Alert archive / Pennsylvania / Union County
Weather alerts in Union County, Pennsylvania, 2024
146 weather alerts in 2024, 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 2024. Tap one for its archive.
- Alerts
- 146
- Warnings
- 36
- Watches
- 23
- Advisories
- 38
- Busiest month
- August28 alerts
- Busiest day
- August 9, 20247 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, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 14 | 11 | 21% | 3 | 67% | 5 min |
| Flash flood warnings | 2 | 1 | 50% | 2 | 100% | 71 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 16 | 0 | 100% | 4 | 0% | |
| NWS State College, PA: severe thunderstorm warnings | 188 | 125 | 34% | 422 | 74% | 20 min |
| NWS State College, PA: flash flood warnings | 33 | 23 | 30% | 65 | 78% | 59 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 4, 2:29 PM EST | Winter Storm Watch | CTP | 22 hr |
| Jan 5, 12:23 PM EST | Winter Storm Warning | CTP | 37 hr |
| Jan 6, 11:47 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 6, 4:27 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 8, 2:14 AM EST | Flood Watch | CTP | 49 hr |
| Jan 8, 4:08 AM EST | Wind Advisory | CTP | 62 hr |
| Jan 9, 10:52 PM EST | Areal Flood Advisory | CTP | 4 hr |
| Jan 12, 4:14 AM EST | Wind Advisory | CTP | 41 hr |
| Jan 14, 2:34 AM EST | Wind Advisory | CTP | 14 hr |
| Jan 14, 8:12 AM EST | Snow Squall Warning | CTP | 33 min |
| Jan 14, 8:25 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 14, 8:26 AM EST | Snow Squall Warning | CTP | 64 min |
| Jan 14, 9:29 AM EST | Snow Squall Warning | CTP | 31 min |
| Jan 14, 10:05 AM EST | Snow Squall Warning | CTP | 25 min |
| Jan 15, 4:01 AM EST | Winter Weather Advisory | CTP | 34 hr |
| Jan 18, 4:25 AM EST | Winter Weather Advisory | CTP | 66 hr |
| Jan 22, 10:03 AM EST | Winter Weather Advisory | CTP | 33 hr |
| Jan 25, 10:43 AM EST | Dense Fog Advisory | CTP | 22 hr |
| Feb 10, 2:46 PM EST | Winter Storm Watch | CTP | 48 hr |
| Feb 11, 2:49 PM EST | Winter Storm Warning | CTP | 43 hr |
| Feb 15, 3:50 PM EST | Wind Advisory | CTP | 18 hr |
| Feb 16, 3:03 AM EST | Winter Weather Advisory | CTP | 28 hr |
| Feb 16, 10:33 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 17, 11:34 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 27, 2:47 PM EST | Wind Advisory | CTP | 37 hr |
| Mar 8, 6:40 AM EST | Dense Fog Advisory | CTP | 3 hr |
| Mar 9, 3:20 AM EST | Wind Advisory | CTP | 62 hr |
| Mar 10, 12:13 PM EDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 10, 5:54 PM EDT | Snow Squall Warning | CTP | 51 min |
| Apr 1, 2:08 PM EDT | Flood Watch | CTP | 60 hr |
| Apr 3, 8:43 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Apr 3, 12:04 PM EDT | River Flood Warning | CTP | 19 hr |
| Apr 4, 3:06 PM EDT | River Flood Warning | CTP | 8 hr |
| Apr 12, 10:25 AM EDT | Wind Advisory | CTP | 32 hr |
| Apr 14, 3:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 14, 4:58 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 14, 6:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 14, 7:05 PM EDT | Severe Thunderstorm Warning | CTP | 25 min |
| Apr 14, 7:10 PM EDT | Severe Thunderstorm Warning | CTP | 35 min |
| Apr 20, 11:26 AM EDT | Frost Advisory | CTP | 21 hr |
| Apr 21, 3:41 AM EDT | Freeze Watch | CTP | 8 hr |
| Apr 21, 11:54 AM EDT | Freeze Warning | CTP | 20 hr |
| Apr 22, 9:45 AM EDT | Frost Advisory | CTP | 22 hr |
