Alert archive / Pennsylvania / Washington County
Weather alerts in Washington County, Pennsylvania, 2024
177 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Washington County and its neighbors
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Alerts
- 177
- Warnings
- 76
- Watches
- 18
- Advisories
- 28
- Busiest month
- April37 alerts
- Busiest day
- May 25, 202410 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
4 of 7 tornado warnings covering Washington County in 2024 had a tornado report inside them; 1 of 4 tornado reports fell inside a warning, on average 4 minutes after it went out.
Washington County, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 7 | 4 | 43% | 4 | 25% | 4 min |
| Severe thunderstorm warnings | 46 | 33 | 28% | 33 | 70% | 16 min |
| Flash flood warnings | 11 | 9 | 18% | 21 | 95% | 126 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 37 | 14 | 62% | 58 | 60% | 10 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 283 | 206 | 27% | 917 | 85% | 20 min |
| NWS Pittsburgh, PA: flash flood warnings | 45 | 27 | 40% | 248 | 90% | 162 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 6, 12:22 PM EST | Special Weather Statement | PBZ | 83 min |
| Jan 6, 9:35 PM EST | Dense Fog Advisory | PBZ | 6 hr |
| Jan 8, 3:01 AM EST | Wind Advisory | PBZ | 62 hr |
| Jan 11, 1:28 PM EST | Wind Advisory | PBZ | 55 hr |
| Jan 14, 5:20 AM EST | Special Weather Statement | PBZ | 40 min |
| Jan 14, 6:00 AM EST | Special Weather Statement | PBZ | 90 min |
| Jan 14, 6:48 AM EST | Snow Squall Warning | PBZ | 42 min |
| Jan 14, 7:06 AM EST | Snow Squall Warning | PBZ | 39 min |
| Jan 16, 2:19 AM EST | Wind Chill Advisory | PBZ | 35 hr |
| Jan 18, 2:57 AM EST | Winter Weather Advisory | PBZ | 64 hr |
| Jan 19, 4:32 PM EST | Special Weather Statement | PBZ | 58 min |
| Jan 19, 5:33 PM EST | Special Weather Statement | PBZ | 57 min |
| Jan 20, 10:06 AM EST | Special Weather Statement | PBZ | 39 min |
| Jan 22, 3:57 AM EST | Winter Weather Advisory | PBZ | 32 hr |
| Jan 24, 8:07 PM EST | Dense Fog Advisory | PBZ | 25 hr |
| Feb 15, 2:06 PM EST | Special Weather Statement | PBZ | 54 min |
| Feb 15, 6:47 PM EST | Wind Advisory | PBZ | 6 hr |
| Feb 16, 3:02 AM EST | Winter Weather Advisory | PBZ | 28 hr |
| Feb 16, 7:40 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 28, 7:42 AM EST | Special Weather Statement | PBZ | 33 min |
| Feb 28, 7:55 AM EST | Severe Thunderstorm Warning | PBZ | 35 min |
| Feb 28, 8:07 AM EST | Areal Flood Advisory | PBZ | 102 min |
| Mar 3, 6:28 AM EST | Special Weather Statement | PBZ | 3 hr |
| Mar 6, 4:21 PM EST | Areal Flood Advisory | PBZ | 95 min |
| Mar 10, 10:48 AM EDT | Snow Squall Warning | PBZ | 42 min |
| Mar 10, 12:13 PM EDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 31, 1:03 PM EDT | Flood Watch | PBZ | 66 hr |
| Apr 2, 8:35 AM EDT | Flash Flood Warning | PBZ | 7 hr |
| Apr 2, 9:58 AM EDT | Areal Flood Warning | PBZ | 6 hr |
| Apr 2, 11:41 AM EDT | Areal Flood Warning | PBZ | 4 hr |
| Apr 2, 7:22 PM EDT | Tornado Watch | SPC | 4 hr |
| Apr 2, 8:42 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 2, 9:51 PM EDT | Flash Flood Warning | PBZ | 6 hr |
| Apr 3, 3:43 AM EDT | Areal Flood Warning | PBZ | 37 hr |
| Apr 3, 12:10 PM EDT | River Flood Warning | PBZ | 30 hr |
| Apr 3, 12:10 PM EDT | River Flood Warning | PBZ | 33 hr |
| Apr 11, 10:00 AM EDT | Flood Watch | PBZ | 16 hr |
| Apr 11, 4:06 PM EDT | Tornado Watch | SPC | 5 hr |
| Apr 11, 5:12 PM EDT | Flash Flood Warning | PBZ | 8 hr |
| Apr 11, 5:32 PM EDT | Flash Flood Warning | PBZ | 7 hr |
| Apr 11, 5:58 PM EDT | Flash Flood Warning | PBZ | 7 hr |
| Apr 11, 7:07 PM EDT | Flash Flood Warning | PBZ | 5 hr |
| Apr 11, 7:14 PM EDT | Flash Flood Warning | PBZ | 6 hr |
| Apr 12, 12:36 AM EDT | Areal Flood Warning | PBZ | 25 hr |
| Apr 12, 3:13 AM EDT | Wind Advisory | PBZ | 39 hr |
| Apr 14, 3:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 14, 4:58 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 14, 9:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 14, 10:57 PM EDT | Severe Thunderstorm Warning | PBZ | 34 min |
| Apr 14, 11:39 PM EDT | Special Weather Statement | PBZ | 36 min |
| Apr 15, 12:05 AM EDT | Severe Thunderstorm Warning | PBZ | 40 min |
