Alert archive / Pennsylvania / Union County
Weather alerts in Union County, Pennsylvania, 2025
105 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Union County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 105
- Warnings
- 27
- Watches
- 22
- Advisories
- 30
- Busiest month
- June25 alerts
- Busiest day
- June 28, 20255 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Union County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 10 | 38% | 3 | 100% | 5 min |
| Flash flood warnings | 5 | 1 | 80% | 0 |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 14 | 3 | 79% | 5 | 60% | 13 min |
| NWS State College, PA: severe thunderstorm warnings | 212 | 129 | 39% | 354 | 89% | 22 min |
| NWS State College, PA: flash flood warnings | 78 | 35 | 55% | 105 | 94% | 77 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 3, 5:59 PM EST | Snow Squall Warning | CTP | 46 min |
| Jan 4, 11:45 AM EST | Special Weather Statement | CTP | 15 min |
| Jan 18, 2:37 PM EST | Winter Weather Advisory | CTP | 42 hr |
| Jan 19, 3:38 AM EST | Cold Weather Advisory | CTP | 3 days |
| Jan 28, 8:56 AM EST | Special Weather Statement | CTP | 34 min |
| Jan 28, 1:20 PM EST | Wind Advisory | CTP | 28 hr |
| Jan 29, 1:02 PM EST | Special Weather Statement | CTP | 58 min |
| Jan 29, 1:54 PM EST | Special Weather Statement | CTP | 51 min |
| Feb 4, 2:22 PM EST | Winter Weather Advisory | CTP | 46 hr |
| Feb 6, 4:00 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 7, 1:06 PM EST | Winter Weather Advisory | CTP | 38 hr |
| Feb 8, 3:42 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 11, 2:59 PM EST | Winter Weather Advisory | CTP | 37 hr |
| Feb 14, 4:20 AM EST | Winter Weather Advisory | CTP | 53 hr |
| Feb 15, 2:33 AM EST | High Wind Watch | CTP | 25 hr |
| Feb 16, 3:12 AM EST | High Wind Warning | CTP | 37 hr |
| Feb 16, 3:12 AM EST | Wind Advisory | CTP | 37 hr |
| Feb 16, 10:08 AM EST | Dense Fog Advisory | CTP | 4 hr |
| Feb 17, 1:32 AM EST | Special Weather Statement | CTP | 43 min |
| Feb 17, 9:45 AM EST | Special Weather Statement | CTP | 60 min |
| Mar 6, 2:08 AM EST | Wind Advisory | CTP | 26 hr |
| Mar 16, 12:50 PM EDT | Tornado Watch | SPC | 7 hr |
| Mar 16, 2:07 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Mar 16, 4:16 PM EDT | Special Weather Statement | CTP | 29 min |
| Mar 16, 4:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Apr 14, 4:05 AM EDT | Wind Advisory | CTP | 40 hr |
| Apr 15, 1:58 PM EDT | Severe Thunderstorm Warning | CTP | 32 min |
| Apr 15, 2:08 PM EDT | Special Weather Statement | CTP | 37 min |
| Apr 16, 3:38 AM EDT | Frost Advisory | CTP | 29 hr |
| Apr 19, 1:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Apr 19, 3:47 PM EDT | Special Weather Statement | CTP | 28 min |
| Apr 29, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 29, 7:16 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| May 1, 6:35 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 2, 5:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 6, 1:55 PM EDT | Severe Thunderstorm Warning | CTP | 50 min |
| May 8, 4:31 PM EDT | Flash Flood Warning | CTP | 2 hr |
| Jun 5, 5:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 9, 4:00 AM EDT | Flood Watch | CTP | 24 hr |
| Jun 9, 9:11 PM EDT | Severe Thunderstorm Warning | CTP | 49 min |
| Jun 9, 9:56 PM EDT | Severe Thunderstorm Warning | CTP | 49 min |
| Jun 9, 10:56 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Jun 10, 12:03 AM EDT | Flash Flood Warning | CTP | 3 hr |
| Jun 12, 4:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 2:41 AM EDT | Flood Watch | CTP | 20 hr |
