Alert archive / Pennsylvania / Somerset County
Weather alerts in Somerset County, Pennsylvania, 2009
151 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Somerset County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 151
- Warnings
- 21
- Watches
- 21
- Advisories
- 56
- Busiest month
- June34 alerts
- Busiest day
- June 18, 200911 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Somerset County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 2 | 67% | 4 | 100% | 31 min |
| Flash flood warnings | 3 | 0 | 100% | 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 5, 10:11 PM EST | Winter Weather Advisory | CTP | 72 hr |
| Jan 6, 5:17 PM 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 11, 8:09 PM EST | Winter Weather Advisory | CTP | 11 hr |
| Jan 14, 4:25 AM EST | Winter Weather Advisory | CTP | 38 hr |
| Jan 14, 9:45 PM EST | Winter Storm Warning | CTP | 9 hr |
| Jan 15, 3:30 AM EST | Wind Chill Warning | CTP | 32 hr |
| Jan 15, 3:30 AM EST | Wind Chill Advisory | CTP | 56 hr |
| Jan 17, 2:44 PM EST | Winter Weather Advisory | CTP | 31 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 |
| Feb 3, 8:40 PM EST | Winter Weather Advisory | CTP | 28 hr |
| Feb 4, 3:03 PM EST | Wind Chill Advisory | CTP | 18 hr |
| Feb 10, 3:31 PM EST | High Wind Watch | CTP | 24 hr |
| Feb 11, 3:09 PM EST | High Wind Warning | CTP | 28 hr |
| Feb 11, 3:09 PM EST | Wind Advisory | CTP | 32 hr |
| Feb 11, 5:32 PM EST | Mesoscale Discussion | SPC | 88 min |
| Feb 11, 5:53 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Feb 11, 7:46 PM EST | Severe Thunderstorm Warning | CTP | 74 min |
| Feb 11, 8:00 PM EST | Mesoscale Discussion | SPC | 60 min |
| Feb 17, 2:45 PM EST | Winter Weather Advisory | CTP | 34 hr |
| Feb 19, 4:22 AM EST | Winter Weather Advisory | CTP | 31 hr |
| Feb 21, 7:32 PM EST | Winter Weather Advisory | CTP | 43 hr |
| Mar 2, 2:38 PM EST | Wind Chill Advisory | CTP | 18 hr |
| Mar 8, 3:29 PM EDT | Wind Advisory | CTP | 24 hr |
| Mar 10, 3:48 PM EDT | Wind Advisory | CTP | 28 hr |
| Mar 25, 7:08 AM EDT | Red Flag Warning | CTP | 9 hr |
| Mar 27, 3:55 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Mar 29, 2:15 PM EDT | Wind Advisory | CTP | 20 hr |
| Apr 3, 3:04 AM EDT | High Wind Watch | CTP | 9 hr |
| Apr 3, 9:29 AM EDT | Special Weather Statement | CTP | 61 min |
| Apr 3, 11:47 AM EDT | Wind Advisory | CTP | 28 hr |
| Apr 6, 2:56 PM EDT | Winter Weather Advisory | CTP | 37 hr |
| Apr 24, 8:43 AM EDT | Special Weather Statement | CTP | 47 min |
| May 4, 11:32 AM EDT | Areal Flood Advisory | CTP | 6 hr |
| May 4, 7:07 PM EDT | Areal Flood Advisory | CTP | 4 hr |
| May 5, 3:11 PM EDT | Flood Watch | CTP | 36 hr |
| May 9, 3:38 AM EDT | Wind Advisory | CTP | 23 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, 9:50 PM EDT | Freeze Watch | CTP | 6 hr |
| May 17, 3:20 AM EDT | Freeze Warning | 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, 3:54 PM EDT | Flash Flood Warning | CTP | 3 hr |
| May 24, 6:21 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 25, 6:03 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 25, 8:54 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 28, 3:52 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 28, 4:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| May 28, 7:58 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 28, 8:41 PM EDT | Special Weather Statement | CTP | 49 min |
| May 28, 9:14 PM EDT | Special Weather Statement | CTP | 31 min |
| Jun 2, 10:13 PM EDT | Special Weather Statement | CTP | 32 min |
| Jun 2, 10:39 PM EDT | Special Weather Statement | CTP | 36 min |
| Jun 2, 10:43 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Jun 9, 11:47 AM EDT | Special Weather Statement | CTP | 43 min |
| Jun 9, 11:48 AM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 9, 12:32 PM EDT | Special Weather Statement | CTP | 43 min |
| Jun 9, 1:03 PM EDT | Severe Thunderstorm Warning | CTP | 42 min |
| Jun 9, 1:49 PM EDT | Severe Thunderstorm Warning | CTP | 56 min |
| Jun 9, 3:23 PM EDT | Special Weather Statement | CTP | 37 min |
| Jun 9, 3:28 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Jun 11, 4:04 AM EDT | Flash Flood Watch | CTP | 23 hr |
| Jun 11, 10:21 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 17, 8:27 PM EDT | Special Weather Statement | CTP | 63 min |
| Jun 17, 8:30 PM EDT | Areal Flood Advisory | CTP | 4 hr |
| Jun 17, 9:01 PM EDT | Flash Flood Warning | CTP | 4 hr |
| Jun 17, 9:31 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 17, 10:01 PM EDT | Special Weather Statement | CTP | 44 min |
