Overview Realtime Historical Map View
Flood Watch
2026-09-13T01:00:00-04:00

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of east central Ohio, including the following areas, Belmont, Guernsey, Jefferson OH, Monroe and Noble, Pennsylvania, including the following areas, Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette, Forest, Greene, Higher Elevations of Fayette, Higher Elevations of Indiana, Higher Elevations of Westmoreland, Indiana, Jefferson PA, Lawrence, Mercer, Venango, Washington and Westmoreland, and West Virginia, including the following areas, Brooke, Eastern Preston, Eastern Tucker, Hancock, Marion, Marshall, Monongalia, Ohio, Preston, Ridges of Eastern Monongalia and Northwestern Preston, Western Tucker and Wetzel. * WHEN...Until 1 AM EDT Sunday. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Wet soils and continued rainfall will continue to create problems for the next few hours. - http://www.weather.gov/safety/flood

Allegheny River At Natrona, Pa 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 36850.0
01-02 38950.0
01-03 36808.33
01-04 35991.67
01-05 34133.33
01-06 33663.64
01-07 29766.67
01-08 27866.67
01-09 25083.33
01-10 25650.0
01-11 28283.33
01-12 30758.33
01-13 33483.33
01-14 35316.67
01-15 35050.0
01-16 31941.67
01-17 30776.92
01-18 29023.08
01-19 28982.31
01-20 27784.62
01-21 27507.69
01-22 24546.15
01-23 23250.0
01-24 22766.92
01-25 25246.92
01-26 29150.83
01-27 29773.33
01-28 31935.0
01-29 31937.5
01-30 29790.0
01-31 28473.33
02-01 28647.5
02-02 26653.33
02-03 24607.69
02-04 24099.23
02-05 25198.46
02-06 24252.5
02-07 25510.0
02-08 26038.46
02-09 26304.62
02-10 22976.92
02-11 25502.73
02-12 23824.17
02-13 24606.15
02-14 24311.54
02-15 23642.31
02-16 25651.67
02-17 26701.67
02-18 27337.5
02-19 32971.67
02-20 30549.23
02-21 30930.0
02-22 30244.29
02-23 30556.43
02-24 31531.43
02-25 28903.85
02-26 31681.54
02-27 33682.14
02-28 35743.57
02-29 36750.0
03-01 37489.29
03-02 39735.0
03-03 39430.0
03-04 36022.86
03-05 35978.57
03-06 33328.57
03-07 34025.0
03-08 32408.57
03-09 32214.29
03-10 30900.0
03-11 31035.71
03-12 32585.71
03-13 34207.14
03-14 34742.86
03-15 35271.43
03-16 34614.29
03-17 33742.86
03-18 32535.71
03-19 32357.14
03-20 30700.0
03-21 31886.67
03-22 27057.14
03-23 26953.33
03-24 26306.67
03-25 25613.33
03-26 24686.67
03-27 24766.67
03-28 25653.33
03-29 27213.33
03-30 28220.0
03-31 29264.29
04-01 30500.0
04-02 35213.33
04-03 36100.0
04-04 37500.0
04-05 38500.0
04-06 39028.57
04-07 37878.0
04-08 37592.0
04-09 38670.0
04-10 37052.67
04-11 36261.33
04-12 37037.14
04-13 38634.29
04-14 35865.0
04-15 33293.85
04-16 32293.85
04-17 32014.62
04-18 31695.38
04-19 29657.69
04-20 30041.54
04-21 28465.71
04-22 29935.0
04-23 27662.14
04-24 25445.0
04-25 23216.92
04-26 22913.57
04-27 25570.71
04-28 25226.43
04-29 23146.43
04-30 22157.14
05-01 26506.67
05-02 27250.0
05-03 27385.71
05-04 28433.33
05-05 31780.0
05-06 31826.67
05-07 32580.0
05-08 29846.43
05-09 31342.67
05-10 31264.67
05-11 31220.0
05-12 29000.0
05-13 27060.0
05-14 28946.67
05-15 28542.86
05-16 28112.14
05-17 30530.71
05-18 27426.67
05-19 25613.33
05-20 22985.71
05-21 22122.0
05-22 21028.67
05-23 23977.33
05-24 23348.67
05-25 21691.33
05-26 20725.33