| Apr 15, 12:37 AM EDT | Special Weather Statement | PBZ | 23 min |
| Apr 17, 2:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 17, 3:46 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 17, 6:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Apr 17, 6:53 PM EDT | Severe Thunderstorm Warning | PBZ | 67 min |
| Apr 17, 6:55 PM EDT | Severe Thunderstorm Warning | PBZ | 65 min |
| Apr 17, 8:00 PM EDT | Severe Thunderstorm Warning | PBZ | 22 min |
| Apr 20, 2:50 AM EDT | Freeze Watch | PBZ | 11 hr |
| Apr 20, 1:20 PM EDT | Frost Advisory | PBZ | 19 hr |
| Apr 21, 12:27 PM EDT | Frost Advisory | PBZ | 14 hr |
| Apr 21, 12:27 PM EDT | Freeze Warning | PBZ | 21 hr |
| Apr 22, 1:05 PM EDT | Frost Advisory | PBZ | 20 hr |
| Apr 23, 9:09 PM EDT | Special Weather Statement | PBZ | 66 min |
| May 5, 1:12 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 5, 6:49 PM EDT | Special Weather Statement | PBZ | 41 min |
| May 5, 7:33 PM EDT | Flash Flood Warning | PBZ | 2 hr |
| May 7, 9:17 PM EDT | Tornado Watch | SPC | 7 hr |
| May 8, 12:55 AM EDT | Tornado Warning | PBZ | 35 min |
| May 8, 1:26 AM EDT | Tornado Warning | PBZ | 34 min |
| May 8, 1:38 AM EDT | Severe Thunderstorm Warning | PBZ | 37 min |
| May 8, 1:48 AM EDT | Flash Flood Warning | PBZ | 3 hr |
| May 8, 2:26 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 11, 2:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 11, 4:55 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| May 11, 5:08 PM EDT | Severe Thunderstorm Warning | PBZ | 52 min |
| May 11, 6:07 PM EDT | Special Weather Statement | PBZ | 23 min |
| May 11, 6:09 PM EDT | Severe Thunderstorm Warning | PBZ | 51 min |
| May 11, 6:15 PM EDT | Tornado Warning | PBZ | 30 min |
| May 11, 6:58 PM EDT | Severe Thunderstorm Warning | PBZ | 62 min |
| May 18, 2:43 AM EDT | Areal Flood Advisory | PBZ | 2 hr |
| May 22, 12:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 11:39 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 25, 3:22 PM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| May 25, 3:59 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| May 25, 4:14 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| May 25, 4:51 PM EDT | Severe Thunderstorm Warning | PBZ | 39 min |
| May 25, 4:59 PM EDT | Tornado Warning | PBZ | 31 min |
| May 25, 5:08 PM EDT | Severe Thunderstorm Warning | PBZ | 52 min |
| May 25, 5:44 PM EDT | Severe Thunderstorm Warning | PBZ | 61 min |
| May 25, 6:22 PM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| May 25, 7:06 PM EDT | Severe Thunderstorm Warning | PBZ | 39 min |
| May 26, 12:00 AM EDT | Dense Fog Advisory | PBZ | 8 hr |
| May 26, 3:52 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 26, 6:12 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| May 26, 6:58 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| May 26, 7:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| May 26, 7:29 PM EDT | Severe Thunderstorm Warning | PBZ | 61 min |
| Jun 14, 12:17 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 14, 1:55 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 2:24 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 14, 4:42 PM EDT | Special Weather Statement | PBZ | 33 min |
| Jun 14, 5:21 PM EDT | Areal Flood Advisory | PBZ | 94 min |
| Jun 14, 6:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jun 14, 7:05 PM EDT | Special Weather Statement | PBZ | 40 min |
| Jun 15, 9:53 AM EDT | Excessive Heat Watch | PBZ | 40 hr |
| Jun 17, 2:06 AM EDT | Heat Advisory | PBZ | 6 days |
| Jun 17, 3:59 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Jun 17, 4:44 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Jun 17, 5:23 PM EDT | Severe Thunderstorm Warning | PBZ | 37 min |
| Jun 17, 7:04 PM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| Jun 17, 8:14 PM EDT | Special Weather Statement | PBZ | 31 min |
| Jun 18, 12:19 PM EDT | Excessive Heat Warning | PBZ | 4 days |
| Jun 18, 1:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jun 18, 4:13 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jun 18, 4:44 PM EDT | Severe Thunderstorm Warning | PBZ | 32 min |
| Jun 23, 1:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 23, 3:31 PM EDT | Tornado Warning | PBZ | 29 min |
