Alert archive / Pennsylvania / Allegheny County
Weather alerts in Allegheny County, Pennsylvania, 2018
229 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Allegheny County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 229
- Warnings
- 87
- Watches
- 37
- Advisories
- 44
- Busiest month
- May30 alerts
- Busiest day
- October 2, 20188 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Allegheny County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 33 | 25 | 24% | 34 | 74% | 26 min |
| Flash flood warnings | 20 | 17 | 15% | 84 | 87% | 56 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 21 | 4 | 81% | 14 | 43% | 12 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 207 | 154 | 26% | 416 | 80% | 19 min |
| NWS Pittsburgh, PA: flash flood warnings | 79 | 54 | 32% | 204 | 84% | 62 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 3, 3:42 PM EST | Wind Chill Advisory | PBZ | 4 days |
| Jan 6, 1:18 PM EST | Wind Chill Advisory | PBZ | 21 hr |
| Jan 7, 2:08 PM EST | Winter Weather Advisory | PBZ | 36 hr |
| Jan 11, 3:07 AM EST | Winter Storm Watch | PBZ | 12 hr |
| Jan 11, 12:45 PM EST | Flood Watch | PBZ | 32 hr |
| Jan 11, 3:06 PM EST | Winter Storm Warning | PBZ | 43 hr |
| Jan 12, 1:03 AM EST | Areal Flood Advisory | PBZ | 8 hr |
| Jan 12, 1:20 AM EST | Areal Flood Warning | PBZ | 13 hr |
| Jan 12, 12:16 PM EST | River Flood Advisory | PBZ | 70 hr |
| Jan 12, 2:30 PM EST | Areal Flood Warning | PBZ | 3 hr |
| Jan 12, 5:21 PM EST | Areal Flood Warning | PBZ | 18 hr |
| Jan 12, 7:04 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 13, 2:42 AM EST | River Flood Warning | PBZ | 14 hr |
| Jan 13, 7:15 AM EST | River Flood Warning | PBZ | 27 hr |
| Jan 13, 11:19 AM EST | Areal Flood Advisory | PBZ | 9 hr |
| Jan 14, 10:32 AM EST | River Flood Advisory | PBZ | 36 hr |
| Jan 23, 2:16 AM EST | Special Weather Statement | PBZ | 44 min |
| Jan 30, 5:21 AM EST | Special Weather Statement | PBZ | 54 min |
| Jan 30, 6:15 AM EST | Special Weather Statement | PBZ | 45 min |
| Jan 30, 7:05 AM EST | Special Weather Statement | PBZ | 55 min |
| Jan 30, 8:22 AM EST | Special Weather Statement | PBZ | 53 min |
| Jan 30, 9:27 AM EST | Special Weather Statement | PBZ | 63 min |
| Jan 30, 10:40 AM EST | Special Weather Statement | PBZ | 65 min |
| Jan 30, 11:57 AM EST | Special Weather Statement | PBZ | 63 min |
| Feb 2, 12:01 PM EST | Special Weather Statement | PBZ | 74 min |
| Feb 4, 10:16 PM EST | Special Weather Statement | PBZ | 119 min |
| Feb 6, 2:56 AM EST | Winter Weather Advisory | PBZ | 34 hr |
| Feb 6, 3:25 PM EST | Winter Storm Warning | PBZ | 24 hr |
| Feb 7, 5:28 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 12, 2:16 AM EST | Special Weather Statement | PBZ | 59 min |
| Feb 12, 3:15 AM EST | Special Weather Statement | PBZ | 75 min |
| Feb 12, 4:28 AM EST | Special Weather Statement | PBZ | 77 min |
| Feb 14, 11:45 AM EST | River Flood Watch | PBZ | 45 hr |
| Feb 14, 11:45 AM EST | River Flood Watch | PBZ | 45 hr |
| Feb 14, 11:45 AM EST | River Flood Watch | PBZ | 41 hr |
