Pennsylvania alerts

Allegheny County, Pennsylvania weather alerts

1 National Weather Service alert is in force for Allegheny County: a flood watch.

Checked Sun, Sep 20, 2026, 12:27 PM EDT. Times are Eastern Daylight Time.

Allegheny County forecastLive radar here

Warnings on the map

Every watch, warning and advisory the National Weather Service has in force over Allegheny County, Pennsylvania. Open it for the live map, where it pans and zooms.

Every watch, warning and advisory the National Weather Service has in force over Allegheny County, Pennsylvania Open the live map with warnings and watches

Map layer from NOAA National Weather Service. Boundaries from the Iowa Environmental Mesonet.

Alerts in force1

Every product in force for Allegheny County, worst first, with its full text.

Flood Watch

Severe

Flood Watch issued September 20 at 12:00PM EDT until September 21 at 12:00PM EDT by NWS Pittsburgh PA

Issued Until 23 hr 32 min left

Areas Tuscarawas, OH; Carroll, OH; Columbiana, OH; Coshocton, OH; Harrison, OH; Jefferson, OH; Muskingum, OH; Guernsey, OH; Belmont, OH; Noble, OH; Monroe, OH; Beaver, PA; Allegheny, PA; Washington, PA; Greene, PA; Westmoreland, PA; Westmoreland Ridges, PA; Fayette, PA; Fayette Ridges, PA; Hancock, WV; Brooke, WV; Ohio, WV; Marshall, WV; Wetzel, WV; Marion, WV; Monongalia, WV; Ridges of Eastern Monongalia and Northwestern Preston, WV; Preston, WV; Eastern Preston, WV; Western Tucker, WV; Eastern Tucker, WV

Full text

* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of east central Ohio, including the following areas, Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison, Jefferson OH, Monroe, Muskingum, Noble and Tuscarawas, Pennsylvania, including the following areas, Allegheny, Beaver, Fayette, Greene, Higher Elevations of Fayette, Higher Elevations of Westmoreland, 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...Through Monday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Additional rainfall of 1 to 2 inches is forecast across much of the watch area through Monday morning, with isolated totals of up to 3 inches possible. Combined with an already saturated ground, instances of flash flooding are possible. - http://www.weather.gov/safety/flood

What to do

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

NWS Pittsburgh PAShare this alert

The past year in Allegheny County

In the past year the National Weather Service issued 206 alerts for Allegheny County, including 55 severe thunderstorm warnings, 28 flash flood warnings, 21 snow squall warnings and 6 flood warnings.

ProductIssuedMost recent
Severe Thunderstorm Warning55Sep 13, 2026
Flash Flood Warning28Sep 12, 2026
Snow Squall Warning21Feb 6, 2026
Flood Warning6Sep 12, 2026
Tornado Warning4Aug 2, 2026
Freeze Warning3May 2, 2026
Winter Storm Warning2Jan 24, 2026
Extreme Cold Warning1Jan 26, 2026
Extreme Heat Warning1Jun 30, 2026
High Wind Warning1Mar 13, 2026
Flood Watch15Sep 20, 2026
Severe Thunderstorm Watch14Sep 9, 2026
Tornado Watch4Jun 14, 2026
Freeze Watch2Apr 20, 2026
Extreme Cold Watch1Jan 26, 2026
Winter Storm Watch1Jan 24, 2026
Dense Fog Advisory13Aug 21, 2026
Cold Weather Advisory9Feb 8, 2026
Frost Advisory8May 12, 2026
Flood Advisory6Sep 3, 2026
Winter Weather Advisory5Mar 16, 2026
Heat Advisory3Sep 2, 2026
Wind Advisory3Mar 16, 2026