| Apr 23, 3:01 PM EDT | Freeze Watch | CTP | 23 hr |
| Apr 24, 1:53 PM EDT | Freeze Warning | CTP | 18 hr |
| Apr 25, 1:32 PM EDT | Frost Advisory | CTP | 18 hr |
| Apr 30, 1:12 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 16, 6:04 AM EDT | Dense Fog Advisory | CTP | 3 hr |
| May 20, 5:18 AM EDT | Dense Fog Advisory | CTP | 4 hr |
| May 22, 2:29 PM EDT | Special Weather Statement | CTP | 31 min |
| May 22, 3:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 22, 4:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 23, 5:35 AM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| May 23, 6:08 AM EDT | Severe Thunderstorm Warning | CTP | 52 min |
| May 23, 7:32 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 26, 12:09 AM EDT | Dense Fog Advisory | CTP | 10 hr |
| May 27, 11:53 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 27, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 27, 4:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| May 29, 2:30 PM EDT | Areal Flood Advisory | CTP | 90 min |
| Jun 14, 2:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 16, 3:20 PM EDT | Heat Advisory | CTP | 7 days |
| Jun 17, 7:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jun 21, 11:38 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 7:20 PM EDT | Special Weather Statement | CTP | 25 min |
| Jun 22, 7:47 PM EDT | Severe Thunderstorm Warning | CTP | 43 min |
| Jun 23, 3:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 23, 4:33 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 23, 7:15 PM EDT | Special Weather Statement | CTP | 30 min |
| Jun 23, 7:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 23, 9:03 PM EDT | Special Weather Statement | CTP | 27 min |
| Jun 26, 12:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 26, 4:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 26, 5:35 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Jun 29, 3:42 AM EDT | Flood Watch | CTP | 15 hr |
| Jun 29, 1:11 PM EDT | Tornado Watch | SPC | 7 hr |
| Jun 29, 4:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 29, 4:13 PM EDT | Severe Thunderstorm Warning | CTP | 47 min |
| Jun 30, 11:09 AM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 30, 12:55 PM EDT | Severe Thunderstorm Warning | CTP | 35 min |
| Jun 30, 1:07 PM EDT | Severe Thunderstorm Warning | CTP | 26 min |
| Jun 30, 1:30 PM EDT | Severe Thunderstorm Warning | CTP | 45 min |
| Jul 7, 2:40 PM EDT | Heat Advisory | CTP | 3 days |
| Jul 10, 12:06 PM EDT | Tornado Watch | SPC | 11 hr |
| Jul 10, 6:02 PM EDT | Severe Thunderstorm Warning | CTP | 43 min |
| Jul 10, 7:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 10, 8:06 PM EDT | Special Weather Statement | CTP | 24 min |
| Jul 13, 2:42 AM EDT | Heat Advisory | CTP | 4 days |
| Jul 16, 2:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 24, 8:15 PM EDT | Severe Thunderstorm Warning | CTP | 45 min |
| Jul 30, 12:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 4:50 PM EDT | Special Weather Statement | CTP | 10 min |
| Aug 3, 12:14 PM EDT | Flood Watch | CTP | 9 hr |
| Aug 6, 10:59 AM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 6, 11:42 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 6, 2:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 6, 4:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Aug 7, 3:24 PM EDT | Flood Watch | CTP | 48 hr |