| Feb 14, 3:23 PM EST | Flood Watch | PBZ | 51 hr |
| Feb 15, 11:46 AM EST | River Flood Watch | PBZ | 21 hr |
| Feb 15, 5:33 PM EST | Areal Flood Warning | PBZ | 39 hr |
| Feb 15, 7:19 PM EST | Areal Flood Warning | PBZ | 15 hr |
| Feb 15, 9:33 PM EST | River Flood Warning | PBZ | 53 hr |
| Feb 16, 7:51 AM EST | River Flood Warning | PBZ | 46 hr |
| Feb 16, 7:51 AM EST | River Flood Warning | PBZ | 35 hr |
| Feb 16, 7:51 AM EST | River Flood Warning | PBZ | 26 hr |
| Feb 16, 10:12 AM EST | Areal Flood Warning | PBZ | 22 hr |
| Feb 16, 10:50 AM EST | River Flood Warning | PBZ | 36 hr |
| Feb 18, 3:21 AM EST | River Flood Advisory | PBZ | 12 days |
| Feb 22, 3:15 AM EST | Flood Watch | PBZ | 3 days |
| Feb 22, 7:29 AM EST | Areal Flood Warning | PBZ | 9 hr |
| Feb 22, 11:50 AM EST | River Flood Watch | PBZ | 71 hr |
| Feb 22, 11:50 AM EST | River Flood Watch | PBZ | 47 hr |
| Feb 22, 11:50 AM EST | River Flood Watch | PBZ | 71 hr |
| Feb 22, 11:50 AM EST | River Flood Watch | PBZ | 47 hr |
| Feb 25, 1:08 AM EST | Areal Flood Advisory | PBZ | 3 hr |
| Mar 1, 10:10 AM EST | High Wind Watch | PBZ | 5 hr |
| Mar 1, 10:10 AM EST | High Wind Warning | PBZ | 28 hr |
| Mar 2, 3:25 PM EST | River Flood Advisory | PBZ | 43 hr |
| Mar 7, 6:45 AM EST | Special Weather Statement | PBZ | 2 hr |
| Mar 8, 6:35 PM EST | Special Weather Statement | PBZ | 55 min |
| Mar 13, 11:26 AM EDT | Special Weather Statement | PBZ | 64 min |
| Mar 13, 12:54 PM EDT | Special Weather Statement | PBZ | 66 min |
| Mar 16, 4:21 AM EDT | Special Weather Statement | PBZ | 54 min |
| Mar 16, 5:42 AM EDT | Special Weather Statement | PBZ | 33 min |
| Mar 19, 3:19 PM EDT | Winter Weather Advisory | PBZ | 53 hr |
| Mar 20, 12:06 PM EDT | Winter Weather Advisory | PBZ | 32 hr |
| Mar 28, 11:36 PM EDT | Dense Fog Advisory | PBZ | 7 hr |
| Mar 29, 11:25 AM EDT | River Flood Advisory | PBZ | 68 hr |
| Mar 31, 1:58 PM EDT | River Flood Advisory | PBZ | 36 hr |
| Apr 1, 1:32 PM EDT | Winter Weather Advisory | PBZ | 17 hr |
| Apr 2, 8:40 PM EDT | River Flood Advisory | PBZ | 4 days |
| Apr 3, 7:10 AM EDT | Flash Flood Watch | PBZ | 19 hr |
| Apr 3, 1:58 PM EDT | Wind Advisory | PBZ | 30 hr |
| Apr 3, 6:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 3, 7:57 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Apr 3, 8:09 PM EDT | Severe Thunderstorm Warning | PBZ | 26 min |
| Apr 3, 8:20 PM EDT | Areal Flood Advisory | PBZ | 11 hr |
| Apr 3, 8:29 PM EDT | Special Weather Statement | PBZ | 46 min |
| Apr 3, 8:33 PM EDT | Severe Thunderstorm Warning | PBZ | 27 min |
| Apr 12, 7:49 PM EDT | Fire Weather Watch | PBZ | 14 hr |
| Apr 13, 9:30 AM EDT | Red Flag Warning | PBZ | 11 hr |
| Apr 13, 10:53 AM EDT | River Flood Watch | PBZ | 24 hr |
| Apr 13, 10:53 AM EDT | River Flood Watch | PBZ | 47 hr |
| Apr 13, 10:53 AM EDT | River Flood Watch | PBZ | 47 hr |
| Apr 14, 2:41 PM EDT | Flash Flood Watch | PBZ | 37 hr |
| Apr 15, 9:36 PM EDT | River Flood Advisory | PBZ | 5 days |
| Apr 15, 10:10 PM EDT | Areal Flood Warning | PBZ | 18 hr |
