Overview Realtime Historical Map View
Extreme Heat Warning
2026-09-04T19:00:00-05:00

* WHAT...Dangerously hot conditions with heat index values up to around 105. Expect minimal relief overnight with lows in the mid 70s. * WHERE...Portions of central, east central, southeast, and west central Illinois. * WHEN...Until 7 PM CDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Lake Fork At Atwood, Il Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011
01-01 374.73
01-02 307.57
01-03 220.77
01-04 159.28
01-05 138.09
01-06 102.39
01-07 85.72
01-08 79.8
01-09 71.84
01-10 104.17
01-11 181.69
01-12 252.21
01-13 305.64
01-14 290.92
01-15 190.13
01-16 129.69
01-17 95.77
01-18 69.68
01-19 177.79
01-20 156.31
01-21 112.15
01-22 75.47
01-23 78.48
01-24 185.87
01-25 293.14
01-26 278.56
01-27 266.86
01-28 196.19
01-29 178.02
01-30 157.6
01-31 123.5
02-01 107.04
02-02 121.67
02-03 116.74
02-04 164.9
02-05 128.16
02-06 98.48
02-07 97.5
02-08 153.05
02-09 97.64
02-10 109.59
02-11 138.77
02-12 124.72
02-13 125.98
02-14 89.97
02-15 82.98
02-16 78.83
02-17 53.75
02-18 193.46
02-19 243.54
02-20 110.45
02-21 263.02
02-22 349.49
02-23 366.86
02-24 210.35
02-25 158.75
02-26 97.94
02-27 118.16
02-28 127.39
02-29 65.0
03-01 135.62
03-02 110.51
03-03 120.45
03-04 95.88
03-05 105.78
03-06 113.86
03-07 97.19
03-08 145.83
03-09 125.5
03-10 188.14
03-11 202.87
03-12 220.2
03-13 205.13
03-14 215.41
03-15 228.21
03-16 179.96
03-17 149.49
03-18 116.69
03-19 173.18
03-20 211.8
03-21 159.03
03-22 84.2
03-23 98.94
03-24 97.84
03-25 94.5
03-26 109.66
03-27 129.85
03-28 132.32
03-29 139.33
03-30 159.16
03-31 290.78
04-01 353.71
04-02 324.93
04-03 283.39
04-04 246.98
04-05 213.46
04-06 243.16
04-07 222.02
04-08 181.34
04-09 139.01
04-10 148.81
04-11 145.88
04-12 195.12
04-13 162.23
04-14 141.41
04-15 198.3
04-16 164.8
04-17 208.72
04-18 184.7
04-19 410.34
04-20 387.58
04-21 274.82
04-22 188.99
04-23 146.55
04-24 123.62
04-25 170.34
04-26 175.74
04-27 189.9
04-28 219.71
04-29 289.27
04-30 428.38
05-01 410.67
05-02 320.77
05-03 309.02
05-04 280.47
05-05 295.47
05-06 276.23
05-07 237.88
05-08 224.44
05-09 247.69
05-10 327.24
05-11 280.88
05-12 234.1
05-13 195.86
05-14 157.13
05-15 144.59
05-16 141.52
05-17 153.35
05-18 232.39
05-19 248.11
05-20 268.71
05-21 217.15
05-22 176.45
05-23 174.15
05-24 157.76
05-25 147.76
05-26 137.75
05-27 212.57
05-28 188.41
05-29 188.95
05-30 185.57
05-31 154.99
06-01 162.09
06-02 186.59
06-03 170.19
06-04 143.09
06-05 198.95
06-06 181.89
06-07 142.59
06-08 114.45
06-09 134.33
06-10 133.5
