Alert archive / Pennsylvania / Blair County
Weather alerts in Blair County, Pennsylvania, 2011
196 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Blair County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 196
- Warnings
- 48
- Watches
- 32
- Advisories
- 45
- Busiest month
- April41 alerts
- Busiest day
- April 26, 20119 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Blair County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 26 | 16 | 38% | 8 | 88% | 24 min |
| Flash flood warnings | 7 | 6 | 14% | 4 | 100% | 105 min |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 40 | 7 | 83% | 23 | 35% | 22 min |
| NWS State College, PA: severe thunderstorm warnings | 243 | 127 | 48% | 332 | 83% | 28 min |
| NWS State College, PA: flash flood warnings | 79 | 46 | 42% | 114 | 76% | 101 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 7, 7:26 AM EST | Special Weather Statement | CTP | 64 min |
| Jan 7, 2:33 PM EST | Winter Weather Advisory | CTP | 37 hr |
| Jan 10, 3:14 PM EST | Winter Weather Advisory | CTP | 3 days |
| Jan 15, 10:50 PM EST | Special Weather Statement | CTP | 85 min |
| Jan 17, 6:03 AM EST | Winter Weather Advisory | CTP | 33 hr |
| Jan 18, 8:34 PM EST | Winter Weather Advisory | CTP | 11 hr |
| Jan 20, 4:13 AM EST | Winter Weather Advisory | CTP | 40 hr |
| Jan 25, 2:24 PM EST | Winter Weather Advisory | CTP | 33 hr |
| Jan 26, 7:30 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 26, 4:55 PM EST | Special Weather Statement | CTP | 80 min |
| Jan 30, 12:16 AM EST | Special Weather Statement | CTP | 119 min |
| Jan 30, 7:18 PM EST | Winter Storm Watch | CTP | 20 hr |
| Jan 31, 3:07 PM EST | Winter Storm Warning | CTP | 40 hr |
| Feb 1, 2:42 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 1, 8:39 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 2, 3:43 AM EST | Wind Advisory | CTP | 18 hr |
| Feb 4, 2:47 PM EST | Winter Weather Advisory | CTP | 32 hr |
| Feb 8, 4:24 AM EST | Wind Advisory | CTP | 15 hr |
| Feb 13, 3:14 PM EST | Wind Advisory | CTP | 30 hr |
| Feb 18, 11:00 AM EST | High Wind Watch | CTP | 10 hr |
| Feb 18, 9:18 PM EST | High Wind Warning | CTP | 24 hr |
| Feb 20, 4:29 AM EST | Winter Weather Advisory | CTP | 30 hr |
| Feb 20, 7:46 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 21, 5:06 AM EST | Winter Storm Watch | CTP | 8 hr |
| Feb 21, 1:22 PM EST | Winter Storm Warning | CTP | 17 hr |
| Feb 21, 5:58 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 24, 3:00 AM EST | Flood Watch | CTP | 30 hr |
| Feb 24, 10:06 PM EST | Wind Advisory | CTP | 20 hr |
| Feb 27, 1:59 PM EST | Flood Watch | CTP | 22 hr |
| Feb 28, 6:26 AM EST | Special Weather Statement | CTP | 19 min |
| Feb 28, 8:04 AM EST | Areal Flood Advisory | CTP | 6 hr |
| Mar 4, 3:33 AM EST | Flood Watch | CTP | 3 days |
| Mar 5, 10:50 PM EST | Winter Weather Advisory | CTP | 32 hr |
| Mar 6, 2:50 PM EST | Areal Flood Advisory | CTP | 4 hr |
| Mar 6, 3:06 PM EST | Areal Flood Advisory | CTP | 4 hr |
| Mar 6, 8:00 PM EST | Areal Flood Advisory | CTP | 6 hr |
| Mar 8, 4:25 AM EST | Flood Watch | CTP | 66 hr |
| Mar 8, 2:18 PM EST | Winter Weather Advisory | CTP | 38 hr |
| Mar 10, 4:45 AM EST | River Flood Warning | CTP | 38 hr |
| Mar 10, 4:31 PM EST | Areal Flood Warning | CTP | 10 hr |
| Mar 10, 4:46 PM EST | Special Weather Statement | CTP | 44 min |
| Mar 10, 5:20 PM EST | Special Weather Statement | CTP | 25 min |
| Mar 11, 12:22 AM EST | River Flood Warning | CTP | 10 hr |
| Mar 11, 2:26 AM EST | Areal Flood Warning | CTP | 8 hr |
| Mar 21, 4:27 AM EDT | Special Weather Statement | CTP | 63 min |
| Mar 23, 3:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Mar 23, 4:13 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 23, 5:01 PM EDT | Special Weather Statement | CTP | 29 min |
| Mar 23, 6:04 PM EDT | Severe Thunderstorm Warning | CTP | 26 min |
| Mar 23, 6:31 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Apr 4, 6:55 PM EDT | Severe Thunderstorm Warning | CTP | 35 min |
| Apr 11, 2:11 PM EDT | Special Weather Statement | CTP | 34 min |
| Apr 12, 10:16 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Apr 13, 11:48 AM EDT | Areal Flood Advisory | CTP | 4 hr |
| Apr 15, 12:54 PM EDT | Flash Flood Watch | CTP | 33 hr |
| Apr 15, 1:56 PM EDT | Wind Advisory | CTP | 32 hr |
| Apr 16, 2:52 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Apr 16, 4:41 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 16, 9:40 PM EDT | Wind Advisory | CTP | 22 hr |
| Apr 16, 10:02 PM EDT | River Flood Warning | CTP | 12 hr |
| Apr 16, 10:02 PM EDT | River Flood Warning | CTP | 3 hr |
| Apr 17, 11:29 PM EDT | Special Weather Statement | CTP | 3 hr |