| Aug 9, 6:05 AM EDT | Special Weather Statement | CTP | 25 min |
| Aug 9, 6:17 AM EDT | Tornado Watch | SPC | 8 hr |
| Aug 9, 6:28 AM EDT | Special Weather Statement | CTP | 32 min |
| Aug 9, 7:06 AM EDT | Flash Flood Warning | CTP | 2 hr |
| Aug 9, 9:30 AM EDT | Areal Flood Warning | CTP | 11 hr |
| Aug 9, 10:22 AM EDT | River Flood Warning | CTP | 22 hr |
| Aug 9, 10:26 AM EDT | Mesoscale Discussion | SPC | 94 min |
| Aug 9, 11:28 PM EDT | River Flood Warning | CTP | 37 hr |
| Aug 10, 12:05 AM EDT | River Flood Warning | CTP | 40 hr |
| Aug 10, 12:14 AM EDT | River Flood Warning | CTP | 37 hr |
| Aug 17, 4:59 AM EDT | Flood Watch | CTP | 42 hr |
| Aug 18, 1:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 18, 1:42 PM EDT | Special Weather Statement | CTP | 33 min |
| Aug 18, 4:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Aug 28, 6:19 PM EDT | Special Weather Statement | CTP | 41 min |
| Aug 29, 2:34 PM EDT | Flood Watch | CTP | 9 hr |
| Aug 29, 5:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 29, 6:00 PM EDT | Special Weather Statement | CTP | 30 min |
| Aug 29, 6:21 PM EDT | Areal Flood Advisory | CTP | 84 min |
| Aug 29, 7:39 PM EDT | Severe Thunderstorm Warning | CTP | 51 min |
| Aug 29, 8:28 PM EDT | Severe Thunderstorm Warning | CTP | 47 min |
| Sep 4, 7:07 AM EDT | Special Weather Statement | CTP | 83 min |
| Sep 5, 4:46 AM EDT | Special Weather Statement | CTP | 4 hr |
| Sep 21, 2:37 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 10:21 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| Sep 21, 10:44 PM EDT | Flash Flood Warning | CTP | 2 hr |
| Sep 21, 11:11 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| Oct 2, 10:27 PM EDT | Dense Fog Advisory | CTP | 12 hr |
| Oct 10, 3:04 AM EDT | Frost Advisory | CTP | 30 hr |
| Oct 13, 9:27 PM EDT | Special Weather Statement | CTP | 18 min |
| Oct 14, 2:34 PM EDT | Frost Advisory | CTP | 18 hr |
| Oct 15, 12:36 PM EDT | Frost Advisory | CTP | 20 hr |
| Oct 16, 1:44 PM EDT | Freeze Warning | CTP | 19 hr |
| Nov 1, 4:09 AM EDT | Fire Weather Watch | CTP | 6 hr |
| Nov 1, 9:53 AM EDT | Red Flag Warning | CTP | 9 hr |
| Nov 7, 1:57 PM EST | Fire Weather Watch | CTP | 18 hr |
| Nov 7, 1:57 PM EST | Red Flag Warning | CTP | 28 hr |
| Nov 20, 11:39 AM EST | Winter Weather Advisory | CTP | 52 hr |
| Dec 3, 2:37 PM EST | Wind Advisory | CTP | 52 hr |
| Dec 3, 3:38 PM EST | Special Weather Statement | CTP | 67 min |
| Dec 5, 4:49 AM EST | Snow Squall Warning | CTP | 56 min |
| Dec 5, 5:48 AM EST | Special Weather Statement | CTP | 72 min |
| Dec 5, 6:23 AM EST | Special Weather Statement | CTP | 52 min |
| Dec 9, 9:44 PM EST | Dense Fog Advisory | CTP | 11 hr |
| Dec 12, 4:17 AM EST | Special Weather Statement | CTP | 58 min |
| Dec 14, 3:30 AM EST | Winter Weather Advisory | CTP | 55 hr |
| Dec 28, 5:40 PM EST | Dense Fog Advisory | CTP | 15 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 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 31 |
| Special Weather Statement | 18 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| River Flood Warning | 6 |
| Flood Watch | 7 |
| Areal Flood Advisory | 7 |
| Winter | |
| Snow Squall Warning | 6 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Frost Advisory | 6 |
| Wind and dust | |
| Wind Advisory | 8 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20232025
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.