Alert archive / Pennsylvania / Allegheny County
Weather alerts in Allegheny County, Pennsylvania, 2008
118 weather alerts in 2008, 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 2008. Tap one for its archive.
- Alerts
- 118
- Warnings
- 35
- Watches
- 18
- Advisories
- 41
- Busiest month
- June34 alerts
- Busiest day
- June 16, 20089 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Allegheny County in 2008 had a tornado report inside them.
Allegheny County, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 21 | 18 | 14% | 12 | 100% | 18 min |
| Flash flood warnings | 5 | 3 | 40% | 4 | 75% | 27 min |
Each office's whole area, 2008
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 8 | 2 | 75% | 5 | 40% | 11 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 179 | 102 | 43% | 169 | 83% | 23 min |
| NWS Pittsburgh, PA: flash flood warnings | 23 | 10 | 57% | 18 | 83% | 65 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 |
|---|---|---|---|
| Dec 31, 9:44 PM EST | Snow and Blowing Snow Advisory | PBZ | 29 hr |
| Jan 8, 2:47 PM EST | Wind Advisory | PBZ | 16 hr |
| Jan 29, 3:02 AM EST | Wind Advisory | PBZ | 12 hr |
| Jan 29, 2:47 PM EST | High Wind Warning | PBZ | 18 hr |
| Jan 31, 3:21 PM EST | Winter Weather Advisory | PBZ | 21 hr |
| Feb 1, 1:43 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 1, 11:36 AM EST | Areal Flood Advisory | PBZ | 4 hr |
| Feb 1, 9:53 PM EST | River Flood Advisory | PBZ | 13 hr |
| Feb 4, 9:51 PM EST | River Flood Advisory | PBZ | 55 hr |
| Feb 5, 3:24 AM EST | Flood Watch | PBZ | 37 hr |
| Feb 5, 12:33 PM EST | River Flood Watch | PBZ | 59 hr |
| Feb 5, 12:33 PM EST | River Flood Watch | PBZ | 68 hr |
| Feb 6, 6:09 PM EST | Mesoscale Discussion | SPC | 66 min |
| Feb 7, 4:41 AM EST | River Flood Warning | PBZ | 18 hr |
| Feb 7, 4:41 AM EST | River Flood Warning | PBZ | 10 hr |
| Feb 7, 10:39 PM EST | River Flood Advisory | PBZ | 30 hr |
| Feb 9, 3:59 AM EST | Wind Advisory | PBZ | 40 hr |
| Feb 9, 3:35 PM EST | Wind Chill Advisory | PBZ | 41 hr |
| Feb 11, 2:12 PM EST | Winter Storm Warning | PBZ | 37 hr |
| Feb 11, 2:12 PM EST | Winter Weather Advisory | PBZ | 29 hr |
| Feb 12, 1:06 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 12, 7:41 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 21, 3:15 AM EST | Winter Weather Advisory | PBZ | 40 hr |
| Feb 25, 2:37 PM EST | Winter Weather Advisory | PBZ | 37 hr |
| Feb 29, 6:29 PM EST | Heavy Snow Warning | PBZ | 4 hr |
| Mar 3, 3:34 AM EST | Flood Watch | PBZ | 45 hr |
| Mar 3, 11:08 AM EST | River Flood Watch | PBZ | 43 hr |
| Mar 3, 11:08 AM EST | River Flood Watch | PBZ | 25 hr |
| Mar 3, 10:25 PM EST | River Flood Watch | PBZ | 14 hr |
| Mar 4, 11:48 AM EST | Areal Flood Advisory | PBZ | 3 hr |
| Mar 4, 8:24 PM EST | Areal Flood Warning | PBZ | 6 hr |
| Mar 5, 9:36 PM EST | River Flood Advisory | PBZ | 30 hr |
| Mar 7, 3:36 AM EST | Winter Weather Advisory | PBZ | 50 hr |
| Mar 7, 11:22 AM EST | River Flood Advisory | PBZ | 47 hr |
| Mar 8, 6:16 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Mar 18, 3:54 AM EDT | Flood Watch | PBZ | 42 hr |
| Mar 18, 2:31 PM EDT | River Flood Advisory | PBZ | 4 days |
| Mar 18, 10:11 PM EDT | River Flood Watch | PBZ | 14 hr |
| Mar 19, 11:42 AM EDT | River Flood Watch | PBZ | 11 hr |
| Apr 29, 3:05 AM EDT | Frost Advisory | PBZ | 24 hr |
| May 28, 5:21 PM EDT | Frost Advisory | PBZ | 13 hr |
| May 31, 4:10 AM EDT | Tornado Watch | SPC | 6 hr |
| May 31, 7:27 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 1:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 13, 8:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 13, 9:07 PM EDT | Severe Thunderstorm Warning | PBZ | 53 min |
| Jun 15, 3:11 AM EDT | Dense Fog Advisory | PBZ | 6 hr |
| Jun 15, 9:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 16, 11:28 AM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 16, 2:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 16, 3:27 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Jun 16, 3:56 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| Jun 16, 4:22 PM EDT | Severe Thunderstorm Warning | PBZ | 23 min |
