Alert archive / Pennsylvania / Jefferson County
Weather alerts in Jefferson County, Pennsylvania, 2025
136 weather alerts in 2025, 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 2025. Tap one for its archive.
- Alerts
- 136
- Warnings
- 40
- Watches
- 19
- Advisories
- 35
- Busiest month
- June35 alerts
- Busiest day
- June 9, 20258 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 1 tornado warnings covering Jefferson County in 2025 had a tornado report inside them.
Jefferson County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 0 | ||
| Severe thunderstorm warnings | 21 | 14 | 33% | 18 | 83% | 28 min |
| Flash flood warnings | 7 | 4 | 43% | 6 | 100% | 78 min |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 23 | 6 | 74% | 14 | 79% | 6 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 273 | 175 | 36% | 988 | 93% | 24 min |
| NWS Pittsburgh, PA: flash flood warnings | 125 | 93 | 26% | 452 | 92% | 70 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, 12:37 PM EST | Winter Weather Advisory | PBZ | 45 hr |
| Jan 3, 2:33 PM EST | Snow Squall Warning | PBZ | 42 min |
| Jan 3, 3:14 PM EST | Snow Squall Warning | PBZ | 46 min |
| Jan 4, 4:23 AM EST | Special Weather Statement | PBZ | 52 min |
| Jan 4, 1:33 PM EST | Special Weather Statement | PBZ | 87 min |
| Jan 8, 10:35 AM EST | Special Weather Statement | PBZ | 55 min |
| Jan 8, 11:27 AM EST | Special Weather Statement | PBZ | 63 min |
| Jan 9, 1:34 PM EST | Winter Weather Advisory | PBZ | 53 hr |
| Jan 15, 1:41 PM EST | Winter Weather Advisory | PBZ | 38 hr |
| Jan 17, 10:48 AM EST | Extreme Cold Watch | PBZ | 40 hr |
| Jan 19, 3:25 AM EST | Cold Weather Advisory | PBZ | 3 days |
| Jan 28, 6:26 AM EST | Special Weather Statement | PBZ | 64 min |
| Jan 28, 7:30 AM EST | Special Weather Statement | PBZ | 60 min |
| Jan 29, 11:13 AM EST | Snow Squall Warning | PBZ | 47 min |
| Jan 29, 11:58 AM EST | Snow Squall Warning | PBZ | 62 min |
| Jan 29, 12:56 PM EST | Special Weather Statement | PBZ | 34 min |
| Jan 29, 1:15 PM EST | Snow Squall Warning | PBZ | 39 min |
| Jan 29, 1:32 PM EST | Special Weather Statement | PBZ | 58 min |
| Jan 29, 1:48 PM EST | Snow Squall Warning | PBZ | 27 min |
| Jan 29, 2:12 PM EST | Snow Squall Warning | PBZ | 63 min |
| Feb 2, 2:41 PM EST | Winter Weather Advisory | PBZ | 13 hr |
| Feb 3, 1:23 PM EST | Winter Storm Watch | PBZ | 25 hr |
| Feb 4, 2:33 PM EST | Winter Weather Advisory | PBZ | 43 hr |
| Feb 6, 4:00 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 7, 1:43 PM EST | Winter Weather Advisory | PBZ | 31 hr |
| Feb 8, 3:42 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 11, 2:34 PM EST | Winter Weather Advisory | PBZ | 37 hr |
| Feb 13, 9:09 PM EST | Special Weather Statement | PBZ | 66 min |
| Feb 13, 9:57 PM EST | Special Weather Statement | PBZ | 78 min |
| Feb 13, 11:15 PM EST | Special Weather Statement | PBZ | 45 min |
| Feb 14, 2:36 PM EST | Winter Weather Advisory | PBZ | 26 hr |
| Feb 15, 2:56 PM EST | Winter Weather Advisory | PBZ | 46 hr |
| Feb 17, 2:54 AM EST | Cold Weather Advisory | PBZ | 31 hr |
| Feb 26, 3:22 AM EST | Dense Fog Advisory | PBZ | 7 hr |
| Mar 5, 2:19 PM EST | Mesoscale Discussion | SPC | 116 min |
| Mar 5, 4:27 PM EST | Severe Thunderstorm Warning | PBZ | 23 min |
| Mar 16, 10:04 AM EDT | Mesoscale Discussion | SPC | 86 min |
| Mar 16, 10:31 AM EDT | Tornado Watch | SPC | 5 hr |
