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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:
2026-05-12
Issued:
2026-05-12
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
60697
63025
101
67003
62538
APR-JUL
48319
50724
96
53645
52578
APR-AUG
56142
58340
99
62111
58757
JAN-SEP
72850
75178
105
79156
71301
JAN-JUL
60473
62877
103
65798
61341
OCT-SEP
82745
85073
106
89051
80441
Experimental
HEFS with 15 days EQPF
Ensemble:
2026-05-12
Issued:
2026-05-12
Hide Forecast
APR-SEP
61135
64039
102
68847
62538
APR-JUL
49080
51499
98
55940
52578
APR-AUG
56682
59253
101
64145
58757
JAN-SEP
73288
76192
107
81000
71301
JAN-JUL
61234
63652
104
68093
61341
OCT-SEP
83182
86087
107
90895
80441
Reference
ESP with 0 Days QPF
Ensemble:
2026-05-12
Issued:
2026-05-12
Hide Forecast
APR-SEP
61010
64126
103
69859
62538
APR-JUL
49027
51587
98
56378
52578
APR-AUG
56473
59493
101
64989
58757
JAN-SEP
73163
76279
107
82013
71301
JAN-JUL
61180
63741
104
68531
61341
OCT-SEP
83058
86174
107
91907
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, 80, , 84
ESP10, 226, 298, 349, 399, 429, 83, , 87
ESP10, 223, 296, 347, 396, 431, 86, , 90
ESP10, 229, 300, 348, 396, 437, 89, , 93
ESP10, 232, 301, 354, 397, 438, 92, , 96
ESP10, 233, 303, 355, 399, 439, 95, , 99
ESP10, 233, 303, 353, 397, 439, 98, , 102
ESP10, 236, 308, 356, 399, 439, 101, , 105
ESP10, 235, 308, 357, 401, 439, 104, , 108
ESP10, 229, 301, 350, 395, 434, 107, , 111
ESP10, 231, 304, 354, 397, 437, 110, , 114
ESP10, 232, 303, 352, 396, 437, 113, , 117
ESP10, 220, 292, 338, 386, 428, 116, , 120
ESP10, 210, 284, 329, 380, 418, 119, , 123
ESP10, 220, 294, 343, 390, 429, 122, , 126
ESP10, 220, 294, 346, 390, 431, 125, , 129
ESP10, 220, 294, 349, 395, 434, 128, , 132
ESP10, 209, 285, 343, 386, 425, 131, , 135
ESP10, 209, 287, 342, 387, 424, 134, , 138
ESP10, 203, 288, 336, 385, 425, 136, , 140
ESP10, 210, 297, 347, 394, 434, 139, , 143
ESP10, 214, 302, 351, 398, 436, 142, , 146
ESP10, 219, 315, 355, 404, 441, 145, , 149
ESP10, 222, 315, 356, 405, 442, 148, , 152
ESP10, 224, 314, 356, 405, 442, 151, , 155
ESP10, 214, 304, 348, 398, 434, 154, , 158
ESP10, 199, 289, 336, 386, 423, 157, , 161
ESP10, 200, 289, 339, 388, 428, 160, , 164
ESP10, 204, 293, 342, 391, 434, 163, , 167
ESP10, 203, 290, 340, 390, 433, 166, , 170
ESP10, 213, 302, 350, 398, 442, 169, , 173
ESP10, 221, 305, 351, 398, 443, 172, , 176
ESP10, 222, 305, 351, 399, 441, 175, , 179
ESP10, 223, 304, 351, 397, 440, 178, , 182
ESP10, 217, 294, 346, 388, 433, 181, , 185
ESP10, 224, 299, 353, 393, 440, 184, , 188
ESP10, 222, 300, 355, 391, 440, 187, , 191
ESP10, 227, 302, 356, 389, 439, 190, , 194
ESP10, 229, 302, 353, 393, 436, 193, , 197
