Hydrologic Outlook
None

ESFOTX A slow moving storm system will bring 12 to 15 hours of rain to Central Washington Saturday night through Sunday night. Potential rain amounts will vary from half an inch to up to two inches. This will bring an elevated risk for debris flows over sensitive burn scars within steep terrain as well as isolated rock slides. The potential hazard threat will increase slowly throughout the event as soils become saturated. The probability for an inch or more of rain ranges from 40-50% for the Modrite, Kaiser Canyon, Chelan Hills, and Labor Mountain burn scars and between 15-30% for Sinlahekin, Sisi, and Little Giant burn scars.

Similkameen River Near Nighthawk, Wa Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011
01-01 1012.57
01-02 961.86
01-03 920.13
01-04 920.88
01-05 909.75
01-06 939.78
01-07 971.88
01-08 1012.75
01-09 982.63
01-10 953.0
01-11 941.0
01-12 942.75
01-13 942.14
01-14 1370.57
01-15 1410.86
01-16 1327.0
01-17 1187.88
01-18 1166.25
01-19 1153.63
01-20 1128.75
01-21 1060.13
01-22 982.44
01-23 940.63
01-24 891.8
01-25 895.11
01-26 1022.11
01-27 1025.8
01-28 1004.82
01-29 1031.82
01-30 946.0
01-31 929.15
02-01 1018.33
02-02 1034.83
02-03 1086.38
02-04 1033.92
02-05 1033.0
02-06 983.75
02-07 1062.0
02-08 1185.0
02-09 1066.0
02-10 1196.0
02-11 1227.11
02-12 1198.5
02-13 1181.3
02-14 1182.3
02-15 1120.73
02-16 1215.7
02-17 1124.3
02-18 1116.1
02-19 1065.27
02-20 1098.7
02-21 981.91
02-22 957.0
02-23 1027.7
02-24 996.73
02-25 928.4
02-26 898.36
02-27 906.0
02-28 895.58
02-29 842.5
03-01 844.09
03-02 873.08
03-03 872.5
03-04 862.75
03-05 886.46
03-06 884.62
03-07 883.92
03-08 880.92
03-09 888.62
03-10 932.23
03-11 920.31
03-12 936.31
03-13 944.38
03-14 925.43
03-15 936.71
03-16 1029.93
03-17 1023.64
03-18 1068.77
03-19 1087.47
03-20 1184.57
03-21 1340.07
03-22 1596.07
03-23 1467.47
03-24 1421.67
03-25 1416.47
03-26 1425.33
03-27 1445.13
03-28 1508.67
03-29 1618.4
03-30 1662.53
03-31 1695.5
04-01 1749.73
04-02 1752.87
04-03 1815.93
04-04 1940.67
04-05 2104.5
04-06 2094.5
04-07 2076.14
04-08 2141.87
04-09 2329.69
04-10 2448.27
04-11 2536.2
04-12 2728.57
04-13 2802.86
04-14 2801.64
04-15 2412.69
04-16 2432.85
04-17 2512.75
04-18 2513.31
04-19 2676.85
04-20 2941.92
04-21 3841.64
04-22 4274.5
04-23 4702.21
04-24 4911.93
04-25 5147.54
04-26 5127.43
04-27 5285.71
04-28 5436.43
04-29 5594.29
04-30 5874.62
05-01 5708.0
05-02 6141.43
05-03 6510.71
05-04 7125.33
05-05 7717.33
05-06 8665.33
05-07 9219.33
05-08 9217.86
05-09 9620.67
05-10 8488.57
05-11 10127.33
05-12 10095.33
05-13 10346.67
05-14 10583.85
05-15 11264.17
05-16 11328.46
05-17 11762.86
05-18 11788.67
05-19 11874.29
05-20 11072.86
05-21 10444.29
05-22 9964.0
05-23 10168.67
05-24 10158.67
05-25 10200.0
05-26 9702.67
05-27 9376.0
05-28 9037.33
05-29 9003.33
05-30 9064.0
05-31 8969.33
06-01 9016.67
06-02 8767.86
06-03 8692.67
06-04 8672.67
