Overview Realtime Historical Map View
Extreme Heat Warning
2026-07-16T00:00:00-06:00

* WHAT...Very hot daytime temperatures combined with warm overnight lows will produce cumulative heat stress. * WHERE...Portions of southeast Montana and north central Wyoming. * WHEN...Until midnight MDT Wednesday Night. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...It will be very hot today and Wednesday with high temperatures of 98 to 105. Very warm nighttime temps will provide only limited relief.

Powder River At Arvada, Wy Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011
02-06 907.0
02-13 572.0
02-14 392.0
02-15 368.0
02-16 333.0
02-18 267.0
02-19 257.0
02-20 251.0
02-21 241.0
02-24 231.0
02-25 209.0
02-26 145.0
02-27 294.0
02-28 310.0
03-01 288.0
03-02 226.0
03-03 339.0
03-04 424.0
03-05 374.0
03-06 319.0
03-07 289.0
03-08 225.0
03-09 290.0
03-10 242.0
03-11 296.33
03-12 302.2
03-13 302.6
03-14 303.4
03-15 281.6
03-16 254.86
03-17 264.44
03-18 281.1
03-19 266.1
03-20 267.5
03-21 245.82
03-22 228.09
03-23 239.25
03-24 252.31
03-25 241.62
03-26 236.08
03-27 261.15
03-28 283.15
03-29 256.08
03-30 256.54
03-31 259.92
04-01 270.31
04-02 265.62
04-03 269.77
04-04 310.2
04-05 282.6
04-06 310.21
04-07 301.64
04-08 266.29
04-09 270.58
04-10 283.43
04-11 270.07
04-12 273.77
04-13 328.14
04-14 372.36
04-15 342.0
04-16 310.0
04-17 304.67
04-18 292.5
04-19 274.85
04-20 271.69
04-21 264.14
04-22 270.07
04-23 274.92
04-24 339.92
04-25 375.08
04-26 325.21
04-27 434.43
04-28 423.64
04-29 454.64
04-30 501.29
05-01 427.6
05-02 340.79
05-03 375.62
05-04 453.93
05-05 435.29
05-06 423.85
05-07 383.92
05-08 394.77
05-09 468.06
05-10 613.52
05-11 664.97
05-12 602.4
05-13 460.61
05-14 474.66
05-15 595.26
05-16 553.51
05-17 500.59
05-18 545.37
05-19 655.32
05-20 642.94
05-21 660.94
05-22 710.72
05-23 764.1
05-24 715.63
05-25 752.75
05-26 1186.51
05-27 1273.97
05-28 1222.14
05-29 1013.71
05-30 1362.57
05-31 1613.75
06-01 1362.35
06-02 1244.88
06-03 965.85
06-04 733.65
06-05 1105.14
06-06 1450.21
06-07 909.73
06-08 784.87
06-09 742.44
06-10 678.23
06-11 665.91
06-12 621.18
06-13 610.56
06-14 605.54
06-15 707.07
06-16 714.79
06-17 690.22
06-18 669.17
06-19 793.0
06-20 579.69
06-21 610.32
06-22 600.15
06-23 573.22
06-24 661.49
06-25 327.46
06-26 313.41
06-27 380.08
06-28 405.48
06-29 474.29
06-30 439.93
07-01 353.01
07-02 376.87
07-03 340.65
07-04 320.92
07-05 282.86
07-06 295.74
07-07 357.44
07-08 385.87
07-09 368.06
07-10 296.27
07-11 268.32
07-12 223.62
07-13 202.84
07-14 190.38
07-15 205.04
07-16 280.48
07-17 185.28
07-18 178.96
07-19 158.16
07-20 163.49
07-21 141.46
07-22 136.78
07-23 123.99
07-24 109.92
07-25 102.14
07-26 122.99
07-27 94.0
07-28 94.7
07-29 175.69
07-30 120.14
07-31 102.72
08-01 97.16
08-02 92.33
08-03 127.57
08-04 113.11
08-05 91.09
08-06 83.26
08-07 85.56
08-08 79.05
08-09 193.96
08-10 175.79
08-11 130.91
08-12 104.45
08-13 85.38
08-14 103.0
08-15 81.76
08-16 79.7
08-17 65.77
08-18 62.46
08-19 64.23
08-20 62.4
08-21 57.55
08-22 56.26
08-23 61.95
08-24 83.39
08-25 96.1
08-26 66.35
08-27 62.66
08-28 60.69
08-29 61.17
08-30 51.92
08-31 45.29
09-01 47.42
09-02 50.1
09-03 48.68
09-04 55.01
09-05 51.14
09-06 43.74
09-07 45.05
09-08 44.71
09-09 55.96
09-10 51.92
09-11 61.85
09-12 55.22
09-13 49.7
09-14 49.33
09-15 57.96
09-16 59.22
09-17 61.91
09-18 61.5
09-19 63.19
09-20 63.6
09-21 67.33
09-22 71.3
09-23 73.26
09-24 72.78
09-25 75.02
09-26 90.08
09-27 115.53
09-28 103.7
09-29 89.63
09-30 89.05
10-01 91.99
10-02 95.18
10-03 98.9
10-04 99.59
10-05 102.68
10-06 142.47
10-07 147.39
10-08 143.14
10-09 149.3
10-10 276.98
10-11 203.88
10-12 177.3
10-13 166.55
10-14 162.45
10-15 381.55
10-16 223.64
10-17 181.31
10-18 175.24
10-19 175.71
10-20 175.94
10-21 177.16
10-22 189.34
10-23 186.01
10-24 184.08
10-25 172.71
10-26 176.54
10-27 169.2
10-28 173.92
10-29 172.69
10-30 170.41
10-31 171.28
11-01 169.44
11-02 168.25
11-03 163.28
11-04 160.98
11-05 163.87
11-06 162.05
11-07 162.44
11-08 166.53
11-09 152.88
11-10 161.97
11-11 161.59
11-12 158.82
11-13 165.03
11-14 160.96
11-15 160.71
11-16 160.99
11-17 164.59
11-18 140.62
11-19 175.61
11-20 252.04
11-21 171.54
11-22 184.96
11-23 164.87
11-24 148.38
11-25 123.51
11-26 165.4
11-27 188.2
11-28 241.4
11-29 276.4
11-30 224.25
12-01 192.33
12-02 177.67
12-03 173.5
12-04 312.67
12-05 264.5
12-06 178.25
12-07 526.5
12-08 248.5
12-09 292.5
12-10 187.0
12-11 206.0
12-12 180.0
12-13 176.0
12-14 314.0
12-15 262.0
12-16 206.0
12-17 252.0
12-18 243.0
12-19 257.0

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index