Alert archive / Pennsylvania / Mercer County
Weather alerts in Mercer County, Pennsylvania, 2011
169 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Mercer County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 169
- Warnings
- 37
- Watches
- 31
- Advisories
- 26
- Busiest month
- May27 alerts
- Busiest day
- July 22, 20117 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 Mercer County in 2011 had a tornado report inside them.
Mercer County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 25 | 22 | 12% | 33 | 85% | 21 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 9 | 1 | 89% | 1 | 100% | 8 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 231 | 161 | 30% | 428 | 83% | 22 min |
| NWS Pittsburgh, PA: flash flood warnings | 21 | 11 | 48% | 23 | 91% | 81 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, 2:50 PM EST | Winter Weather Advisory | PBZ | 20 hr |
| Jan 7, 8:54 PM EST | Winter Weather Advisory | PBZ | 39 hr |
| Jan 9, 2:36 PM EST | Winter Storm Watch | PBZ | 25 hr |
| Jan 10, 3:19 PM EST | Winter Weather Advisory | PBZ | 3 days |
| Jan 17, 2:20 PM EST | Winter Weather Advisory | PBZ | 20 hr |
| Jan 19, 7:02 AM EST | Freezing Rain Advisory | PBZ | 3 hr |
| Jan 19, 2:40 PM EST | Winter Weather Advisory | PBZ | 37 hr |
| Jan 21, 3:23 AM EST | Winter Weather Advisory | PBZ | 15 hr |
| Jan 30, 3:30 PM EST | Winter Storm Watch | PBZ | 19 hr |
| Jan 31, 10:55 AM EST | Winter Storm Warning | PBZ | 41 hr |
| Feb 1, 12:12 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 1, 3:07 PM EST | Wind Advisory | PBZ | 24 hr |
| Feb 1, 8:39 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 4, 3:46 PM EST | Winter Weather Advisory | PBZ | 30 hr |
| Feb 8, 3:33 PM EST | Wind Chill Advisory | PBZ | 18 hr |
| Feb 9, 3:32 PM EST | Wind Chill Advisory | PBZ | 18 hr |
| Feb 10, 3:09 PM EST | Wind Chill Advisory | PBZ | 17 hr |
| Feb 13, 2:39 PM EST | Wind Advisory | PBZ | 28 hr |
| Feb 20, 4:00 AM EST | Winter Weather Advisory | PBZ | 17 hr |
| Feb 20, 7:46 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 20, 8:42 PM EST | Winter Storm Warning | PBZ | 14 hr |
| Feb 20, 11:50 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 21, 12:08 PM EST | Winter Weather Advisory | PBZ | 16 hr |
| Feb 24, 2:48 PM EST | Winter Weather Advisory | PBZ | 24 hr |
| Feb 24, 10:19 PM EST | Winter Storm Warning | PBZ | 17 hr |
| Feb 25, 2:46 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 27, 2:59 AM EST | Flood Watch | PBZ | 36 hr |
| Feb 28, 2:00 AM EST | Special Weather Statement | PBZ | 60 min |
| Feb 28, 3:18 AM EST | Special Weather Statement | PBZ | 57 min |
| Feb 28, 4:16 AM EST | Areal Flood Warning | PBZ | 20 hr |
| Feb 28, 5:23 AM EST | Special Weather Statement | PBZ | 22 min |
| Feb 28, 5:44 AM EST | Special Weather Statement | PBZ | 61 min |
| Mar 4, 3:47 AM EST | Flood Watch | PBZ | 54 hr |
| Mar 5, 3:24 PM EST | Winter Storm Watch | PBZ | 4 hr |
| Mar 5, 7:50 PM EST | Winter Weather Advisory | PBZ | 19 hr |
| Mar 8, 2:21 PM EST | Flood Watch | PBZ | 52 hr |
| Mar 9, 2:41 PM EST | Winter Storm Watch | PBZ | 25 hr |
| Mar 10, 3:00 PM EST | Areal Flood Warning | PBZ | 20 hr |
| Mar 10, 3:51 PM EST | Winter Storm Warning | PBZ | 26 hr |
| Apr 4, 9:19 AM EDT | Severe Thunderstorm Warning | PBZ | 26 min |
| Apr 4, 10:02 AM EDT | Special Weather Statement | PBZ | 58 min |
| Apr 16, 1:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Apr 16, 4:01 PM EDT | Wind Advisory | PBZ | 27 hr |
| Apr 20, 2:22 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Apr 20, 3:20 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Apr 20, 3:51 AM EDT | Special Weather Statement | PBZ | 39 min |
| Apr 20, 4:11 AM EDT | Severe Thunderstorm Warning | PBZ | 34 min |
| Apr 21, 2:55 PM EDT | Flash Flood Watch | PBZ | 53 hr |
| Apr 25, 1:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 25, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 25, 6:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Apr 27, 10:09 AM EDT | Flash Flood Watch | PBZ | 18 hr |