06-05 8179.29
06-06 8020.0
06-07 7955.71
06-08 7679.29
06-09 7690.0
06-10 7509.33
06-11 7449.29
06-12 7078.57
06-13 6790.71
06-14 6969.29
06-15 6650.0
06-16 6217.33
06-17 5904.67
06-18 5891.33
06-19 6007.86
06-20 5875.0
06-21 5839.29
06-22 5970.71
06-23 5930.0
06-24 5902.14
06-25 5740.0
06-26 5540.71
06-27 5267.14
06-28 5080.71
06-29 4912.86
06-30 4859.29
07-01 4683.57
07-02 4420.0
07-03 4266.43
07-04 4197.08
07-05 3779.87
07-06 3491.13
07-07 3446.5
07-08 3373.21
07-09 3267.86
07-10 3001.13
07-11 2929.43
07-12 2822.29
07-13 2632.57
07-14 2459.6
07-15 2328.93
07-16 2125.07
07-17 2077.93
07-18 2052.71
07-19 1952.33
07-20 1882.4
07-21 1788.53
07-22 1768.57
07-23 1683.79
07-24 1539.0
07-25 1517.87
07-26 1444.07
07-27 1397.4
07-28 1334.4
07-29 1255.13
07-30 1241.93
07-31 1124.8
08-01 1063.38
08-02 1039.57
08-03 970.6
08-04 957.2
08-05 915.2
08-06 884.0
08-07 848.33
08-08 844.86
08-09 812.14
08-10 810.77
08-11 731.73
08-12 708.2
08-13 714.93
08-14 669.07
08-15 646.33
08-16 658.36
08-17 645.0
08-18 619.23
08-19 582.29
08-20 561.64
08-21 538.71
08-22 524.36
08-23 510.2
08-24 523.69
08-25 506.29
08-26 493.53
08-27 482.07
08-28 465.13
08-29 454.8
08-30 449.47
08-31 459.71
09-01 466.6
09-02 455.07
09-03 448.47
09-04 441.07
09-05 437.13
09-06 433.0
09-07 434.73
09-08 517.87
09-09 500.2
09-10 470.0
09-11 449.87
09-12 438.67
09-13 440.92
09-14 434.5
09-15 428.5
09-16 442.31
09-17 431.93
09-18 452.07
09-19 451.93
09-20 471.36
09-21 483.15
09-22 476.43
09-23 462.93
09-24 454.36
09-25 461.0
09-26 478.71
09-27 483.21
09-28 509.62
09-29 542.86
09-30 584.46
10-01 619.67
10-02 593.69
10-03 621.58
10-04 581.62
10-05 583.64
10-06 569.21
10-07 557.64
10-08 561.79
10-09 569.93
10-10 601.93
10-11 624.43
10-12 639.14
10-13 618.64
10-14 621.14
10-15 639.69
10-16 629.54
10-17 645.57
10-18 674.29
10-19 708.77
10-20 789.46
10-21 850.15
10-22 804.07
10-23 759.86
10-24 776.0
10-25 777.21
10-26 720.0
10-27 778.07
10-28 745.46
10-29 822.07
10-30 817.14
10-31 989.0
11-01 1018.38
11-02 1037.71
11-03 1153.77
11-04 1193.57
11-05 1155.79
11-06 1518.46
11-07 1480.58
11-08 1323.54
11-09 1234.31
11-10 1142.15
11-11 1090.54
11-12 1081.23
11-13 1009.92
11-14 1257.36
11-15 1327.38
11-16 2480.46
11-17 2899.82
11-18 1838.08
11-19 1686.83
11-20 1595.77
11-21 1460.92
11-22 1336.54
11-23 1312.25
11-24 1289.42
11-25 1268.92
11-26 1496.0
11-27 1329.5
11-28 1305.54
11-29 1513.08
11-30 1708.75
12-01 1541.5
12-02 1820.67
12-03 1905.17
12-04 1677.08
12-05 1537.58
12-06 1447.73
12-07 1727.44
12-08 1446.55
12-09 1418.73
12-10 1427.0
12-11 1383.18
12-12 2251.82
12-13 1795.73
12-14 1711.1
12-15 1543.73
12-16 1607.82
12-17 1921.36
12-18 1884.1
12-19 1641.09
12-20 1550.55
12-21 1421.25
12-22 1312.3
12-23 1246.0
12-24 1146.2
12-25 1097.1
12-26 1056.89
12-27 1018.2
12-28 1006.11
12-29 965.33
12-30 945.86
12-31 981.75

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index