| Mar 16, 12:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Mar 16, 12:48 PM EDT | Severe Thunderstorm Warning | PBZ | 57 min |
| Mar 16, 1:21 PM EDT | Severe Thunderstorm Warning | PBZ | 54 min |
| Mar 16, 2:07 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Apr 3, 4:37 AM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| Apr 3, 4:54 AM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 15, 12:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 19, 1:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Apr 19, 1:54 PM EDT | Severe Thunderstorm Warning | PBZ | 22 min |
| Apr 25, 11:48 PM EDT | Flash Flood Warning | PBZ | 2 hr |
| Apr 29, 2:41 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 29, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 29, 5:21 PM EDT | Severe Thunderstorm Warning | PBZ | 54 min |
| Apr 29, 6:08 PM EDT | Severe Thunderstorm Warning | PBZ | 26 min |
| May 1, 1:22 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 1, 6:35 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 2, 12:49 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 2, 5:26 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| May 2, 5:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 2, 6:04 PM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| May 4, 7:12 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 4, 7:52 PM EDT | Severe Thunderstorm Warning | PBZ | 20 min |
| May 9, 2:19 AM EDT | Frost Advisory | PBZ | 30 hr |
| May 16, 4:36 AM EDT | Mesoscale Discussion | SPC | 84 min |
| May 16, 4:38 AM EDT | Mesoscale Discussion | SPC | 97 min |
| May 16, 2:32 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 16, 3:14 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| May 19, 3:29 AM EDT | Frost Advisory | PBZ | 28 hr |
| Jun 1, 1:58 PM EDT | Frost Advisory | PBZ | 18 hr |
| Jun 5, 1:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 5, 5:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 9, 2:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jun 9, 2:46 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 9, 4:49 PM EDT | Severe Thunderstorm Warning | PBZ | 56 min |
| Jun 9, 4:58 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jun 9, 5:22 PM EDT | Tornado Warning | PBZ | 38 min |
| Jun 9, 6:52 PM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| Jun 9, 7:13 PM EDT | Severe Thunderstorm Warning | PBZ | 42 min |
| Jun 9, 7:14 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jun 14, 3:06 AM EDT | Flood Watch | PBZ | 20 hr |
| Jun 17, 3:17 AM EDT | Flood Watch | PBZ | 27 hr |
| Jun 17, 2:17 PM EDT | Flash Flood Warning | PBZ | 7 hr |
| Jun 17, 7:13 PM EDT | Flash Flood Warning | PBZ | 2 hr |
| Jun 18, 9:31 AM EDT | Flash Flood Warning | PBZ | 5 hr |
| Jun 18, 5:47 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jun 18, 6:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 18, 7:21 PM EDT | Flash Flood Warning | PBZ | 86 min |
| Jun 18, 8:14 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 18, 11:57 PM EDT | Severe Thunderstorm Warning | PBZ | 63 min |
| Jun 20, 2:02 AM EDT | Extreme Heat Watch | PBZ | 23 hr |
| Jun 21, 1:28 AM EDT | Heat Advisory | PBZ | 7 days |
| Jun 25, 2:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 26, 2:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 26, 5:04 PM EDT | Severe Thunderstorm Warning | PBZ | 15 min |
