Alert archive / Pennsylvania / Mercer County
Weather alerts in Mercer County, Pennsylvania, 2023
88 weather alerts in 2023, 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 2023. Tap one for its archive.
- Alerts
- 88
- Warnings
- 23
- Watches
- 14
- Advisories
- 17
- Busiest month
- July22 alerts
- Busiest day
- March 25, 20235 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 2023 had a tornado report inside them.
Mercer County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 14 | 14 | 0% | 38 | 82% | 25 min |
| Flash flood warnings | 2 | 1 | 50% | 1 | 100% | 52 min |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 15 | 2 | 87% | 7 | 57% | 15 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 133 | 98 | 26% | 502 | 76% | 21 min |
| NWS Pittsburgh, PA: flash flood warnings | 32 | 19 | 41% | 63 | 71% | 49 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 19, 4:49 PM EST | Mesoscale Discussion | SPC | 86 min |
| Jan 19, 7:38 PM EST | Special Weather Statement | PBZ | 37 min |
| Jan 19, 8:13 PM EST | Special Weather Statement | PBZ | 47 min |
| Jan 22, 1:03 PM EST | Mesoscale Discussion | SPC | 117 min |
| Jan 24, 3:31 AM EST | Winter Weather Advisory | PBZ | 35 hr |
| Jan 30, 5:42 AM EST | Winter Weather Advisory | PBZ | 4 hr |
| Feb 2, 9:41 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Feb 2, 10:18 PM EST | Special Weather Statement | PBZ | 42 min |
| Feb 8, 11:21 AM EST | Wind Advisory | PBZ | 43 hr |
| Feb 21, 11:56 PM EST | Winter Weather Advisory | PBZ | 13 hr |
| Mar 9, 3:42 AM EST | Winter Weather Advisory | PBZ | 31 hr |
| Mar 13, 5:59 PM EDT | Special Weather Statement | PBZ | 46 min |
| Mar 13, 6:47 PM EDT | Special Weather Statement | PBZ | 58 min |
| Mar 13, 10:42 PM EDT | Special Weather Statement | PBZ | 48 min |
| Mar 18, 1:22 PM EDT | Special Weather Statement | PBZ | 38 min |
| Mar 18, 1:56 PM EDT | Special Weather Statement | PBZ | 49 min |
| Mar 18, 2:45 PM EDT | Special Weather Statement | PBZ | 60 min |
| Mar 23, 4:30 PM EDT | Severe Thunderstorm Warning | PBZ | 30 min |
| Mar 23, 4:42 PM EDT | Severe Thunderstorm Warning | PBZ | 14 min |
| Mar 24, 1:26 PM EDT | Wind Advisory | PBZ | 34 hr |
| Mar 25, 11:50 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Mar 25, 1:01 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 25, 2:07 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Mar 25, 2:49 PM EDT | Special Weather Statement | PBZ | 26 min |
| Mar 25, 3:10 PM EDT | Severe Thunderstorm Warning | PBZ | 35 min |
| Mar 29, 5:13 PM EDT | Special Weather Statement | PBZ | 62 min |
| Mar 29, 6:43 PM EDT | Special Weather Statement | PBZ | 62 min |
| Mar 31, 1:32 PM EDT | Wind Advisory | PBZ | 30 hr |
| Apr 1, 11:15 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 1, 11:59 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 1, 12:57 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Apr 1, 1:34 PM EDT | Severe Thunderstorm Warning | PBZ | 26 min |
| Apr 5, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 5, 6:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 11, 4:04 PM EDT | Fire Weather Watch | PBZ | 18 hr |
| Apr 12, 9:38 AM EDT | Red Flag Warning | PBZ | 10 hr |
| Apr 18, 11:39 AM EDT | Freeze Warning | PBZ | 21 hr |
| Apr 24, 2:48 AM EDT | Freeze Watch | PBZ | 9 hr |
| Apr 24, 11:22 AM EDT | Freeze Warning | PBZ | 22 hr |
| Apr 25, 8:00 PM EDT | Freeze Watch | PBZ | 17 hr |
| Apr 26, 12:59 PM EDT | Freeze Warning | PBZ | 20 hr |
| May 4, 1:21 PM EDT | Frost Advisory | PBZ | 20 hr |
| Jun 16, 1:39 PM EDT | Special Weather Statement | PBZ | 36 min |
| Jul 4, 5:03 AM EDT | Dense Fog Advisory | PBZ | 4 hr |
| Jul 6, 4:22 PM EDT | Special Weather Statement | PBZ | 8 min |
| Jul 6, 4:38 PM EDT | Special Weather Statement | PBZ | 37 min |
| Jul 6, 6:04 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jul 20, 2:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 20, 4:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 20, 6:19 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 20, 6:51 PM EDT | Severe Thunderstorm Warning | PBZ | 54 min |
| Jul 20, 7:40 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Jul 20, 8:02 PM EDT | Tornado Warning | PBZ | 28 min |
| Jul 20, 8:18 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jul 20, 8:22 PM EDT | Severe Thunderstorm Warning | PBZ | 53 min |
| Jul 20, 9:02 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jul 20, 9:12 PM EDT | Severe Thunderstorm Warning | PBZ | 63 min |
| Jul 26, 7:47 PM EDT | Special Weather Statement | PBZ | 43 min |
| Jul 26, 7:58 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jul 26, 8:15 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Jul 27, 3:05 AM EDT | Heat Advisory | PBZ | 38 hr |
| Jul 28, 2:18 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 28, 4:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jul 29, 2:52 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 29, 6:06 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Aug 12, 11:37 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 12:50 PM EDT | Tornado Watch | SPC | 8 hr |
| Aug 12, 4:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 12, 5:07 PM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| Aug 12, 6:17 PM EDT | Areal Flood Advisory | PBZ | 99 min |
| Aug 17, 9:25 PM EDT | Special Weather Statement | PBZ | 35 min |
| Aug 17, 9:59 PM EDT | Special Weather Statement | PBZ | 31 min |
| Aug 23, 2:44 PM EDT | Flood Watch | PBZ | 10 hr |
| Aug 24, 9:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 24, 9:48 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 24, 11:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 25, 12:45 AM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Aug 25, 1:11 AM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| Sep 13, 3:27 AM EDT | Dense Fog Advisory | PBZ | 7 hr |
| Oct 1, 2:56 AM EDT | Dense Fog Advisory | PBZ | 7 hr |
| Oct 21, 2:03 PM EDT | Freeze Watch | PBZ | 23 hr |
| Oct 22, 2:33 AM EDT | Freeze Warning | PBZ | 30 hr |
| Oct 29, 2:48 PM EDT | Freeze Watch | PBZ | 12 hr |
| Oct 30, 2:47 AM EDT | Freeze Warning | PBZ | 31 hr |
| Oct 31, 1:51 PM EDT | Winter Weather Advisory | PBZ | 21 hr |
| Nov 26, 2:30 PM EST | Winter Weather Advisory | PBZ | 52 hr |
| Dec 3, 1:36 PM EST | Mesoscale Discussion | SPC | 114 min |
| Dec 17, 2:11 PM EST | Winter Weather Advisory | PBZ | 44 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 | 14 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 16 |
| Special Weather Statement | 18 |
| Flooding | |
| Flash Flood Warning | 2 |
| Flood Watch | 1 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 4 |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| 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 archive20222024
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.