| Apr 16, 10:52 AM EDT | River Flood Warning | PBZ | 35 hr |
| May 3, 3:13 PM EDT | Special Weather Statement | PBZ | 32 min |
| May 4, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 4, 4:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| May 4, 5:21 PM EDT | Severe Thunderstorm Warning | PBZ | 24 min |
| May 4, 5:51 PM EDT | Severe Thunderstorm Warning | PBZ | 54 min |
| May 10, 4:37 AM EDT | Special Weather Statement | PBZ | 23 min |
| May 10, 1:45 PM EDT | Special Weather Statement | PBZ | 45 min |
| May 12, 1:51 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 12, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 12, 3:07 PM EDT | Special Weather Statement | PBZ | 38 min |
| May 12, 3:29 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| May 12, 3:54 PM EDT | Severe Thunderstorm Warning | PBZ | 51 min |
| May 12, 5:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 12, 5:30 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| May 13, 8:04 AM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| May 14, 11:56 AM EDT | Mesoscale Discussion | SPC | 64 min |
| May 14, 12:29 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 15, 2:42 AM EDT | Flash Flood Watch | PBZ | 20 hr |
| May 15, 12:26 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 16, 7:01 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| May 16, 7:14 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| May 16, 8:23 PM EDT | Areal Flood Advisory | PBZ | 112 min |
| May 19, 4:50 PM EDT | Special Weather Statement | PBZ | 25 min |
| May 19, 5:12 PM EDT | Special Weather Statement | PBZ | 33 min |
| May 19, 5:35 PM EDT | Severe Thunderstorm Warning | PBZ | 40 min |
| May 22, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 22, 3:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| May 22, 6:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| May 22, 6:46 PM EDT | Severe Thunderstorm Warning | PBZ | 44 min |
| May 22, 7:26 PM EDT | Severe Thunderstorm Warning | PBZ | 36 min |
| May 31, 9:04 PM EDT | Special Weather Statement | PBZ | 26 min |
| Jun 3, 7:04 PM EDT | Special Weather Statement | PBZ | 41 min |
| Jun 5, 2:50 PM EDT | Severe Thunderstorm Warning | PBZ | 25 min |
| Jun 5, 3:03 PM EDT | Severe Thunderstorm Warning | PBZ | 27 min |
| Jun 5, 3:05 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 5:36 PM EDT | Special Weather Statement | PBZ | 24 min |
| Jun 8, 7:56 PM EDT | Areal Flood Warning | PBZ | 2 hr |
| Jun 9, 2:36 PM EDT | Flash Flood Watch | PBZ | 9 hr |
| Jun 10, 6:00 PM EDT | Flash Flood Warning | PBZ | 5 hr |
| Jun 10, 6:41 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jun 13, 6:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 13, 6:33 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 13, 6:48 PM EDT | Severe Thunderstorm Warning | PBZ | 42 min |
| Jun 13, 7:00 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Jun 13, 7:45 PM EDT | Areal Flood Warning | PBZ | 105 min |
| Jun 13, 8:20 PM EDT | Flash Flood Warning | PBZ | 79 min |
