Alert archive / Pennsylvania / Jefferson County
Weather alerts in Jefferson County, Pennsylvania, 2015
120 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Jefferson County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 120
- Warnings
- 23
- Watches
- 15
- Advisories
- 33
- Busiest month
- June24 alerts
- Busiest day
- May 31, 20157 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 Jefferson County in 2015 had a tornado report inside them.
Jefferson County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 16 | 13 | 19% | 14 | 79% | 20 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 13 | 1 | 92% | 2 | 50% | 5 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 174 | 133 | 24% | 505 | 84% | 19 min |
| NWS Pittsburgh, PA: flash flood warnings | 49 | 38 | 22% | 140 | 91% | 106 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 2, 3:25 PM EST | Freezing Rain Advisory | PBZ | 18 hr |
| Jan 3, 9:52 AM EST | Freezing Rain Advisory | PBZ | 9 hr |
| Jan 3, 9:59 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 6, 3:30 PM EST | Wind Chill Advisory | PBZ | 46 hr |
| Jan 6, 3:30 PM EST | Winter Weather Advisory | PBZ | 30 hr |
| Jan 7, 10:47 AM EST | Special Weather Statement | PBZ | 43 min |
| Jan 7, 11:44 AM EST | Special Weather Statement | PBZ | 91 min |
| Jan 7, 3:35 PM EST | Special Weather Statement | PBZ | 115 min |
| Jan 7, 6:06 PM EST | Special Weather Statement | PBZ | 114 min |
| Jan 8, 10:57 PM EST | Special Weather Statement | PBZ | 48 min |
| Jan 9, 4:55 AM EST | Wind Chill Advisory | PBZ | 32 hr |
| Jan 9, 8:45 AM EST | Special Weather Statement | PBZ | 60 min |
| Jan 9, 8:52 AM EST | Special Weather Statement | PBZ | 113 min |
| Jan 11, 3:30 AM EST | Winter Weather Advisory | PBZ | 36 hr |
| Jan 20, 3:30 PM EST | Winter Weather Advisory | PBZ | 27 hr |
| Jan 24, 3:30 PM EST | Winter Weather Advisory | PBZ | 62 hr |
| Jan 24, 5:51 PM EST | Freezing Rain Advisory | PBZ | 7 hr |
| Jan 27, 7:32 AM EST | Special Weather Statement | PBZ | 58 min |
| Jan 27, 8:30 AM EST | Special Weather Statement | PBZ | 2 hr |
| Jan 28, 1:43 PM EST | Winter Weather Advisory | PBZ | 53 hr |
| Jan 30, 4:05 AM EST | Wind Chill Advisory | PBZ | 28 hr |
| Jan 30, 12:06 PM EST | Winter Storm Watch | PBZ | 26 hr |
| Jan 31, 2:28 PM EST | Winter Storm Warning | PBZ | 44 hr |
| Feb 4, 6:17 PM EST | Special Weather Statement | PBZ | 3 hr |
| Feb 5, 3:59 AM EST | Wind Chill Advisory | PBZ | 29 hr |
| Feb 9, 12:30 AM EST | Freezing Rain Advisory | PBZ | 8 hr |
| Feb 12, 3:22 AM EST | Wind Chill Advisory | PBZ | 32 hr |
| Feb 13, 3:08 AM EST | Wind Chill Watch | PBZ | 24 hr |
| Feb 13, 2:45 PM EST | Winter Weather Advisory | PBZ | 33 hr |
| Feb 14, 2:59 AM EST | Wind Chill Warning | PBZ | 55 hr |
| Feb 14, 1:33 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 18, 4:08 AM EST | Wind Chill Advisory | PBZ | 56 hr |
| Feb 18, 9:42 PM EST | Wind Chill Warning | PBZ | 38 hr |
| Feb 20, 2:45 PM EST | Winter Storm Warning | PBZ | 30 hr |
| Feb 21, 8:15 PM EST | Freezing Rain Advisory | PBZ | 8 hr |
| Feb 22, 4:36 AM EST | Wind Chill Advisory | PBZ | 54 hr |
| Feb 27, 3:22 PM EST | Winter Storm Watch | PBZ | 24 hr |
| Feb 28, 3:11 PM EST | Winter Weather Advisory | PBZ | 30 hr |
| Mar 2, 2:41 PM EST | Winter Weather Advisory | PBZ | 28 hr |
| Mar 3, 8:11 PM EST | Areal Flood Advisory | PBZ | 12 hr |
| Mar 7, 1:11 PM EST | Special Weather Statement | PBZ | 49 min |
| Mar 10, 6:03 PM EDT | Dense Fog Advisory | PBZ | 15 hr |
| Mar 13, 3:03 AM EDT | Flood Watch | PBZ | 34 hr |
| Apr 9, 4:29 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 9, 6:43 PM EDT | Severe Thunderstorm Warning | PBZ | 32 min |
| Apr 9, 7:26 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Apr 20, 3:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 11, 5:47 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 11, 7:26 PM EDT | Mesoscale Discussion | SPC | 64 min |
| May 11, 9:47 PM EDT | Special Weather Statement | PBZ | 58 min |
| May 16, 1:35 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 21, 2:56 PM EDT | Freeze Watch | PBZ | 12 hr |
| May 22, 3:17 AM EDT | Freeze Warning | PBZ | 28 hr |
| May 30, 7:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 31, 11:05 AM EDT | Severe Thunderstorm Warning | PBZ | 25 min |