ESP10, 239, 309, 362, 401, 443, 196, , 200
ESP10, 249, 318, 367, 402, 448, 199, , 203
ESP10, 242, 313, 358, 392, 438, 202, , 206
ESP10, 250, 316, 363, 397, 442, 205, , 209
ESP10, 243, 307, 355, 391, 438, 208, , 212
ESP10, 250, 312, 363, 397, 448, 211, , 215
ESP10, 245, 306, 360, 394, 443, 214, , 218
ESP10, 248, 307, 363, 395, 447, 217, , 221
ESP10, 253, 310, 363, 396, 446, 220, , 224
ESP10, 254, 316, 359, 396, 442, 223, , 227
ESP10, 251, 317, 361, 392, 438, 226, , 230
ESP10, 260, 326, 370, 403, 445, 229, , 233
ESP10, 255, 321, 364, 402, 439, 232, , 236
ESP10, 257, 318, 361, 401, 442, 235, , 239
ESP10, 255, 314, 356, 397, 438, 238, , 242
ESP10, 257, 313, 355, 400, 439, 241, , 245
ESP10, 257, 316, 361, 405, 440, 244, , 248
ESP10, 249, 302, 352, 395, 429, 247, , 251
ESP10, 238, 292, 342, 388, 420, 250, , 254
ESP10, 241, 293, 343, 388, 422, 253, , 257
ESP10, 237, 286, 336, 380, 415, 256, , 260
ESP10, 221, 266, 317, 362, 404, 259, , 263
ESP10, 224, 270, 325, 366, 410, 262, , 266
ESP10, 220, 269, 322, 361, 410, 265, , 269
ESP10, 228, 277, 331, 369, 417, 268, , 272
ESP10, 215, 263, 318, 355, 404, 270, , 274
ESP10, 188, 236, 289, 328, 379, 273, , 277
ESP10, 180, 230, 281, 319, 373, 276, , 280
ESP10, 178, 238, 282, 318, 374, 279, , 283
ESP10, 185, 250, 288, 326, 383, 282, , 286
ESP10, 186, 251, 291, 329, 385, 285, , 289
ESP10, 180, 242, 286, 321, 379, 288, , 292
ESP10, 186, 240, 294, 320, 378, 291, , 295
ESP10, 190, 240, 295, 323, 379, 294, , 298
ESP10, 192, 241, 301, 324, 381, 297, , 301
ESP10, 190, 240, 298, 321, 378, 300, , 304
ESP10, 183, 233, 289, 315, 370, 303, , 307
ESP10, 189, 232, 282, 311, 366, 306, , 310
ESP10, 201, 240, 288, 318, 371, 309, , 313
ESP10, 206, 241, 287, 316, 371, 312, , 316
ESP10, 218, 253, 298, 325, 382, 315, , 319
ESP10, 223, 256, 300, 330, 385, 318, , 322
ESP10, 218, 248, 295, 328, 381, 321, , 325
ESP10, 213, 245, 291, 330, 379, 324, , 328
ESP10, 215, 247, 296, 330, 380, 327, , 331
ESP10, 221, 252, 298, 332, 391, 330, , 334
ESP10, 217, 253, 295, 328, 389, 333, , 337
ESP10, 223, 256, 299, 329, 389, 336, , 340
ESP10, 230, 264, 307, 334, 391, 339, , 343
ESP10, 226, 265, 305, 331, 387, 342, , 346
ESP10, 220, 259, 304, 326, 385, 345, , 349
ESP10, 221, 261, 305, 328, 390, 348, , 352
ESP10, 212, 256, 297, 321, 384, 351, , 355
ESP10, 210, 266, 300, 323, 385, 354, , 358
ESP10, 213, 264, 303, 323, 384, 357, , 361
ESP10, 212, 262, 299, 326, 382, 360, , 364
ESP10, 214, 262, 297, 325, 379, 363, , 367
ESP10, 215, 259, 292, 326, 375, 366, , 370
ESP10, 214, 257, 290, 328, 373, 369, , 373
ESP10, 217, 255, 292, 331, 374, 372, , 376
ESP10, 217, 253, 291, 330, 371, 375, , 379
ESP10, 215, 257, 292, 327, 368, 378, , 382
ESP10, 218, 256, 293, 325, 367, 381, , 385
