Alert archive / Pennsylvania / Union County
Weather alerts in Union County, Pennsylvania, 2009
119 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 119
- Warnings
- 20
- Watches
- 17
- Advisories
- 37
- Busiest month
- July24 alerts
- Busiest day
- August 9, 20096 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 Union County in 2009 had a tornado report inside them.
Union County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 0 | ||
| Severe thunderstorm warnings | 10 | 8 | 20% | 0 | ||
| Flash flood warnings | 3 | 3 | 0% | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 13 | 3 | 77% | 5 | 80% | 22 min |
| NWS State College, PA: severe thunderstorm warnings | 166 | 86 | 48% | 182 | 80% | 26 min |
| NWS State College, PA: flash flood warnings | 38 | 23 | 39% | 43 | 93% | 64 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 5, 3:10 AM EST | Winter Storm Watch | CTP | 19 hr |
| Jan 5, 10:11 PM EST | Ice Storm Warning | CTP | 39 hr |
| Jan 6, 5:17 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 7, 12:10 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 8, 3:30 PM EST | Winter Storm Watch | CTP | 23 hr |
| Jan 9, 2:32 PM EST | Winter Storm Warning | CTP | 30 hr |
| Jan 9, 2:32 PM EST | Winter Weather Advisory | CTP | 37 hr |
| Jan 14, 4:25 AM EST | Winter Weather Advisory | CTP | 38 hr |
| Jan 26, 3:30 AM EST | Winter Storm Watch | CTP | 32 hr |
| Jan 27, 11:40 AM EST | Winter Storm Warning | CTP | 31 hr |
| Jan 28, 12:31 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 28, 7:53 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 11, 3:09 PM EST | Wind Advisory | CTP | 32 hr |
| Feb 11, 8:00 PM EST | Mesoscale Discussion | SPC | 60 min |
| Feb 11, 8:19 PM EST | Severe Thunderstorm Watch | SPC | 3 hr |
| Feb 11, 8:41 PM EST | Severe Thunderstorm Warning | CTP | 64 min |
| Feb 17, 2:45 PM EST | Winter Weather Advisory | CTP | 34 hr |
| Feb 18, 12:38 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Mar 8, 3:29 PM EDT | Wind Advisory | CTP | 24 hr |
| Mar 10, 3:48 PM EDT | Wind Advisory | CTP | 28 hr |
| Mar 23, 4:48 AM EDT | Red Flag Warning | CTP | 15 hr |
| Mar 27, 3:55 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Apr 3, 3:04 AM EDT | High Wind Watch | CTP | 9 hr |
| Apr 3, 11:47 AM EDT | Wind Advisory | CTP | 28 hr |
| Apr 28, 10:43 AM EDT | Red Flag Warning | CTP | 9 hr |
| May 15, 2:39 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| May 16, 12:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| May 16, 1:00 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 16, 3:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| May 16, 6:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 17, 3:20 AM EDT | Frost Advisory | CTP | 30 hr |
| May 18, 3:28 PM EDT | Frost Advisory | CTP | 17 hr |
| May 23, 12:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 24, 3:43 PM EDT | Special Weather Statement | CTP | 62 min |
| May 28, 8:02 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 29, 1:58 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 2, 2:54 AM EDT | Special Weather Statement | CTP | 66 min |
| Jun 2, 3:38 AM EDT | Special Weather Statement | CTP | 67 min |
| Jun 9, 11:48 AM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 9, 1:31 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 3:40 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jun 11, 4:04 AM EDT | Flash Flood Watch | CTP | 23 hr |
| Jun 20, 7:15 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 26, 2:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 26, 2:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 26, 5:34 PM EDT | Special Weather Statement | CTP | 26 min |
| Jun 26, 6:01 PM EDT | Special Weather Statement | CTP | 44 min |
| Jun 30, 10:06 AM EDT | Special Weather Statement | CTP | 54 min |
| Jul 3, 2:02 PM EDT | Special Weather Statement | CTP | 88 min |
| Jul 11, 10:31 AM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 11, 4:58 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Jul 11, 5:28 PM EDT | Tornado Warning | CTP | 32 min |
| Jul 11, 7:06 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 11, 7:19 PM EDT | Severe Thunderstorm Warning | CTP | 71 min |
| Jul 11, 8:28 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Jul 11, 9:54 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 11, 10:33 PM EDT | Flash Flood Warning | CTP | 4 hr |