| May 31, 11:30 AM EDT | Severe Thunderstorm Warning | PBZ | 30 min |
| May 31, 12:51 PM EDT | Mesoscale Discussion | SPC | 114 min |
| May 31, 2:40 PM EDT | Severe Thunderstorm Warning | PBZ | 35 min |
| May 31, 6:35 PM EDT | Severe Thunderstorm Warning | PBZ | 55 min |
| May 31, 7:30 PM EDT | Special Weather Statement | PBZ | 45 min |
| May 31, 7:39 PM EDT | Severe Thunderstorm Warning | PBZ | 36 min |
| Jun 11, 2:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 11, 4:59 PM EDT | Special Weather Statement | PBZ | 31 min |
| Jun 11, 5:41 PM EDT | Severe Thunderstorm Warning | PBZ | 34 min |
| Jun 12, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 12, 4:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jun 12, 5:58 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jun 12, 6:15 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Jun 12, 6:45 PM EDT | Severe Thunderstorm Warning | PBZ | 30 min |
| Jun 12, 6:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 14, 2:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jun 14, 3:15 PM EDT | Flash Flood Watch | PBZ | 41 hr |
| Jun 18, 5:41 PM EDT | Special Weather Statement | PBZ | 34 min |
| Jun 23, 5:30 AM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 23, 5:57 AM EDT | Special Weather Statement | PBZ | 63 min |
| Jun 23, 7:29 AM EDT | Special Weather Statement | PBZ | 31 min |
| Jun 23, 7:53 AM EDT | Severe Thunderstorm Warning | PBZ | 22 min |
| Jun 23, 8:17 AM EDT | Special Weather Statement | PBZ | 13 min |
| Jun 23, 11:19 AM EDT | Special Weather Statement | PBZ | 26 min |
| Jun 26, 3:58 AM EDT | Flood Watch | PBZ | 45 hr |
| Jun 30, 12:58 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 30, 2:58 PM EDT | Areal Flood Advisory | PBZ | 2 hr |
| Jun 30, 3:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 30, 7:27 PM EDT | Special Weather Statement | PBZ | 33 min |
| Jun 30, 7:38 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jul 7, 4:31 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 8:31 PM EDT | Special Weather Statement | PBZ | 44 min |
| Jul 7, 8:58 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jul 9, 1:27 PM EDT | Tornado Watch | SPC | 6 hr |
| Jul 9, 1:54 PM EDT | Tornado Warning | PBZ | 21 min |
| Jul 9, 3:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 9, 3:29 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Jul 14, 12:40 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 14, 3:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 18, 1:42 AM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jul 19, 2:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 19, 3:18 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 19, 7:53 PM EDT | Severe Thunderstorm Warning | PBZ | 27 min |
| Jul 19, 7:55 PM EDT | Areal Flood Advisory | PBZ | 2 hr |
| Jul 19, 8:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 19, 9:10 PM EDT | Areal Flood Advisory | PBZ | 2 hr |
| Jul 19, 10:08 PM EDT | Areal Flood Advisory | PBZ | 2 hr |
| Jul 26, 2:10 PM EDT | Special Weather Statement | PBZ | 35 min |
| Jul 26, 3:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 3, 7:11 PM EDT | Severe Thunderstorm Warning | PBZ | 34 min |
| Aug 3, 9:38 PM EDT | Severe Thunderstorm Warning | PBZ | 52 min |
| Aug 20, 11:49 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 11, 4:36 AM EDT | Dense Fog Advisory | PBZ | 5 hr |
| Sep 19, 4:10 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 29, 9:34 AM EDT | Flash Flood Watch | PBZ | 18 hr |
| Sep 29, 5:52 PM EDT | Areal Flood Advisory | PBZ | 6 hr |
| Sep 29, 7:29 PM EDT | Areal Flood Warning | PBZ | 8 hr |
| Nov 11, 2:14 PM EST | Wind Advisory | PBZ | 29 hr |
| Nov 21, 9:18 PM EST | Special Weather Statement | PBZ | 72 min |
| Dec 5, 1:22 AM EST | Dense Fog Advisory | PBZ | 11 hr |
| Dec 5, 6:50 PM EST | Dense Fog Advisory | PBZ | 17 hr |
| Dec 18, 7:13 PM EST | Special Weather Statement | PBZ | 3 hr |
| Dec 18, 8:49 PM EST | Special Weather Statement | PBZ | 26 min |
| Dec 18, 9:25 PM EST | Special Weather Statement | PBZ | 80 min |
| Dec 27, 2:52 PM EST | Freezing Rain Advisory | PBZ | 37 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 archive20142016
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.