Alert archive / Pennsylvania / Mercer County
Weather alerts in Mercer County, Pennsylvania, 2017
121 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 121
- Warnings
- 30
- Watches
- 12
- Advisories
- 27
- Busiest month
- June19 alerts
- Busiest day
- March 1, 20177 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 2017 had a tornado report inside them.
Mercer County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 20 | 15 | 25% | 14 | 86% | 23 min |
| Flash flood warnings | 2 | 2 | 0% | 4 | 100% | 113 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 14 | 8 | 43% | 18 | 67% | 11 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 225 | 186 | 17% | 518 | 88% | 21 min |
| NWS Pittsburgh, PA: flash flood warnings | 76 | 64 | 16% | 268 | 96% | 112 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 1, 9:41 PM EST | Freezing Rain Advisory | PBZ | 8 hr |
| Jan 9, 11:47 AM EST | Winter Weather Advisory | PBZ | 35 hr |
| Jan 10, 4:24 AM EST | Special Weather Statement | PBZ | 36 min |
| Jan 10, 4:45 PM EST | Wind Advisory | PBZ | 9 hr |
| Jan 12, 6:39 AM EST | Flash Flood Watch | PBZ | 10 hr |
| Jan 12, 7:33 AM EST | Flash Flood Warning | PBZ | 3 hr |
| Jan 12, 10:37 AM EST | Areal Flood Warning | PBZ | 6 hr |
| Jan 12, 1:56 PM EST | Severe Thunderstorm Warning | PBZ | 34 min |
| Jan 12, 2:15 PM EST | Severe Thunderstorm Warning | PBZ | 45 min |
| Jan 21, 12:44 AM EST | Dense Fog Advisory | PBZ | 7 hr |
| Jan 29, 11:38 AM EST | Special Weather Statement | PBZ | 82 min |
| Jan 30, 12:00 PM EST | Special Weather Statement | PBZ | 2 hr |
| Jan 30, 1:46 PM EST | Winter Weather Advisory | PBZ | 21 hr |
| Feb 1, 8:53 AM EST | Special Weather Statement | PBZ | 112 min |
| Feb 1, 11:24 AM EST | Special Weather Statement | PBZ | 66 min |
| Feb 8, 9:40 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 12, 3:40 AM EST | Wind Advisory | PBZ | 31 hr |
| Feb 12, 3:40 AM EST | Winter Weather Advisory | PBZ | 28 hr |
| Feb 12, 9:10 PM EST | Special Weather Statement | PBZ | 20 min |
| Feb 24, 8:49 PM EST | Mesoscale Discussion | SPC | 116 min |
| Mar 1, 2:19 AM EST | Mesoscale Discussion | SPC | 86 min |
| Mar 1, 3:01 AM EST | Special Weather Statement | PBZ | 44 min |
| Mar 1, 4:25 AM EST | Special Weather Statement | PBZ | 50 min |
| Mar 1, 12:44 PM EST | Wind Advisory | PBZ | 17 hr |
| Mar 1, 3:56 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 1, 4:26 PM EST | Special Weather Statement | PBZ | 64 min |
| Mar 1, 5:26 PM EST | Special Weather Statement | PBZ | 49 min |
| Mar 3, 3:25 AM EST | Winter Weather Advisory | PBZ | 5 hr |
| Mar 3, 10:09 AM EST | Special Weather Statement | PBZ | 66 min |
| Mar 7, 11:52 AM EST | Wind Advisory | PBZ | 39 hr |
| Mar 9, 3:43 AM EST | Winter Weather Advisory | PBZ | 33 hr |
| Mar 10, 11:39 AM EST | Special Weather Statement | PBZ | 51 min |
| Mar 12, 3:31 PM EDT | Winter Storm Warning | PBZ | 44 hr |
| Mar 14, 11:37 AM EDT | Winter Weather Advisory | PBZ | 47 hr |
| Mar 17, 8:23 PM EDT | Winter Weather Advisory | PBZ | 13 hr |
| Apr 16, 2:15 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 16, 3:06 PM EDT | Special Weather Statement | PBZ | 39 min |
| Apr 16, 3:49 PM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| Apr 20, 2:40 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Apr 30, 2:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 1, 11:59 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 1, 12:32 PM EDT | Tornado Watch | SPC | 4 hr |
| May 1, 1:35 PM EDT | Severe Thunderstorm Warning | PBZ | 55 min |
| May 1, 1:47 PM EDT | Severe Thunderstorm Warning | PBZ | 43 min |
| May 1, 2:05 PM EDT | Severe Thunderstorm Warning | PBZ | 55 min |
| May 1, 2:26 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| May 2, 4:37 AM EDT | Wind Advisory | PBZ | 14 hr |
| May 7, 1:59 PM EDT | Freeze Warning | PBZ | 19 hr |
| May 8, 2:47 PM EDT | Freeze Warning | PBZ | 18 hr |
| May 28, 3:54 PM EDT | Severe Thunderstorm Warning | PBZ | 36 min |
| May 28, 4:09 PM EDT | Mesoscale Discussion | SPC | 66 min |
| May 28, 5:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| May 28, 7:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| May 28, 8:01 PM EDT | Special Weather Statement | PBZ | 29 min |
| May 28, 9:12 PM EDT | Areal Flood Warning | PBZ | 3 hr |
| May 31, 2:05 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jun 4, 6:04 PM EDT | Special Weather Statement | PBZ | 26 min |