| Jun 13, 8:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 20, 10:53 AM EDT | Flash Flood Watch | PBZ | 11 hr |
| Jun 20, 4:17 PM EDT | Flash Flood Warning | PBZ | 88 min |
| Jun 20, 7:52 PM EDT | Flash Flood Warning | PBZ | 6 hr |
| Jun 20, 9:07 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jul 2, 5:41 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| Jul 2, 6:33 PM EDT | Severe Thunderstorm Warning | PBZ | 19 min |
| Jul 2, 6:47 PM EDT | Flash Flood Warning | PBZ | 118 min |
| Jul 2, 6:51 PM EDT | Flash Flood Warning | PBZ | 114 min |
| Jul 2, 7:08 PM EDT | Special Weather Statement | PBZ | 37 min |
| Jul 2, 7:10 PM EDT | Special Weather Statement | PBZ | 35 min |
| Jul 3, 2:09 PM EDT | Heat Advisory | PBZ | 29 hr |
| Jul 4, 7:42 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Jul 4, 7:49 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jul 4, 8:31 PM EDT | Special Weather Statement | PBZ | 44 min |
| Jul 4, 8:37 PM EDT | Flash Flood Warning | PBZ | 113 min |
| Jul 4, 10:43 PM EDT | Areal Flood Advisory | PBZ | 4 hr |
| Jul 5, 4:10 AM EDT | Flash Flood Watch | PBZ | 19 hr |
| Jul 5, 5:40 AM EDT | Areal Flood Advisory | PBZ | 94 min |
| Jul 5, 7:07 AM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jul 15, 5:02 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jul 15, 5:13 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jul 15, 5:23 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jul 15, 6:17 PM EDT | Severe Thunderstorm Warning | PBZ | 43 min |
| Jul 15, 6:53 PM EDT | Areal Flood Advisory | PBZ | 108 min |
| Jul 25, 1:28 AM EDT | Areal Flood Advisory | PBZ | 63 min |
| Aug 4, 6:55 AM EDT | Dense Fog Advisory | PBZ | 2 hr |
| Aug 5, 12:49 PM EDT | Severe Thunderstorm Warning | PBZ | 12 min |
| Aug 5, 2:18 PM EDT | Flash Flood Warning | PBZ | 117 min |
| Aug 5, 2:45 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Aug 5, 3:13 PM EDT | Flash Flood Warning | PBZ | 99 min |
| Aug 5, 3:32 PM EDT | Areal Flood Advisory | PBZ | 118 min |
| Aug 5, 4:03 PM EDT | Severe Thunderstorm Warning | PBZ | 27 min |
| Aug 5, 4:33 PM EDT | Flash Flood Warning | PBZ | 88 min |
| Aug 10, 2:04 PM EDT | Flash Flood Warning | PBZ | 5 hr |
| Aug 10, 3:20 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Aug 10, 4:55 PM EDT | Flash Flood Warning | PBZ | 77 min |
| Aug 13, 12:51 PM EDT | Special Weather Statement | PBZ | 24 min |
| Aug 13, 1:08 PM EDT | Severe Thunderstorm Warning | PBZ | 22 min |
| Aug 13, 1:13 PM EDT | Flash Flood Warning | PBZ | 2 hr |
| Aug 13, 1:30 PM EDT | Severe Thunderstorm Warning | PBZ | 30 min |
| Aug 13, 1:40 PM EDT | Severe Thunderstorm Warning | PBZ | 13 min |
| Aug 13, 1:48 PM EDT | Severe Thunderstorm Warning | PBZ | 27 min |
| Aug 13, 1:57 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 16, 2:53 PM EDT | Special Weather Statement | PBZ | 37 min |
| Aug 16, 3:20 PM EDT | Special Weather Statement | PBZ | 25 min |
| Aug 16, 3:39 PM EDT | Special Weather Statement | PBZ | 36 min |
| Aug 21, 2:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 29, 6:52 PM EDT | Severe Thunderstorm Warning | PBZ | 53 min |