| Apr 27, 1:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 27, 3:10 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 27, 3:18 PM EDT | Special Weather Statement | PBZ | 57 min |
| Apr 27, 3:55 PM EDT | Severe Thunderstorm Warning | PBZ | 65 min |
| Apr 28, 5:22 AM EDT | Wind Advisory | PBZ | 6 hr |
| Apr 28, 6:57 AM EDT | High Wind Warning | PBZ | 5 hr |
| May 12, 11:04 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 12, 4:54 PM EDT | Special Weather Statement | PBZ | 51 min |
| May 12, 6:52 PM EDT | Mesoscale Discussion | SPC | |
| May 14, 4:10 AM EDT | Flash Flood Watch | PBZ | 20 hr |
| May 14, 9:35 PM EDT | Special Weather Statement | PBZ | 55 min |
| May 18, 2:34 PM EDT | Special Weather Statement | PBZ | 56 min |
| May 18, 3:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 23, 8:07 PM EDT | Mesoscale Discussion | SPC | 83 min |
| May 23, 8:15 PM EDT | Special Weather Statement | PBZ | 30 min |
| May 23, 8:31 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 23, 8:51 PM EDT | Severe Thunderstorm Warning | PBZ | 39 min |
| May 23, 9:07 PM EDT | Tornado Warning | PBZ | 38 min |
| May 25, 4:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 25, 8:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 8:24 PM EDT | Special Weather Statement | PBZ | 51 min |
| May 25, 8:42 PM EDT | Severe Thunderstorm Warning | PBZ | 63 min |
| May 25, 9:42 PM EDT | Severe Thunderstorm Warning | PBZ | 63 min |
| May 26, 12:25 AM EDT | Severe Thunderstorm Warning | PBZ | 35 min |
| May 26, 6:06 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 29, 6:05 PM EDT | Mesoscale Discussion | SPC | 25 min |
| May 29, 6:17 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 29, 7:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 29, 8:33 PM EDT | Special Weather Statement | PBZ | 57 min |
| May 29, 8:39 PM EDT | Severe Thunderstorm Warning | PBZ | 51 min |
| May 29, 9:09 PM EDT | Severe Thunderstorm Warning | PBZ | 51 min |
| May 29, 9:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| May 31, 4:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 7, 5:29 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 7, 6:47 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 7, 7:49 AM EDT | Severe Thunderstorm Warning | PBZ | 56 min |
| Jun 7, 8:22 AM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 7, 8:43 AM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jun 8, 1:51 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 9, 3:29 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 3:56 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 8:13 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 10:36 AM EDT | Mesoscale Discussion | SPC | 84 min |
| Jun 9, 12:53 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 10, 6:44 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 16, 4:13 PM EDT | Special Weather Statement | PBZ | 47 min |
| Jun 16, 5:13 PM EDT | Special Weather Statement | PBZ | 47 min |
| Jun 16, 5:19 PM EDT | Severe Thunderstorm Warning | PBZ | 56 min |
| Jun 16, 6:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 21, 8:55 PM EDT | Special Weather Statement | PBZ | 35 min |
| Jun 21, 11:13 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jun 23, 1:12 AM EDT | Special Weather Statement | PBZ | 33 min |
| Jun 23, 1:41 AM EDT | Special Weather Statement | PBZ | 64 min |
| Jun 23, 1:55 AM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jun 23, 12:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 23, 2:08 PM EDT | Special Weather Statement | PBZ | 67 min |
| Jun 23, 7:06 PM EDT | Special Weather Statement | PBZ | 39 min |
| Jun 23, 8:38 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jun 28, 1:19 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 2, 9:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 11, 3:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 18, 12:44 PM EDT | Severe Thunderstorm Warning | PBZ | 31 min |
| Jul 18, 1:15 PM EDT | Special Weather Statement | PBZ | 45 min |