| Jun 17, 3:14 AM EDT | Flood Watch | CTP | 19 hr |
| Jun 18, 9:17 PM EDT | Severe Thunderstorm Warning | CTP | 43 min |
| Jun 19, 7:20 PM EDT | Severe Thunderstorm Warning | CTP | 70 min |
| Jun 20, 3:42 AM EDT | Extreme Heat Watch | CTP | 23 hr |
| Jun 21, 3:02 AM EDT | Heat Advisory | CTP | 5 days |
| Jun 21, 3:02 AM EDT | Extreme Heat Warning | CTP | 5 days |
| Jun 22, 3:28 PM EDT | Heat Advisory | CTP | 3 days |
| Jun 26, 12:36 PM EDT | Flood Watch | CTP | 10 hr |
| Jun 26, 1:54 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 2:20 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 26, 3:26 PM EDT | Severe Thunderstorm Warning | CTP | 64 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, 2:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 28, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | 50 min |
| Jun 28, 4:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 30, 12:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 1, 2:23 AM EDT | Flood Watch | CTP | 20 hr |
| Jul 1, 12:59 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 3, 1:30 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 7, 7:16 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| Jul 11, 7:20 PM EDT | Severe Thunderstorm Warning | CTP | 25 min |
| Jul 11, 7:56 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Jul 13, 10:32 AM EDT | Flood Watch | CTP | 14 hr |
| Jul 13, 1:23 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 14, 2:22 AM EDT | Flood Watch | CTP | 17 hr |
| Jul 14, 1:42 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Jul 14, 4:24 PM EDT | Areal Flood Warning | CTP | 8 hr |
| Jul 16, 12:03 PM EDT | Flood Watch | CTP | 12 hr |
| Jul 24, 1:35 AM EDT | Heat Advisory | CTP | 41 hr |
| Jul 25, 1:41 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 25, 2:06 PM EDT | Severe Thunderstorm Warning | CTP | 39 min |
| Jul 25, 2:44 PM EDT | Severe Thunderstorm Warning | CTP | 46 min |
| Jul 25, 5:38 PM EDT | Severe Thunderstorm Warning | CTP | 37 min |
| Jul 25, 7:11 PM EDT | Severe Thunderstorm Warning | CTP | 49 min |
| Jul 29, 1:34 AM EDT | Heat Advisory | CTP | 42 hr |
| Jul 30, 2:19 PM EDT | Flood Watch | CTP | 29 hr |
| Aug 24, 1:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 24, 10:16 PM EDT | Severe Thunderstorm Warning | CTP | 44 min |
| Aug 25, 5:12 AM EDT | Dense Fog Advisory | CTP | 4 hr |
| Sep 23, 9:57 PM EDT | Dense Fog Advisory | CTP | 12 hr |
| Sep 28, 3:31 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| Oct 8, 2:15 AM EDT | Freeze Watch | CTP | 23 hr |
| Oct 9, 1:41 AM EDT | Freeze Warning | CTP | 31 hr |
| Oct 19, 7:59 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 30, 12:46 PM EDT | Wind Advisory | CTP | 35 hr |
| Nov 4, 1:08 PM EST | High Wind Watch | CTP | 13 hr |
| Nov 4, 1:08 PM EST | Wind Advisory | CTP | 39 hr |
| Nov 15, 12:39 PM EST | Wind Advisory | CTP | 31 hr |
| Nov 19, 11:28 PM EST | Dense Fog Advisory | CTP | 12 hr |
| Dec 1, 1:57 AM EST | Winter Weather Advisory | CTP | 44 hr |
| Dec 2, 9:51 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Dec 11, 6:21 AM EST | Snow Squall Warning | CTP | 39 min |
| Dec 18, 1:47 AM EST | Wind Advisory | CTP | 46 hr |
| Dec 22, 5:50 PM EST | Winter Weather Advisory | CTP | 18 hr |
| Dec 24, 2:17 AM EST | Winter Storm Watch | CTP | 36 hr |
| Dec 25, 2:15 PM EST | Winter Weather Advisory | CTP | 41 hr |
| Dec 27, 12:09 PM EST | Winter Weather Advisory | CTP | 40 hr |
| Dec 28, 12:49 PM EST | Wind Advisory | CTP | 51 hr |
| Dec 28, 9:56 PM EST | Dense Fog Advisory | CTP | 10 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 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.