ESP10, 220, 260, 295, 325, 366, 384, , 388
ESP10, 220, 263, 294, 324, 365, 387, , 391
ESP10, 221, 265, 296, 326, 366, 390, , 394
ESP10, 222, 269, 297, 324, 365, 393, , 397
ESP10, 233, 278, 306, 333, 373, 396, , 400
ESP10, 240, 284, 308, 337, 374, 399, , 403
ESP10, 245, 290, 313, 341, 378, 402, , 406
ESP10, 244, 291, 315, 342, 378, 404, , 408
ESP10, 248, 295, 321, 346, 382, 407, , 411
ESP10, 248, 295, 320, 347, 381, 410, , 414
ESP10, 245, 290, 316, 343, 376, 413, , 417
ESP10, 249, 298, 319, 347, 379, 416, , 420
ESP10, 250, 303, 319, 350, 380, 419, , 423
ESP10, 254, 304, 320, 351, 380, 422, , 426
ESP10, 253, 306, 322, 351, 382, 425, , 429
ESP10, 251, 304, 323, 350, 382, 428, , 432
ESP10, 244, 294, 314, 341, 375, 431, , 435
ESP10, 238, 286, 306, 334, 369, 434, , 438
ESP10, 245, 290, 310, 336, 373, 437, , 441
ESP10, 251, 291, 312, 337, 376, 440, , 444
ESP10, 250, 289, 311, 336, 374, 443, , 447
ESP10, 249, 285, 307, 331, 369, 446, , 450
ESP10, 257, 297, 313, 339, 376, 449, , 453
ESP10, 258, 294, 311, 338, 372, 452, , 456
ESP10, 256, 292, 314, 338, 369, 455, , 459
ESP10, 259, 297, 317, 341, 370, 458, , 462
ESP10, 261, 300, 322, 341, 369, 461, , 465
ESP10, 255, 294, 317, 335, 363, 464, , 468
ESP10, 258, 297, 320, 339, 365, 467, , 471
ESP10, 255, 296, 316, 339, 361, 470, , 474
ESP10, 242, 284, 303, 329, 348, 473, , 477
ESP10, 243, 284, 302, 329, 350, 476, , 480
ESP10, 249, 290, 310, 334, 357, 479, , 483
ESP10, 241, 279, 303, 322, 346, 482, , 486
ESP10, 253, 287, 313, 331, 355, 485, , 489
ESP10, 248, 282, 306, 327, 349, 488, , 492
ESP10, 258, 289, 311, 333, 356, 491, , 495
ESP10, 256, 286, 309, 331, 354, 494, , 498
ESP10, 263, 291, 315, 336, 361, 497, , 501
ESP10, 268, 291, 315, 338, 362, 500, , 504
ESP10, 270, 293, 316, 340, 365, 503, , 507
ESP10, 269, 294, 318, 339, 364, 506, , 510
ESP10, 264, 290, 312, 332, 358, 509, , 513
ESP10, 261, 287, 309, 326, 353, 512, , 516
ESP10, 256, 281, 300, 316, 343, 515, , 519
ESP10, 259, 283, 303, 319, 342, 518, , 522
ESP10, 258, 278, 301, 315, 337, 521, , 525
ESP10, 251, 271, 294, 309, 329, 524, , 528
ESP10, 247, 266, 292, 303, 325, 527, , 531
ESP10, 240, 263, 288, 298, 320, 530, , 534
ESP10, 241, 266, 286, 299, 317, 533, , 537
ESP10, 230, 255, 274, 287, 306, 536, , 540
ESP10, 233, 258, 275, 291, 310, 538, , 542
ESP10, 215, 243, 255, 275, 295, 541, , 545
ESP10, 231, 256, 270, 288, 308, 544, , 548
ESP10, 230, 257, 270, 289, 308, 547, , 551
ESP10, 225, 254, 267, 285, 303, 550, , 554
ESP10, 221, 248, 258, 278, 295, 553, , 557
ESP10, 229, 254, 264, 286, 301, 556, , 560
ESP10, 225, 251, 260, 280, 300, 559, , 563
ESP10, 221, 246, 257, 275, 296, 562, , 566
ESP10, 217, 240, 251, 269, 293, 565, , 569
ESP10, 220, 241, 255, 270, 295, 568, , 572