| Jul 21, 1:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 23, 1:57 AM EDT | Special Weather Statement | CTP | 63 min |
| Jul 23, 6:06 PM EDT | Special Weather Statement | CTP | 54 min |
| Jul 23, 6:36 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Jul 24, 2:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 24, 6:44 PM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| Jul 25, 6:36 AM EDT | Dense Fog Advisory | CTP | 3 hr |
| Jul 25, 3:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 25, 3:50 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 25, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Jul 25, 7:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 26, 3:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 7:59 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 31, 10:03 AM EDT | Flash Flood Warning | CTP | 6 hr |
| Jul 31, 10:20 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Aug 1, 4:05 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| Aug 2, 2:29 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 2, 5:08 AM EDT | Flash Flood Watch | CTP | 10 hr |
| Aug 9, 2:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Aug 9, 3:09 PM EDT | Heat Advisory | CTP | 28 hr |
| Aug 9, 3:18 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 9, 3:47 PM EDT | Severe Thunderstorm Warning | CTP | 43 min |
| Aug 9, 4:25 PM EDT | Severe Thunderstorm Warning | CTP | 65 min |
| Aug 9, 7:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 9, 10:44 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 9, 10:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Aug 10, 5:09 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 8:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 6:37 PM EDT | Special Weather Statement | CTP | 53 min |
| Aug 12, 12:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 12, 5:46 PM EDT | Special Weather Statement | CTP | 29 min |
| Aug 14, 4:04 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Aug 15, 6:30 AM EDT | Dense Fog Advisory | CTP | 4 hr |
| Aug 18, 2:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Aug 18, 4:50 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Aug 19, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 19, 3:47 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Sep 28, 9:56 AM EDT | Special Weather Statement | CTP | 64 min |
| Sep 28, 11:05 AM EDT | Special Weather Statement | CTP | 40 min |
| Oct 6, 2:59 PM EDT | Wind Advisory | CTP | 29 hr |
| Oct 7, 5:39 AM EDT | Special Weather Statement | CTP | 51 min |
| Oct 10, 2:45 PM EDT | Freeze Watch | CTP | 24 hr |
| Oct 11, 2:51 PM EDT | Frost Advisory | CTP | 17 hr |
| Oct 13, 3:28 AM EDT | Frost Advisory | CTP | 30 hr |
| Oct 14, 3:35 PM EDT | Winter Storm Watch | CTP | 13 hr |
| Oct 15, 4:26 AM EDT | Winter Weather Advisory | CTP | 65 hr |
| Oct 24, 10:13 AM EDT | Areal Flood Advisory | CTP | 2 hr |
| Nov 26, 3:07 AM EST | Dense Fog Advisory | CTP | 6 hr |
| Dec 3, 3:31 AM EST | Severe Thunderstorm Warning | CTP | 29 min |
| Dec 3, 3:58 AM EST | Special Weather Statement | CTP | 47 min |
| Dec 5, 4:27 AM EST | Winter Weather Advisory | CTP | 14 hr |
| Dec 8, 6:12 AM EST | Winter Weather Advisory | CTP | 26 hr |
| Dec 8, 11:32 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 9, 3:38 AM EST | Wind Advisory | CTP | 26 hr |
| Dec 12, 3:17 PM EST | Freezing Rain Advisory | CTP | 25 hr |
| Dec 13, 5:16 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 17, 10:08 PM EST | Winter Storm Watch | CTP | 17 hr |
| Dec 18, 2:38 PM EST | Winter Storm Warning | CTP | 32 hr |
| Dec 18, 2:38 PM EST | Winter Weather Advisory | CTP | 32 hr |
| Dec 24, 2:05 PM EST | Winter Weather Advisory | CTP | 29 hr |
| Dec 28, 2:33 PM EST | Wind Advisory | CTP | 28 hr |
| Dec 31, 6:40 PM EST | Winter Weather Advisory | CTP | 6 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 | 10 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 8 |
| Mesoscale Discussion | 30 |
| Special Weather Statement | 15 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 2 |
| Areal Flood Advisory | 8 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 5 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind and dust | |
| High Wind Watch | 1 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.