05-27 20005.33
05-28 18622.0
05-29 19710.67
05-30 21850.67
05-31 21249.33
06-01 19505.33
06-02 18870.0
06-03 18672.0
06-04 17343.33
06-05 16251.43
06-06 14403.57
06-07 14247.86
06-08 13358.0
06-09 13281.33
06-10 13198.67
06-11 13933.33
06-12 13564.29
06-13 13182.86
06-14 14055.71
06-15 16206.67
06-16 17537.33
06-17 16784.67
06-18 18456.67
06-19 22095.0
06-20 23477.14
06-21 21635.0
06-22 22457.86
06-23 19078.57
06-24 17604.29
06-25 17257.86
06-26 20923.08
06-27 18282.14
06-28 17760.0
06-29 20761.43
06-30 19158.57
07-01 17837.86
07-02 18591.43
07-03 17657.86
07-04 16295.0
07-05 13911.33
07-06 13047.33
07-07 12486.43
07-08 12596.43
07-09 12984.29
07-10 11271.33
07-11 12405.71
07-12 12224.0
07-13 10727.14
07-14 11474.0
07-15 11216.67
07-16 10622.86
07-17 10108.67
07-18 10651.33
07-19 12574.67
07-20 12032.0
07-21 12940.0
07-22 11868.0
07-23 11939.33
07-24 10993.33
07-25 9738.0
07-26 9608.0
07-27 9000.67
07-28 9448.0
07-29 10191.33
07-30 8976.67
07-31 8295.33
08-01 7801.54
08-02 7235.33
08-03 7257.33
08-04 7276.67
08-05 6914.0
08-06 6782.67
08-07 6371.33
08-08 7410.71
08-09 6992.86
08-10 6502.86
08-11 6254.67
08-12 6962.0
08-13 7047.33
08-14 7650.67
08-15 8188.0
08-16 7777.86
08-17 7611.43
08-18 7719.23
08-19 7099.29
08-20 7824.29
08-21 8056.43
08-22 7582.31
08-23 8864.67
08-24 9075.71
08-25 8752.14
08-26 8976.0
08-27 7872.0
08-28 7206.0
08-29 8702.67
08-30 7570.67
08-31 7143.33
09-01 6591.33
09-02 7241.33
09-03 7213.33
09-04 7982.0
09-05 8683.33
09-06 8192.0
09-07 7498.67
09-08 7112.0
09-09 6778.0
09-10 9921.33
09-11 12289.33
09-12 11413.33
09-13 11217.86
09-14 11115.0
09-15 10364.29
09-16 9732.14
09-17 8922.86
09-18 8152.14
09-19 9069.29
09-20 8193.57
09-21 7223.57
09-22 7118.46
09-23 7155.0
09-24 7203.57
09-25 7407.14
09-26 7457.14
09-27 7847.86
09-28 9119.29
09-29 9146.43
09-30 10343.08
10-01 8120.0
10-02 7885.38
10-03 7459.23
10-04 7719.23
10-05 9870.71
10-06 9381.43
10-07 8765.0
10-08 9217.86
10-09 9757.69
10-10 8607.86
10-11 8385.0
10-12 8001.43
10-13 7702.86
10-14 7596.43
10-15 7713.08
10-16 8176.43
10-17 8542.14
10-18 9465.0
10-19 9680.71
10-20 9912.14
10-21 9515.38
10-22 11813.57
10-23 13168.57
10-24 12340.0
10-25 11958.57
10-26 12505.38
10-27 12125.71
10-28 12898.57
10-29 17339.29
10-30 20427.14
10-31 24492.14
11-01 26903.57
11-02 26651.43
11-03 26260.0
11-04 24200.71
11-05 20998.46
11-06 21655.38
11-07 22949.23
11-08 20783.85
11-09 19533.08
11-10 18558.46
11-11 17928.46
11-12 18056.15
11-13 20040.0
11-14 18652.14
11-15 17532.86
11-16 18187.14
11-17 18345.71
11-18 17182.31
11-19 19086.15
11-20 22690.0
11-21 19815.71
11-22 19240.0
11-23 18940.71
11-24 17385.38
11-25 17570.0
11-26 19342.14
11-27 19262.86
11-28 20214.29
11-29 20425.0
11-30 20354.29
12-01 20368.57
12-02 20734.29
12-03 20752.86
12-04 21594.29
12-05 22400.0
12-06 21715.38
12-07 23470.71
12-08 24665.71
12-09 24362.14
12-10 23199.29
12-11 24784.29
12-12 24670.71
12-13 22837.14
12-14 21292.31
12-15 20183.08
12-16 19707.69
12-17 19125.38
12-18 20790.0
12-19 22447.69
12-20 23253.33
12-21 24558.33
12-22 28769.23
12-23 34976.92
12-24 34107.69
12-25 34969.23
12-26 34880.0
12-27 33233.33
12-28 33633.33
12-29 31763.64
12-30 36925.0
12-31 37916.67

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index