| Jun 27, 10:11 AM EDT | Flood Watch | PBZ | 14 hr |
| Jun 27, 5:42 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Jun 28, 10:51 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 28, 11:48 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 28, 12:05 PM EDT | Severe Thunderstorm Warning | PBZ | 55 min |
| Jun 28, 12:44 PM EDT | Severe Thunderstorm Warning | PBZ | 61 min |
| Jun 28, 4:29 PM EDT | Flash Flood Warning | PBZ | 108 min |
| Jun 30, 12:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 30, 12:24 PM EDT | Flood Watch | PBZ | 10 hr |
| Jul 2, 5:25 AM EDT | Dense Fog Advisory | PBZ | 4 hr |
| Jul 7, 2:04 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 3:33 PM EDT | Severe Thunderstorm Warning | PBZ | 42 min |
| Jul 10, 12:51 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 13, 1:23 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 26, 7:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Sep 5, 1:10 AM EDT | Dense Fog Advisory | PBZ | 8 hr |
| Sep 23, 11:08 PM EDT | Dense Fog Advisory | PBZ | 10 hr |
| Sep 26, 1:44 AM EDT | Dense Fog Advisory | PBZ | 8 hr |
| Sep 28, 4:01 AM EDT | Dense Fog Advisory | PBZ | 20 min |
| Sep 28, 4:21 AM EDT | Dense Fog Advisory | PBZ | 5 hr |
| Oct 1, 11:44 AM EDT | Frost Advisory | PBZ | 15 hr |
| Oct 8, 2:39 AM EDT | Frost Advisory | PBZ | 30 hr |
| Oct 8, 2:39 AM EDT | Freeze Watch | PBZ | 34 hr |
| Oct 9, 12:18 PM EDT | Freeze Warning | PBZ | 21 hr |
| Oct 15, 1:14 AM EDT | Frost Advisory | PBZ | 32 hr |
| Oct 15, 12:25 PM EDT | Freeze Watch | PBZ | 24 hr |
| Oct 16, 12:40 PM EDT | Freeze Warning | PBZ | 20 hr |
| Nov 15, 6:14 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Nov 16, 12:53 AM EST | Winter Weather Advisory | PBZ | 35 hr |
| Nov 19, 11:55 PM EST | Freezing Fog Advisory | PBZ | 10 hr |
| Nov 20, 7:47 PM EST | Dense Fog Advisory | PBZ | 13 hr |
| Dec 1, 1:09 AM EST | Winter Weather Advisory | PBZ | 45 hr |
| Dec 2, 4:54 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 9, 1:11 AM EST | Winter Weather Advisory | PBZ | 3 days |
| Dec 12, 11:41 AM EST | Winter Weather Advisory | PBZ | 67 hr |
| Dec 19, 3:59 PM EST | Snow Squall Warning | PBZ | 61 min |
| Dec 22, 10:33 PM EST | Winter Weather Advisory | PBZ | 11 hr |
| Dec 24, 2:05 AM EST | Winter Storm Watch | PBZ | 35 hr |
| Dec 25, 12:42 PM EST | Ice Storm Warning | PBZ | 39 hr |
| Dec 26, 11:13 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 28, 1:13 AM EST | Wind Advisory | PBZ | 46 hr |
| Dec 28, 1:31 PM EST | Winter Weather Advisory | PBZ | 47 hr |
| Dec 30, 1:04 PM EST | Winter Weather Advisory | PBZ | 45 hr |
| Dec 31, 6:42 PM EST | Mesoscale Discussion | SPC | 5 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 | 21 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 31 |
| Special Weather Statement | 11 |
| Flooding | |
| Flash Flood Warning | 7 |
| Flood Watch | 4 |
| Winter | |
| Ice Storm Warning | 1 |
| Snow Squall Warning | 8 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 16 |
| Heat | |
| Extreme Heat Watch | 1 |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Extreme Cold Watch | 1 |
| Freeze Watch | 2 |
| Cold Weather Advisory | 2 |
| Frost Advisory | 6 |
| Wind and dust | |
| Wind Advisory | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
| Freezing Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
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.