ESP10, 216, 237, 252, 271, 292, 571, , 575
ESP10, 217, 238, 252, 272, 295, 574, , 578
ESP10, 219, 234, 250, 268, 291, 577, , 581
ESP10, 226, 240, 253, 269, 295, 580, , 584
ESP10, 226, 239, 254, 267, 293, 583, , 587
ESP10, 216, 231, 246, 260, 283, 586, , 590
ESP10, 213, 228, 244, 258, 280, 589, , 593
ESP10, 216, 234, 251, 266, 286, 592, , 596
ESP10, 215, 236, 252, 266, 286, 595, , 599
ESP10, 217, 239, 257, 272, 290, 598, , 602
ESP10, 220, 243, 259, 278, 293, 601, , 605
ESP10, 225, 247, 264, 282, 297, 604, , 608
ESP10, 233, 254, 271, 290, 303, 607, , 611
ESP10, 235, 258, 272, 291, 305, 610, , 614
ESP10, 234, 258, 270, 288, 303, 613, , 617
ESP10, 238, 264, 279, 292, 309, 616, , 620
ESP10, 236, 264, 283, 295, 309, 619, , 623
ESP10, 232, 260, 279, 293, 309, 622, , 626
ESP10, 231, 260, 278, 294, 307, 625, , 629
ESP10, 234, 265, 282, 297, 310, 628, , 632
ESP10, 233, 263, 279, 296, 309, 631, , 635
ESP10, 229, 257, 272, 290, 302, 634, , 638
ESP10, 224, 254, 268, 286, 297, 637, , 641
ESP10, 223, 253, 268, 285, 296, 640, , 644
ESP10, 227, 258, 274, 291, 302, 643, , 647
ESP10, 232, 261, 276, 293, 304, 646, , 650
ESP10, 231, 262, 272, 290, 299, 649, , 653
ESP10, 240, 272, 279, 297, 308, 652, , 656
ESP10, 240, 270, 276, 294, 305, 655, , 659
ESP10, 243, 272, 280, 298, 308, 658, , 662
ESP10, 239, 266, 279, 294, 304, 661, , 665
ESP10, 241, 268, 281, 296, 306, 664, , 668
ESP10, 244, 270, 284, 299, 309, 667, , 671
ESP10, 244, 271, 286, 302, 310, 670, , 674
ESP10, 245, 272, 287, 304, 312, 672, , 676
ESP10, 254, 281, 297, 313, 323, 675, , 679
ESP10, 252, 279, 296, 311, 322, 678, , 682
ESP10, 255, 281, 297, 314, 323, 681, , 685
ESP10, 254, 284, 296, 313, 325, 684, , 688
ESP10, 253, 283, 294, 310, 323, 687, , 691
ESP10, 255, 288, 299, 312, 324, 690, , 694
ESP10, 253, 288, 298, 311, 323, 693, , 697
ESP10, 254, 289, 300, 312, 323, 696, , 700
ESP10, 261, 293, 304, 318, 329, 699, , 703
ESP10, 264, 298, 308, 322, 333, 702, , 706
ESP10, 268, 299, 311, 325, 333, 705, , 709
ESP10, 268, 296, 311, 324, 331, 708, , 712
ESP10, 270, 295, 309, 323, 329, 711, , 715
ESP10, 274, 295, 313, 324, 329, 714, , 718
ESP10, 273, 295, 315, 324, 330, 717, , 721
ESP10, 272, 292, 312, 323, 331, 720, , 724
ESP10, 274, 293, 312, 323, 331, 723, , 727
ESP10, 276, 294, 311, 324, 331, 726, , 730
ESP10, 276, 293, 307, 322, 328, 729, , 733
ESP10, 276, 293, 307, 319, 325, 732, , 736
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ESP10
HEFS
ESP0
Data Files
/chpsesp/ensemble/natural/GCDW1N_SQIN.ESPF10.csv
GCDW1N_SQIN.ESPF0.csv|2026-05-12
GCDW1N_SQIN.ESPF10.csv|2026-05-12
GCDW1N_SQIN.ESPFM.csv|2026-05-12
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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