Allegheny County weather alerts
There are no active weather alerts for Allegheny County, PA right now.
Since 2016 the National Weather Service has issued about 1,278 alerts that included Allegheny County, roughly 128 a year. The most common is the severe thunderstorm warning (404 from 2016 to 2025). The last tornado warning was issued on August 2, 2026. 28 tornadoes have touched down in the county since 1950.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
No warnings, watches or advisories include Allegheny County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Beaver County, Butler County, Washington County, Westmoreland County.
Allegheny County alert history
Alert events that included Allegheny County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 404 | 56 | October 16, 2026 |
| Flood Advisory | 192 | 6 | September 4, 2026 |
| Flash Flood Warning | 160 | 28 | September 12, 2026 |
| Flood Warning | 92 | 8 | October 11, 2026 |
| Severe Thunderstorm Watch | 69 | 14 | September 9, 2026 |
| Winter Weather Advisory | 66 | 1 | March 16, 2026 |
| Flood Watch | 49 | 15 | September 20, 2026 |
| Frost Advisory | 32 | 6 | October 22, 2026 |
| Wind Advisory | 31 | 2 | March 15, 2026 |
| Dense Fog Advisory | 29 | 6 | August 21, 2026 |
| Snow Squall Warning | 28 | 14 | February 7, 2026 |
| Tornado Warning | 19 | 4 | August 2, 2026 |
| Freeze Warning | 15 | 3 | October 18, 2026 |
| Tornado Watch | 14 | 4 | June 14, 2026 |
| Cold Weather Advisory | 13 | 9 | February 9, 2026 |
| Freeze Watch | 12 | 2 | October 18, 2026 |
| Heat Advisory | 12 | 3 | September 2, 2026 |
| Winter Storm Warning | 11 | 1 | January 25, 2026 |
| Winter Storm Watch | 8 | 1 | January 25, 2026 |
| High Wind Watch | 6 | 0 | April 1, 2023 |
| Red Flag Warning | 3 | 0 | April 12, 2023 |
| High Wind Warning | 3 | 1 | March 13, 2026 |
| Extreme Heat Watch | 3 | 0 | June 22, 2025 |
| Fire Weather Watch | 2 | 0 | April 12, 2023 |
| Extreme Cold Watch | 2 | 1 | January 27, 2026 |
| Extreme Heat Warning | 2 | 1 | June 30, 2026 |
| Extreme Cold Warning | 1 | 1 | January 27, 2026 |
Tornado history in Allegheny County
28 tornadoes have been recorded in Allegheny County since 1950, killing 2 people and injuring 275. That ranks 8 of 67 counties in Pennsylvania. The most recent was on November 20, 2024 (rated EF0).
Strongest tornadoes in Allegheny County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 3, 1980 | F4 | Allegheny County | 11.8 mi | 10 yd | 0 | 140 |
| August 3, 1963 | F3 | Allegheny County | 0.1 mi | 10 yd | 2 | 70 |
| June 4, 1975 | F2 | Beaver County | 45.3 mi | 30 yd | 0 | 0 |
| May 22, 1983 | F2 | Allegheny County | 38 mi | 200 yd | 0 | 10 |
| May 13, 1956 | F2 | Allegheny County | 0.7 mi | 200 yd | 0 | 5 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| November 20, 2024 | EF0 | Allegheny County | 1 mi | 75 yd | 0 | 0 |
| June 26, 2024 | EF1 | Allegheny County | 11.5 mi | 300 yd | 0 | 0 |
| June 26, 2024 | EF1 | Washington County | 6.8 mi | 100 yd | 0 | 0 |
| May 17, 2024 | EF1 | Allegheny County | 1.9 mi | 125 yd | 0 | 0 |
| May 17, 2024 | EF0 | Washington County | 5.9 mi | 75 yd | 0 | 0 |
About Allegheny County
- Population: 1,231,814 (2024 estimate)
- State: Pennsylvania
- NOAA Weather Radio SAME code: 042003 (how to use it)
- Cities: Pittsburgh