| Jun 14, 2:20 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 6:53 PM EDT | Special Weather Statement | PBZ | 37 min |
| Jun 18, 12:31 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 18, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 18, 2:41 PM EDT | Severe Thunderstorm Warning | PBZ | 34 min |
| Jun 18, 3:14 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Jun 18, 4:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 18, 6:55 PM EDT | Severe Thunderstorm Warning | PBZ | 35 min |
| Jun 18, 11:27 PM EDT | Areal Flood Warning | PBZ | 9 hr |
| Jun 19, 9:15 AM EDT | Areal Flood Warning | PBZ | 6 hr |
| Jun 19, 7:25 PM EDT | Special Weather Statement | PBZ | 35 min |
| Jun 22, 1:18 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 2:59 PM EDT | Special Weather Statement | PBZ | 31 min |
| Jun 29, 9:16 PM EDT | Severe Thunderstorm Warning | PBZ | 44 min |
| Jun 29, 9:19 PM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| Jun 29, 9:56 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| Jun 29, 10:01 PM EDT | Severe Thunderstorm Warning | PBZ | 44 min |
| Jun 30, 5:33 PM EDT | Flash Flood Watch | PBZ | 10 hr |
| Jun 30, 8:00 PM EDT | Special Weather Statement | PBZ | 45 min |
| Jun 30, 9:13 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jun 30, 10:37 PM EDT | Flash Flood Warning | PBZ | 5 hr |
| Jul 7, 8:02 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 7:42 AM EDT | Special Weather Statement | PBZ | 33 min |
| Jul 10, 2:34 PM EDT | Special Weather Statement | PBZ | 56 min |
| Jul 13, 6:14 AM EDT | Special Weather Statement | PBZ | 31 min |
| Jul 13, 8:39 AM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jul 13, 9:25 AM EDT | Flash Flood Watch | PBZ | 31 hr |
| Jul 20, 11:36 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 23, 11:38 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Aug 4, 11:38 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 12:20 PM EDT | Special Weather Statement | PBZ | 25 min |
| Aug 4, 1:25 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 4, 2:20 PM EDT | Special Weather Statement | PBZ | 25 min |
| Aug 4, 3:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 4, 5:56 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| Aug 17, 7:23 PM EDT | Severe Thunderstorm Warning | PBZ | 22 min |
| Aug 17, 7:41 PM EDT | Tornado Warning | PBZ | 19 min |
| Aug 17, 8:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Aug 17, 9:36 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Aug 19, 2:13 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 19, 2:45 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 21, 5:14 PM EDT | Special Weather Statement | PBZ | 31 min |
| Aug 22, 12:39 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 22, 1:23 PM EDT | Severe Thunderstorm Warning | PBZ | 52 min |
| Aug 22, 2:44 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 22, 4:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Sep 14, 9:08 PM EDT | Dense Fog Advisory | PBZ | 13 hr |
| Sep 15, 9:30 PM EDT | Dense Fog Advisory | PBZ | 12 hr |
| Sep 30, 1:01 PM EDT | Frost Advisory | PBZ | 20 hr |
| Oct 10, 1:40 AM EDT | Dense Fog Advisory | PBZ | 8 hr |
| Oct 15, 3:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Oct 15, 3:29 PM EDT | Special Weather Statement | PBZ | 61 min |
| Nov 5, 3:05 AM EST | Flash Flood Watch | PBZ | 25 hr |
| Nov 5, 4:51 PM EST | Mesoscale Discussion | SPC | 114 min |
| Nov 5, 5:28 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Nov 5, 6:46 PM EST | Severe Thunderstorm Warning | PBZ | 44 min |
| Nov 5, 7:26 PM EST | Severe Thunderstorm Warning | PBZ | 64 min |
| Nov 5, 8:50 PM EST | Areal Flood Advisory | PBZ | 4 hr |
| Nov 18, 9:57 AM EST | Flood Watch | PBZ | 16 hr |
| Nov 18, 10:51 PM EST | Areal Flood Advisory | PBZ | 11 hr |
| Dec 10, 3:01 AM EST | Winter Storm Watch | PBZ | 33 hr |
| Dec 11, 12:05 PM EST | Winter Weather Advisory | PBZ | 39 hr |
| Dec 13, 2:59 AM EST | Winter Weather Advisory | PBZ | 31 hr |
| Dec 23, 2:04 PM EST | Winter Weather Advisory | PBZ | 46 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 | 20 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 26 |
| Special Weather Statement | 26 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 4 |
| Flood Watch | 1 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 10 |
| Cold | |
| Freeze Warning | 2 |
| Frost 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 archive20162018
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.