP10, 248, 295, 321, 346, 382, 428, , 432
ESP10, 248, 295, 320, 347, 381, 431, , 435
ESP10, 245, 290, 316, 343, 376, 435, , 439
ESP10, 249, 298, 319, 347, 379, 438, , 442
ESP10, 250, 303, 319, 350, 380, 441, , 445
ESP10, 254, 304, 320, 351, 380, 444, , 448
ESP10, 253, 306, 322, 351, 382, 447, , 451
ESP10, 251, 304, 323, 350, 382, 450, , 454
ESP10, 244, 294, 314, 341, 375, 454, , 458
ESP10, 238, 286, 306, 334, 369, 457, , 461
ESP10, 245, 290, 310, 336, 373, 460, , 464
ESP10, 251, 291, 312, 337, 376, 463, , 467
ESP10, 250, 289, 311, 336, 374, 466, , 470
ESP10, 249, 285, 307, 331, 369, 469, , 473
ESP10, 257, 297, 313, 339, 376, 473, , 477
ESP10, 258, 294, 311, 338, 372, 476, , 480
ESP10, 256, 292, 314, 338, 369, 479, , 483
ESP10, 259, 297, 317, 341, 370, 482, , 486
ESP10, 261, 300, 322, 341, 369, 485, , 489
ESP10, 255, 294, 317, 335, 363, 488, , 492
ESP10, 258, 297, 320, 339, 365, 491, , 495
ESP10, 255, 296, 316, 339, 361, 495, , 499
ESP10, 242, 284, 303, 329, 348, 498, , 502
ESP10, 243, 284, 302, 329, 350, 501, , 505
ESP10, 249, 290, 310, 334, 357, 504, , 508
ESP10, 241, 279, 303, 322, 346, 507, , 511
ESP10, 253, 287, 313, 331, 355, 510, , 514
ESP10, 248, 282, 306, 327, 349, 514, , 518
ESP10, 258, 289, 311, 333, 356, 517, , 521
ESP10, 256, 286, 309, 331, 354, 520, , 524
ESP10, 263, 291, 315, 336, 361, 523, , 527
ESP10, 268, 291, 315, 338, 362, 526, , 530
ESP10, 270, 293, 316, 340, 365, 529, , 533
ESP10, 269, 294, 318, 339, 364, 533, , 537
ESP10, 264, 290, 312, 332, 358, 536, , 540
ESP10, 261, 287, 309, 326, 353, 539, , 543
ESP10, 256, 281, 300, 316, 343, 542, , 546
ESP10, 259, 283, 303, 319, 342, 545, , 549
ESP10, 258, 278, 301, 315, 337, 548, , 552
ESP10, 251, 271, 294, 309, 329, 552, , 556
ESP10, 247, 266, 292, 303, 325, 555, , 559
ESP10, 240, 263, 288, 298, 320, 558, , 562
ESP10, 241, 266, 286, 299, 317, 561, , 565
ESP10, 230, 255, 274, 287, 306, 564, , 568
ESP10, 233, 258, 275, 291, 310, 567, , 571
ESP10, 215, 243, 255, 275, 295, 571, , 575
ESP10, 231, 256, 270, 288, 308, 574, , 578
ESP10, 230, 257, 270, 289, 308, 577, , 581
ESP10, 225, 254, 267, 285, 303, 580, , 584
ESP10, 221, 248, 258, 278, 295, 583, , 587
ESP10, 229, 254, 264, 286, 301, 586, , 590
ESP10, 225, 251, 260, 280, 300, 589, , 593
ESP10, 221, 246, 257, 275, 296, 593, , 597
ESP10, 217, 240, 251, 269, 293, 596, , 600
ESP10, 220, 241, 255, 270, 295, 599, , 603
ESP10, 216, 237, 252, 271, 292, 602, , 606
ESP10, 217, 238, 252, 272, 295, 605, , 609
ESP10, 219, 234, 250, 268, 291, 608, , 612
ESP10, 226, 240, 253, 269, 295, 612, , 616
ESP10, 226, 239, 254, 267, 293, 615, , 619
ESP10, 216, 231, 246, 260, 283, 618, , 622
ESP10, 213, 228, 244, 258, 280, 621, , 625
ESP10, 216, 234, 251, 266, 286, 624, , 628
ESP10, 215, 236, 252, 266, 286, 627, , 631
ESP10, 217, 239, 257, 272, 290, 631, , 635
ESP10, 220, 243, 259, 278, 293, 634, , 638
ESP10, 225, 247, 264, 282, 297, 637, , 641
ESP10, 233, 254, 271, 290, 303, 640, , 644
ESP10, 235, 258, 272, 291, 305, 643, , 647
ESP10, 234, 258, 270, 288, 303, 646, , 650
ESP10, 238, 264, 279, 292, 309, 650, , 654
ESP10, 236, 264, 283, 295, 309, 653, , 657
ESP10, 232, 260, 279, 293, 309, 656, , 660
ESP10, 231, 260, 278, 294, 307, 659, , 663
ESP10, 234, 265, 282, 297, 310, 662, , 666
ESP10, 233, 263, 279, 296, 309, 665, , 669
ESP10, 229, 257, 272, 290, 302, 668, , 672
ESP10, 224, 254, 268, 286, 297, 672, , 676
ESP10, 223, 253, 268, 285, 296, 675, , 679
ESP10, 227, 258, 274, 291, 302, 678, , 682
ESP10, 232, 261, 276, 293, 304, 681, , 685
ESP10, 231, 262, 272, 290, 299, 684, , 688
ESP10, 240, 272, 279, 297, 308, 687, , 691
ESP10, 240, 270, 276, 294, 305, 691, , 695
ESP10, 243, 272, 280, 298, 308, 694, , 698
ESP10, 239, 266, 279, 294, 304, 697, , 701
ESP10, 241, 268, 281, 296, 306, 700, , 704
ESP10, 244, 270, 284, 299, 309, 703, , 707
ESP10, 244, 271, 286, 302, 310, 706, , 710
ESP10, 245, 272, 287, 304, 312, 710, , 714
ESP10, 254, 281, 297, 313, 323, 713, , 717
ESP10, 252, 279, 296, 311, 322, 716, , 720
ESP10, 255, 281, 297, 314, 323, 719, , 723
ESP10, 254, 284, 296, 313, 325, 722, , 726
ESP10, 253, 283, 294, 310, 323, 725, , 729
ESP10, 255, 288, 299, 312, 324, 729, , 733
ESP10, 253, 288, 298, 311, 323, 732, , 736
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Scale To Last 45 Days
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ESP10
HEFS
ESP0
Data Files
/chpsesp/ensemble/natural/GCDW1N_SQIN.ESPF10.csv
GCDW1N_SQIN.ESPF0.csv|2026-04-29
GCDW1N_SQIN.ESPF10.csv|2026-04-29
GCDW1N_SQIN.ESPFM.csv|2026-04-29
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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