| Jun 16, 4:37 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jun 16, 5:08 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jun 16, 7:04 PM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| Jun 22, 2:24 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 23, 2:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 26, 7:31 PM EDT | Severe Thunderstorm Warning | PBZ | 59 min |
| Jun 26, 8:22 PM EDT | Severe Thunderstorm Warning | PBZ | 53 min |
| Jun 28, 10:39 AM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 28, 12:59 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 3:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 28, 5:52 PM EDT | Severe Thunderstorm Warning | PBZ | 53 min |
| Jun 28, 6:11 PM EDT | Severe Thunderstorm Warning | PBZ | 64 min |
| Jun 28, 6:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 28, 6:50 PM EDT | Severe Thunderstorm Warning | PBZ | 23 min |
| Jun 29, 10:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 29, 12:11 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 29, 4:14 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jun 29, 4:57 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Jun 29, 5:16 PM EDT | Tornado Warning | PBZ | 29 min |
| Jun 29, 5:37 PM EDT | Severe Thunderstorm Warning | PBZ | 53 min |
| Jun 29, 7:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 29, 7:23 PM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| Jun 29, 7:55 PM EDT | Severe Thunderstorm Warning | PBZ | 65 min |
| Jun 29, 8:15 PM EDT | Areal Flood Advisory | PBZ | 77 min |
| Jul 6, 4:36 PM EDT | Flash Flood Warning | PBZ | 49 min |
| Jul 8, 5:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 8, 6:04 PM EDT | Severe Thunderstorm Watch | SPC | 2 hr |
| Jul 8, 6:38 PM EDT | Severe Thunderstorm Warning | PBZ | 67 min |
| Jul 8, 8:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jul 20, 11:29 AM EDT | Mesoscale Discussion | SPC | 61 min |
| Jul 20, 12:35 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 20, 1:13 PM EDT | Severe Thunderstorm Warning | PBZ | 62 min |
| Jul 20, 1:56 PM EDT | Severe Thunderstorm Warning | PBZ | 64 min |
| Jul 20, 2:18 PM EDT | Severe Thunderstorm Warning | PBZ | 57 min |
| Jul 21, 10:28 AM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 21, 6:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 21, 8:12 PM EDT | Severe Thunderstorm Warning | PBZ | 63 min |
| Jul 21, 8:33 PM EDT | Severe Thunderstorm Warning | PBZ | 57 min |
| Jul 23, 1:13 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Aug 5, 7:32 AM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Aug 5, 7:53 AM EDT | Flash Flood Warning | PBZ | 3 hr |
| Aug 14, 3:52 PM EDT | Severe Thunderstorm Warning | PBZ | 53 min |
| Aug 14, 4:27 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Sep 14, 3:46 PM EDT | Wind Advisory | PBZ | 11 hr |
| Sep 14, 8:02 PM EDT | High Wind Warning | PBZ | 4 hr |
| Oct 18, 3:06 AM EDT | Frost Advisory | PBZ | 12 hr |
| Oct 18, 3:06 AM EDT | Freeze Warning | PBZ | 30 hr |
| Nov 20, 2:54 AM EST | Winter Weather Advisory | PBZ | 39 hr |
| Nov 25, 3:01 AM EST | Winter Weather Advisory | PBZ | 24 hr |
| Dec 10, 3:23 PM EST | Winter Weather Advisory | PBZ | 36 hr |
| Dec 11, 12:04 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Dec 11, 1:52 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Dec 12, 8:09 AM EST | River Flood Advisory | PBZ | 26 hr |
| Dec 15, 3:40 AM EST | Winter Storm Watch | PBZ | 24 hr |
| Dec 16, 3:57 AM EST | Winter Weather Advisory | PBZ | 26 hr |
| Dec 18, 11:39 AM EST | River Flood Advisory | PBZ | 9 hr |
| Dec 18, 2:43 PM EST | Winter Weather Advisory | PBZ | 20 hr |
| Dec 19, 9:15 PM EST | River Flood Advisory | PBZ | 35 hr |
| Dec 20, 3:11 PM EST | Winter Weather Advisory | PBZ | 18 hr |
| Dec 21, 2:32 PM EST | Wind Chill Advisory | PBZ | 21 hr |
| Dec 23, 4:21 AM EST | Winter Weather Advisory | PBZ | 32 hr |
| Dec 23, 8:55 PM EST | River Flood Advisory | PBZ | 61 hr |
| Dec 24, 6:40 PM EST | Areal Flood Advisory | PBZ | 4 hr |
| Dec 27, 8:16 AM EST | River Flood Advisory | PBZ | 13 hr |
| Dec 27, 8:07 PM EST | Wind Advisory | PBZ | 19 hr |
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 archive20072009
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.