Overview Realtime Historical Map View
Heat Advisory
2026-07-20T20:00:00-05:00

* WHAT...Heat index values up to 104 expected. * WHERE...Portions of northwest Iowa and south central and southeast South Dakota. * WHEN...From 11 AM this morning to 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

East Fork Vermillion River Near Parker, Sd Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011
03-08 225.0
03-09 145.5
03-10 162.0
03-11 166.5
03-12 430.0
03-13 414.33
03-14 327.23
03-15 202.42
03-16 197.16
03-17 172.68
03-18 151.02
03-19 146.48
03-20 604.0
03-21 488.66
03-22 457.53
03-23 430.63
03-24 350.4
03-25 276.71
03-26 246.5
03-27 217.88
03-28 207.71
03-29 184.68
03-30 182.68
03-31 176.95
04-01 167.32
04-02 143.98
04-03 133.17
04-04 119.03
04-05 114.4
04-06 122.67
04-07 182.75
04-08 221.97
04-09 89.03
04-10 179.73
04-11 83.42
04-12 152.71
04-13 178.05
04-14 162.08
04-15 162.31
04-16 199.92
04-17 236.49
04-18 225.02
04-19 209.9
04-20 210.07
04-21 178.63
04-22 178.86
04-23 205.95
04-24 194.22
04-25 134.65
04-26 170.2
04-27 150.8
04-28 171.64
04-29 168.96
04-30 165.4
05-01 206.05
05-02 227.51
05-03 230.15
05-04 188.03
05-05 172.51
05-06 158.38
05-07 213.26
05-08 317.61
05-09 354.08
05-10 344.58
05-11 268.77
05-12 248.4
05-13 224.35
05-14 211.42
05-15 196.29
05-16 182.44
05-17 169.81
05-18 158.07
05-19 168.58
05-20 162.59
05-21 149.83
05-22 163.55
05-23 180.29
05-24 176.93
05-25 202.22
05-26 203.25
05-27 273.25
05-28 280.85
05-29 269.64
05-30 364.75
05-31 290.64
06-01 225.19
06-02 204.64
06-03 194.55
06-04 183.1
06-05 184.46
06-06 170.34
06-07 151.0
06-08 129.8
06-09 125.64
06-10 133.8
06-11 127.16
06-12 124.88
06-13 120.97
06-14 116.71
06-15 123.59
06-16 120.79
06-17 148.73
06-18 150.18
06-19 186.22
06-20 147.37
06-21 132.61
06-22 143.3
06-23 141.22
06-24 138.04
06-25 135.21
06-26 116.63
06-27 119.79
06-28 125.51
06-29 139.54
06-30 131.28
07-01 114.84
07-02 117.16
07-03 108.2
07-04 118.79
07-05 123.09
07-06 136.69
07-07 219.3
07-08 192.62
07-09 160.21
07-10 134.14
07-11 123.16
07-12 109.14
07-13 71.82
07-14 97.77
07-15 97.1
07-16 98.85
07-17 96.46
07-18 110.09
07-19 94.75
07-20 89.17
07-21 95.99
07-22 93.96
07-23 89.87
07-24 94.42
07-25 90.27
07-26 87.93
07-27 86.44
07-28 87.66
07-29 93.78
07-30 101.93
07-31 102.47
08-01 51.82
08-02 116.37
08-03 103.66
08-04 97.04
08-05 89.28
08-06 87.56
08-07 83.52
08-08 83.89
08-09 79.26
08-10 79.96
08-11 74.68
08-12 73.64
08-13 72.96
08-14 69.91
08-15 71.97
08-16 35.09
08-17 35.96
08-18 38.37
08-19 70.0
08-20 68.1
08-21 66.07
08-22 70.07
08-23 65.57
08-24 70.15
08-25 73.85
08-26 79.27
08-27 77.61
08-28 72.45
08-29 69.44
08-30 62.55
08-31 34.18
09-01 58.56
09-02 57.79
09-03 56.97
09-04 54.28
09-05 53.55
09-06 50.91
09-07 49.2
09-08 48.36
09-09 49.98
09-10 53.91
09-11 79.64
09-12 431.46
09-13 371.11
09-14 416.24
09-15 276.54
09-16 221.28
09-17 210.13
09-18 176.32
09-19 155.91
09-20 147.07
09-21 338.76
09-22 194.6
09-23 145.89
09-24 124.18
09-25 112.09
09-26 109.39
09-27 105.73
09-28 101.23
09-29 96.32
09-30 99.69
10-01 92.57
10-02 89.08
10-03 112.32
10-04 102.29
10-05 93.71
10-06 98.67
10-07 99.44
10-08 93.39
10-09 93.18
10-10 107.0
10-11 132.28
10-12 121.43
10-13 111.84
10-14 106.64
10-15 118.16
10-16 91.13
10-17 105.82
10-18 102.88
10-19 100.7
10-20 88.22
10-21 87.11
10-22 95.07
10-23 92.72
10-24 93.84
10-25 91.7
10-26 95.65
10-27 92.05
10-28 88.4
10-29 85.22
10-30 80.83
10-31 88.95
11-01 86.82
11-02 92.62
11-03 85.4
11-04 84.24
11-05 80.05
11-06 35.66
11-07 39.16
11-08 36.52
11-09 34.37
11-10 36.4
11-11 39.18
11-12 39.96
11-13 35.23
11-14 35.46
11-15 31.5
11-16 31.77
11-17 34.3
11-18 46.95
11-19 48.4
11-20 49.5
11-21 30.31
11-22 28.1
11-23 28.79
11-24 39.08
11-25 38.03
11-26 45.97
11-27 47.93
11-28 44.27
11-29 42.23
11-30 42.17
12-01 34.5
12-02 37.15
12-03 33.85
12-04 35.25
12-05 32.25
12-06 31.6
12-07 5.13
12-08 7.38
12-09 7.38
12-10 6.52
12-11 5.7
12-12 7.08
12-13 6.0

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index