| Jun 23, 4:11 PM EDT | Tornado Warning | PBZ | 34 min |
| Jun 23, 4:33 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 23, 4:38 PM EDT | Tornado Warning | PBZ | 37 min |
| Jun 23, 4:51 PM EDT | Severe Thunderstorm Warning | PBZ | 24 min |
| Jun 23, 6:40 PM EDT | Severe Thunderstorm Warning | PBZ | 35 min |
| Jun 23, 7:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 23, 8:20 PM EDT | Severe Thunderstorm Warning | PBZ | 40 min |
| Jun 26, 12:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 4:31 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 26, 4:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 26, 7:25 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Jun 28, 2:53 PM EDT | Flood Watch | PBZ | 28 hr |
| Jun 29, 12:03 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 29, 1:11 PM EDT | Tornado Watch | SPC | 7 hr |
| Jul 9, 3:19 AM EDT | Heat Advisory | PBZ | 16 hr |
| Jul 24, 5:02 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 31, 8:04 PM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| Jul 31, 8:39 PM EDT | Special Weather Statement | PBZ | 36 min |
| Jul 31, 8:56 PM EDT | Special Weather Statement | PBZ | 34 min |
| Aug 2, 7:12 AM EDT | Areal Flood Advisory | PBZ | 2 hr |
| Aug 4, 6:23 AM EDT | Dense Fog Advisory | PBZ | 3 hr |
| Aug 6, 11:42 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 6, 2:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 6, 4:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Aug 6, 7:06 PM EDT | Severe Thunderstorm Warning | PBZ | 39 min |
| Aug 6, 7:42 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Aug 17, 3:10 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Aug 17, 4:39 PM EDT | Severe Thunderstorm Warning | PBZ | 51 min |
| Aug 17, 5:10 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Aug 17, 5:11 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Aug 17, 5:30 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Aug 17, 6:12 PM EDT | Special Weather Statement | PBZ | 33 min |
| Aug 27, 10:48 PM EDT | Special Weather Statement | PBZ | 42 min |
| Aug 29, 2:59 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Aug 29, 3:26 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| Aug 29, 4:12 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Aug 29, 4:41 PM EDT | Special Weather Statement | PBZ | 34 min |
| Aug 29, 5:11 PM EDT | Flash Flood Warning | PBZ | 77 min |
| Aug 29, 5:11 PM EDT | Special Weather Statement | PBZ | 34 min |
| Aug 31, 12:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 31, 1:27 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 31, 1:50 PM EDT | Severe Thunderstorm Warning | PBZ | 25 min |
| Aug 31, 2:02 PM EDT | Severe Thunderstorm Warning | PBZ | 43 min |
| Aug 31, 7:30 PM EDT | Flash Flood Warning | PBZ | 85 min |
| Aug 31, 10:17 PM EDT | Areal Flood Advisory | PBZ | 118 min |
| Sep 21, 12:39 PM EDT | Special Weather Statement | PBZ | 36 min |
| Sep 21, 1:22 PM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| Sep 21, 2:37 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 6, 4:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Oct 6, 4:55 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Oct 10, 3:21 AM EDT | Frost Advisory | PBZ | 30 hr |
| Oct 10, 12:24 PM EDT | Freeze Warning | PBZ | 21 hr |
| Oct 17, 12:55 PM EDT | Frost Advisory | PBZ | 20 hr |
| Nov 20, 3:34 PM EST | Special Weather Statement | PBZ | 116 min |
| Nov 20, 4:24 PM EST | Severe Thunderstorm Warning | PBZ | 51 min |
| Nov 29, 1:51 PM EST | Special Weather Statement | PBZ | 24 min |
| Dec 5, 1:47 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 21, 10:56 AM EST | Winter Weather Advisory | PBZ | 13 hr |
| Dec 28, 1:10 PM EST | Wind Advisory | PBZ | 39 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 46 |
| Tornado Warning | 7 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 29 |
| Special Weather Statement | 26 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 11 |
| River Flood Warning | 2 |
| Flood Watch | 3 |
| Areal Flood Advisory | 7 |
| Winter | |
| Snow Squall Warning | 3 |
| Winter Weather Advisory | 4 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 5 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20232025
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.