| Jun 17, 10:25 PM EDT | Special Weather Statement | CTP | 50 min |
| Jun 17, 11:19 PM EDT | Special Weather Statement | CTP | 26 min |
| Jun 17, 11:52 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 18, 12:56 AM EDT | Areal Flood Advisory | CTP | 109 min |
| Jun 18, 4:03 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 18, 6:48 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 19, 1:14 PM EDT | Flash Flood Watch | CTP | 20 hr |
| Jun 19, 6:28 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 20, 1:50 AM EDT | Special Weather Statement | CTP | 85 min |
| Jun 20, 2:32 AM EDT | Special Weather Statement | CTP | 73 min |
| Jun 20, 3:14 AM EDT | Mesoscale Discussion | SPC | 91 min |
| Jun 20, 5:40 AM EDT | Special Weather Statement | CTP | 65 min |
| Jun 20, 6:59 PM EDT | Special Weather Statement | CTP | 46 min |
| Jun 20, 7:46 PM EDT | Special Weather Statement | CTP | 44 min |
| Jun 20, 9:51 PM EDT | Special Weather Statement | CTP | 54 min |
| Jun 20, 10:43 PM EDT | Special Weather Statement | CTP | 47 min |
| Jun 20, 11:27 PM EDT | Special Weather Statement | CTP | 48 min |
| Jul 1, 2:31 PM EDT | Special Weather Statement | CTP | 44 min |
| Jul 20, 5:28 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 21, 10:44 AM EDT | Flash Flood Watch | CTP | 15 hr |
| Jul 21, 1:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 21, 5:37 PM EDT | Special Weather Statement | CTP | 23 min |
| Jul 21, 5:57 PM EDT | Special Weather Statement | CTP | 33 min |
| Jul 21, 6:33 PM EDT | Special Weather Statement | CTP | 42 min |
| Jul 25, 3:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 25, 3:50 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 1, 4:05 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| Aug 9, 3:18 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 3:46 PM EDT | Special Weather Statement | CTP | 29 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 12, 12:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 12, 1:16 PM EDT | Special Weather Statement | CTP | 44 min |
| Aug 13, 4:15 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| Aug 14, 4:04 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Aug 16, 7:09 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Aug 16, 7:49 PM EDT | Special Weather Statement | CTP | 26 min |
| Aug 18, 2:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Aug 19, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 20, 6:54 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 20, 10:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 27, 2:18 PM EDT | Wind Advisory | CTP | 29 hr |
| Sep 28, 8:45 AM EDT | Special Weather Statement | CTP | 60 min |
| Sep 30, 2:11 PM EDT | Frost Advisory | CTP | 14 hr |
| Oct 6, 2:59 PM EDT | Wind Advisory | CTP | 29 hr |
| Oct 7, 12:16 PM EDT | High Wind Warning | CTP | 5 hr |
| Oct 9, 6:35 PM EDT | Special Weather Statement | CTP | 40 min |
| Oct 11, 2:51 PM EDT | Frost Advisory | CTP | 17 hr |
| Oct 13, 3:28 AM EDT | Freeze Warning | 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, 5:25 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Nov 26, 3:07 AM EST | Dense Fog Advisory | CTP | 6 hr |
| Nov 27, 9:52 AM EST | Special Weather Statement | CTP | 2 hr |
| Dec 2, 9:09 PM EST | Wind Advisory | CTP | 13 hr |
| Dec 3, 1:46 AM EST | Special Weather Statement | CTP | 59 min |
| Dec 5, 4:27 AM EST | Winter Weather Advisory | CTP | 14 hr |
| Dec 7, 2:41 PM EST | Winter Storm Watch | CTP | 21 hr |
| Dec 8, 11:13 AM EST | Winter Storm Warning | CTP | 21 hr |
| Dec 8, 1:57 PM EST | High Wind Watch | CTP | 14 hr |
| Dec 9, 3:38 AM EST | Wind Advisory | CTP | 26 hr |
| Dec 9, 1:49 PM EST | Severe Thunderstorm Warning | CTP | 41 min |
| Dec 10, 9:49 PM EST | Wind Chill Advisory | CTP | 10 hr |
| Dec 12, 3:17 PM EST | Freezing Rain Advisory | CTP | 25 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 24, 2:05 PM EST | Winter Weather Advisory | CTP | 29 hr |
| Dec 25, 7:50 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 25, 2:57 PM EST | Wind Advisory | CTP | 8 hr |
| Dec 26, 10:58 PM EST | Special Weather Statement | CTP | 4 hr |
| Dec 27, 3:58 PM EST | Winter Weather Advisory | CTP | 14 hr |
| Dec 28, 11:53 AM EST | Winter Weather Advisory | CTP | 24 hr |
| Dec 28, 2:33 PM EST | Wind Advisory | CTP | 28 hr |
| Dec 30, 2:45 PM EST | Winter Weather Advisory | CTP | 19 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 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.