| Sep 6, 12:04 PM EDT | Special Weather Statement | PBZ | 26 min |
| Sep 8, 3:34 AM EDT | Flood Watch | PBZ | 49 hr |
| Sep 8, 5:37 AM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Sep 8, 11:25 AM EDT | River Flood Watch | PBZ | 36 hr |
| Sep 8, 11:25 AM EDT | River Flood Watch | PBZ | 36 hr |
| Sep 8, 11:25 AM EDT | River Flood Watch | PBZ | 36 hr |
| Sep 8, 11:25 AM EDT | River Flood Watch | PBZ | 36 hr |
| Sep 8, 11:25 AM EDT | River Flood Watch | PBZ | 36 hr |
| Sep 9, 10:40 AM EDT | Areal Flood Warning | PBZ | 5 hr |
| Sep 9, 11:58 AM EDT | Areal Flood Warning | PBZ | 3 hr |
| Sep 9, 3:00 PM EDT | Areal Flood Warning | PBZ | 18 hr |
| Sep 9, 5:12 PM EDT | River Flood Warning | PBZ | 46 hr |
| Sep 9, 5:12 PM EDT | River Flood Warning | PBZ | 50 hr |
| Sep 9, 5:12 PM EDT | River Flood Warning | PBZ | 46 hr |
| Sep 9, 5:12 PM EDT | River Flood Warning | PBZ | 44 hr |
| Sep 9, 10:55 PM EDT | River Flood Warning | PBZ | 39 hr |
| Sep 10, 11:02 AM EDT | Areal Flood Warning | PBZ | 6 hr |
| Sep 10, 3:43 PM EDT | River Flood Warning | PBZ | 25 hr |
| Sep 10, 4:57 PM EDT | Areal Flood Warning | PBZ | 18 hr |
| Sep 11, 11:17 AM EDT | River Flood Advisory | PBZ | 28 hr |
| Sep 21, 4:32 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 21, 7:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Sep 21, 7:09 PM EDT | Severe Thunderstorm Warning | PBZ | 51 min |
| Sep 21, 7:44 PM EDT | Special Weather Statement | PBZ | 31 min |
| Sep 21, 7:58 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Sep 21, 9:07 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Sep 25, 11:06 AM EDT | River Flood Advisory | PBZ | 3 days |
| Sep 27, 10:27 PM EDT | River Flood Advisory | PBZ | 44 hr |
| Oct 2, 2:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 2, 2:45 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Oct 2, 2:55 PM EDT | Tornado Watch | SPC | 8 hr |
| Oct 2, 3:28 PM EDT | Special Weather Statement | PBZ | 32 min |
| Oct 2, 4:25 PM EDT | Special Weather Statement | PBZ | 35 min |
| Oct 2, 4:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 2, 4:47 PM EDT | Severe Thunderstorm Warning | PBZ | 43 min |
| Oct 2, 7:24 PM EDT | Mesoscale Discussion | SPC | 81 min |
| Oct 2, 9:25 PM EDT | Areal Flood Advisory | PBZ | 2 hr |
| Oct 4, 4:34 PM EDT | Special Weather Statement | PBZ | 56 min |
| Oct 4, 5:11 PM EDT | Flash Flood Warning | PBZ | 94 min |
| Oct 4, 6:42 PM EDT | Areal Flood Warning | PBZ | 2 hr |
| Oct 17, 2:12 PM EDT | Frost Advisory | PBZ | 19 hr |
| Oct 18, 2:16 PM EDT | Frost Advisory | PBZ | 19 hr |
| Nov 1, 11:38 AM EDT | River Flood Advisory | PBZ | 10 hr |
| Nov 14, 2:47 PM EST | Winter Weather Advisory | PBZ | 34 hr |
| Nov 15, 3:18 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 29, 6:17 PM EST | Winter Weather Advisory | PBZ | 8 hr |
| Dec 1, 11:31 PM EST | Special Weather Statement | PBZ | 29 min |
| Dec 20, 11:05 AM EST | River Flood Advisory | PBZ | 3 days |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.