Warnings issued

  1. Severe Thunderstorm Warning
  2. Flood Warning
  3. Flood Warning
  4. Flash Flood Warning
  5. Flash Flood Warning
  6. Severe Thunderstorm Warning
  7. Flash Flood Warning
  8. Severe Thunderstorm Warning
  9. Flash Flood Warning
  10. Severe Thunderstorm Warning
  11. Severe Thunderstorm Warning
  12. Flash Flood Warning
  13. Severe Thunderstorm Warning
  14. Severe Thunderstorm Warning
  15. Flash Flood Warning
  16. Severe Thunderstorm Warning
  17. Severe Thunderstorm Warning
  18. Severe Thunderstorm Warning
  19. Flash Flood Warning
  20. Severe Thunderstorm Warning
  21. Severe Thunderstorm Warning
  22. Severe Thunderstorm Warning
  23. Severe Thunderstorm Warning
  24. Severe Thunderstorm Warning
  25. Flash Flood Warning
  26. Severe Thunderstorm Warning
  27. Severe Thunderstorm Warning
  28. Flood Warning
  29. Flood Warning
  30. Flash Flood Warning
  31. Severe Thunderstorm Warning
  32. Severe Thunderstorm Warning
  33. Flash Flood Warning
  34. Severe Thunderstorm Warning
  35. Flash Flood Warning
  36. Severe Thunderstorm Warning
  37. Flash Flood Warning
  38. Severe Thunderstorm Warning
  39. Flood Warning
  40. Flash Flood Warning
  41. Flash Flood Warning
  42. Flash Flood Warning
  43. Flash Flood Warning
  44. Tornado Warning
  45. Severe Thunderstorm Warning
  46. Flash Flood Warning
  47. Severe Thunderstorm Warning
  48. Flash Flood Warning
  49. Severe Thunderstorm Warning
  50. Severe Thunderstorm Warning
  51. Flash Flood Warning
  52. Flash Flood Warning
  53. Severe Thunderstorm Warning
  54. Flash Flood Warning
  55. Flash Flood Warning
  56. Flash Flood Warning
  57. Flash Flood Warning
  58. Severe Thunderstorm Warning
  59. Severe Thunderstorm Warning
  60. Severe Thunderstorm Warning

And 62 earlier warnings.

Every alert, most recent first
  1. Flood Watch
  2. Severe Thunderstorm Warning
  3. Flood Warning
  4. Flood Warning
  5. Flash Flood Warning
  6. Flash Flood Warning
  7. Severe Thunderstorm Warning
  8. Flood Watch
  9. Flash Flood Warning
  10. Severe Thunderstorm Warning
  11. Severe Thunderstorm Watch
  12. Flood Watch
  13. Flash Flood Warning
  14. Severe Thunderstorm Warning
  15. Flood Advisory
  16. Severe Thunderstorm Warning
  17. Flash Flood Warning
  18. Severe Thunderstorm Warning
  19. Severe Thunderstorm Warning
  20. Flash Flood Warning
  21. Severe Thunderstorm Warning
  22. Severe Thunderstorm Warning
  23. Severe Thunderstorm Warning
  24. Flash Flood Warning
  25. Severe Thunderstorm Warning
  26. Severe Thunderstorm Watch
  27. Severe Thunderstorm Warning
  28. Severe Thunderstorm Warning
  29. Severe Thunderstorm Watch
  30. Heat Advisory
  31. Severe Thunderstorm Warning
  32. Severe Thunderstorm Warning
  33. Flash Flood Warning
  34. Severe Thunderstorm Warning
  35. Severe Thunderstorm Warning
  36. Severe Thunderstorm Watch
  37. Dense Fog Advisory
  38. Flood Warning
  39. Flood Warning
  40. Flash Flood Warning

The 40 most recent of 206.

From the Iowa Environmental Mesonet’s archive of NWS watches, warnings and advisories (VTEC), by the county’s own code and the forecast zones inside it. Each date links to the event at the IEM.

Nearby

The counties around Allegheny County, with what is in force in each.

What this means

Warning
The hazard is happening or about to. Act now: a tornado warning means take shelter, a flash flood warning means move to higher ground.
Watch
Conditions favor the hazard. Nothing is happening yet; have a plan and be ready to act if a warning follows.
Advisory
A hazard that is less serious than a warning but can still cause trouble, such as dense fog, heat or light ice.
Statement
Information about weather that does not yet meet a warning: a strong storm, a hydrologic update, or a special weather statement.

Severity (extreme, severe, moderate, minor) is the rating the issuing office gives each product. More on the difference: tornado watch vs. tornado warning. Alerts come from the National Weather Service; follow its instructions and your local officials.

Sources

Alerts from the National Weather Service's public feed, read afresh every minute, and matched to counties and zones by their UGC codes. Warnings from outside the United States come from each country's own meteorological service. Follow the issuing office's instructions and your local officials.