| Jul 18, 1:18 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 18, 3:57 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 18, 8:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 20, 4:00 AM EDT | Excessive Heat Watch | PBZ | 8 hr |
| Jul 20, 11:32 AM EDT | Excessive Heat Warning | PBZ | 30 hr |
| Jul 22, 4:58 PM EDT | Special Weather Statement | PBZ | 47 min |
| Jul 22, 5:08 PM EDT | Severe Thunderstorm Warning | PBZ | 37 min |
| Jul 22, 5:17 PM EDT | Severe Thunderstorm Warning | PBZ | 43 min |
| Jul 22, 5:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jul 22, 5:37 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 22, 5:45 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jul 22, 6:08 PM EDT | Areal Flood Warning | PBZ | 2 hr |
| Jul 22, 8:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 23, 8:28 PM EDT | Special Weather Statement | PBZ | 47 min |
| Jul 25, 5:53 AM EDT | Special Weather Statement | PBZ | 67 min |
| Jul 25, 11:12 AM EDT | Mesoscale Discussion | SPC | 63 min |
| Jul 25, 11:37 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 28, 3:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 28, 4:03 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 28, 7:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Aug 1, 8:01 AM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 9, 6:56 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 9, 8:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 14, 12:18 AM EDT | Special Weather Statement | PBZ | 27 min |
| Aug 19, 1:00 PM EDT | Special Weather Statement | PBZ | 45 min |
| Aug 19, 1:27 PM EDT | Severe Thunderstorm Warning | PBZ | 63 min |
| Aug 19, 2:58 PM EDT | Severe Thunderstorm Warning | PBZ | 53 min |
| Aug 19, 3:24 PM EDT | Areal Flood Warning | PBZ | 3 hr |
| Aug 24, 11:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 25, 12:42 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 25, 1:30 AM EDT | Severe Thunderstorm Warning | PBZ | 60 min |
| Sep 1, 4:57 AM EDT | Special Weather Statement | PBZ | 63 min |
| Sep 1, 8:02 AM EDT | Areal Flood Warning | PBZ | 3 hr |
| Sep 9, 8:33 PM EDT | Flash Flood Watch | PBZ | 7 hr |
| Sep 13, 7:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Sep 13, 7:57 PM EDT | Severe Thunderstorm Warning | PBZ | 63 min |
| Sep 13, 8:31 PM EDT | Severe Thunderstorm Warning | PBZ | 59 min |
| Sep 13, 9:01 PM EDT | Special Weather Statement | PBZ | 29 min |
| Sep 23, 9:57 PM EDT | Dense Fog Advisory | PBZ | 11 hr |
| Sep 25, 6:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Sep 26, 2:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Oct 13, 8:24 PM EDT | Special Weather Statement | PBZ | 66 min |
| Oct 22, 4:12 AM EDT | Frost Advisory | PBZ | 29 hr |
| Oct 28, 6:48 AM EDT | Dense Fog Advisory | PBZ | 2 hr |
| Oct 29, 11:43 PM EDT | Dense Fog Advisory | PBZ | 11 hr |
| Nov 11, 1:58 AM EST | Special Weather Statement | PBZ | 2 hr |
| Nov 14, 3:29 PM EST | Tornado Watch | SPC | 6 hr |
| Nov 14, 4:38 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Nov 14, 6:40 PM EST | Special Weather Statement | PBZ | 50 min |
| Nov 14, 7:27 PM EST | Special Weather Statement | PBZ | 63 min |
| Nov 14, 7:33 PM EST | Severe Thunderstorm Warning | PBZ | 57 min |
| Nov 14, 7:44 PM EST | Severe Thunderstorm Warning | PBZ | 46 min |
| Nov 14, 8:04 PM EST | Severe Thunderstorm Warning | PBZ | 46 min |
| Dec 27, 4:21 AM EST | Winter Weather Advisory | PBZ | 24 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 | 25 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 17 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 43 |
| Special Weather Statement | 32 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flash Flood Watch | 4 |
| Flood Watch | 3 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 4 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 12 |
| Heat | |
| Excessive Heat Warning | 1 |
| Excessive Heat Watch | 1 |
| Cold | |
| Frost Advisory | 1 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.