06-11 125.64
06-12 180.93
06-13 195.19
06-14 150.74
06-15 139.58
06-16 151.35
06-17 145.22
06-18 179.04
06-19 211.7
06-20 183.28
06-21 171.21
06-22 161.0
06-23 212.96
06-24 200.46
06-25 165.68
06-26 232.7
06-27 375.94
06-28 415.35
06-29 348.31
06-30 254.02
07-01 196.74
07-02 192.23
07-03 142.45
07-04 101.84
07-05 77.59
07-06 77.5
07-07 75.19
07-08 65.0
07-09 101.89
07-10 105.69
07-11 83.32
07-12 43.14
07-13 79.49
07-14 76.69
07-15 69.43
07-16 55.47
07-17 58.09
07-18 46.77
07-19 37.14
07-20 38.57
07-21 31.4
07-22 27.68
07-23 35.16
07-24 28.59
07-25 23.54
07-26 29.02
07-27 28.77
07-28 23.7
07-29 23.31
07-30 20.54
07-31 19.39
08-01 18.61
08-02 17.07
08-03 15.66
08-04 15.58
08-05 16.34
08-06 16.34
08-07 16.38
08-08 17.02
08-09 17.68
08-10 15.82
08-11 17.59
08-12 16.61
08-13 18.63
08-14 18.72
08-15 21.6
08-16 30.08
08-17 36.59
08-18 34.66
08-19 27.68
08-20 24.39
08-21 33.2
08-22 34.49
08-23 27.31
08-24 25.62
08-25 24.64
08-26 21.42
08-27 24.89
08-28 23.95
08-29 28.02
08-30 26.49
08-31 21.27
09-01 22.78
09-02 18.36
09-03 16.69
09-04 14.03
09-05 16.32
09-06 10.04
09-07 10.25
09-08 16.26
09-09 31.69
09-10 32.12
09-11 31.98
09-12 16.78
09-13 12.75
09-14 11.41
09-15 10.71
09-16 11.55
09-17 12.95
09-18 12.53
09-19 12.18
09-20 11.85
09-21 11.07
09-22 10.92
09-23 12.59
09-24 12.55
09-25 11.69
09-26 11.95
09-27 10.76
09-28 10.31
09-29 9.87
09-30 11.1
10-01 11.01
10-02 9.56
10-03 11.18
10-04 14.68
10-05 16.43
10-06 17.42
10-07 16.33
10-08 19.61
10-09 17.51
10-10 17.71
10-11 18.25
10-12 18.71
10-13 22.43
10-14 23.1
10-15 34.58
10-16 40.99
10-17 37.37
10-18 32.43
10-19 32.72
10-20 28.57
10-21 42.14
10-22 40.57
10-23 34.12
10-24 19.35
10-25 78.04
10-26 126.05
10-27 106.46
10-28 83.81
10-29 93.26
10-30 93.22
10-31 85.82
11-01 91.89
11-02 78.25
11-03 70.79
11-04 57.99
11-05 50.76
11-06 49.73
11-07 49.62
11-08 45.59
11-09 42.87
11-10 41.5
11-11 41.2
11-12 46.76
11-13 34.34
11-14 36.48
11-15 36.07
11-16 34.99
11-17 33.77
11-18 33.48
11-19 34.05
11-20 33.46
11-21 33.66
11-22 35.08
11-23 32.85
11-24 34.18
11-25 63.14
11-26 58.64
11-27 67.97
11-28 54.3
11-29 76.09
11-30 64.35
12-01 64.73
12-02 75.55
12-03 70.87
12-04 56.33
12-05 47.96
12-06 42.04
12-07 47.24
12-08 33.94
12-09 32.27
12-10 30.49
12-11 30.94
12-12 52.5
12-13 43.36
12-14 42.05
12-15 42.44
12-16 50.0
12-17 52.41
12-18 42.57
12-19 40.52
12-20 32.77
12-21 35.1
12-22 62.69
12-23 59.17
12-24 94.04
12-25 90.85
12-26 72.24
12-27 214.59
12-28 327.27
12-29 96.57
12-30 495.75
12-31 349.83

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index