| Apr 19, 8:39 PM EDT | Special Weather Statement | CTP | 66 min |
| Apr 19, 9:05 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Apr 20, 3:45 PM EDT | Mesoscale Discussion | SPC | 30 min |
| Apr 20, 4:03 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 22, 2:51 PM EDT | Flash Flood Watch | CTP | 30 hr |
| Apr 25, 1:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 25, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 25, 6:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Apr 26, 1:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Apr 26, 1:49 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 26, 3:21 PM EDT | Severe Thunderstorm Warning | CTP | 54 min |
| Apr 26, 4:10 PM EDT | Severe Thunderstorm Warning | CTP | 65 min |
| Apr 26, 4:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 26, 5:03 PM EDT | Severe Thunderstorm Warning | CTP | 57 min |
| Apr 26, 6:21 PM EDT | Special Weather Statement | CTP | 39 min |
| Apr 26, 6:51 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Apr 26, 6:58 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Apr 26, 8:27 PM EDT | Special Weather Statement | CTP | 48 min |
| Apr 27, 11:16 AM EDT | Flash Flood Watch | CTP | 23 hr |
| Apr 27, 1:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 27, 3:10 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 27, 5:43 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Apr 27, 6:45 PM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Apr 27, 6:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Apr 27, 10:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Apr 27, 11:50 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 28, 1:21 AM EDT | Severe Thunderstorm Warning | CTP | 39 min |
| Apr 28, 1:44 AM EDT | Flash Flood Warning | CTP | 4 hr |
| Apr 28, 2:20 AM EDT | Mesoscale Discussion | SPC | 55 min |
| May 3, 3:54 AM EDT | Flash Flood Watch | CTP | 22 hr |
| May 3, 4:42 PM EDT | Flash Flood Warning | CTP | 3 hr |
| May 17, 6:50 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| May 17, 7:23 PM EDT | Special Weather Statement | CTP | 37 min |
| May 17, 7:47 PM EDT | Areal Flood Advisory | CTP | 88 min |
| May 18, 11:55 AM EDT | Mesoscale Discussion | SPC | 65 min |
| May 18, 12:55 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 18, 3:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 23, 10:33 AM EDT | Mesoscale Discussion | SPC | 87 min |
| May 23, 10:48 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 23, 2:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 23, 3:22 PM EDT | Special Weather Statement | CTP | 23 min |
| May 24, 1:13 AM EDT | Special Weather Statement | CTP | 92 min |
| May 24, 10:49 PM EDT | Areal Flood Advisory | CTP | 116 min |
| May 25, 12:45 AM EDT | Areal Flood Advisory | CTP | 2 hr |
| May 26, 2:53 PM EDT | Tornado Watch | SPC | 7 hr |
| May 26, 5:35 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| May 26, 5:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 26, 6:28 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| May 26, 10:59 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 27, 12:57 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 27, 3:51 PM EDT | Severe Thunderstorm Warning | CTP | 54 min |
| May 27, 4:46 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| May 27, 5:07 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Jun 1, 10:02 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 1, 1:18 PM EDT | Special Weather Statement | CTP | 57 min |
| Jun 4, 2:49 PM EDT | Special Weather Statement | CTP | 26 min |
| Jun 9, 10:36 AM EDT | Mesoscale Discussion | SPC | 84 min |
| Jun 9, 11:33 AM EDT | Mesoscale Discussion | SPC | 57 min |
| Jun 9, 12:53 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 9, 2:55 PM EDT | Severe Thunderstorm Warning | CTP | 2 hr |
| Jun 9, 4:12 PM EDT | Special Weather Statement | CTP | 33 min |
| Jun 9, 6:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 10, 3:35 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Jun 10, 4:23 PM EDT | Severe Thunderstorm Warning | CTP | 82 min |
| Jun 10, 5:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 11, 3:51 PM EDT | Special Weather Statement | CTP | 54 min |
| Jun 16, 6:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 16, 7:32 PM EDT | Special Weather Statement | CTP | 73 min |
| Jun 20, 11:43 PM EDT | Special Weather Statement | CTP | 62 min |
| Jun 23, 3:27 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 1:19 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 7, 3:12 PM EDT | Special Weather Statement | CTP | 33 min |
| Jul 8, 11:44 AM EDT | Mesoscale Discussion | SPC | 61 min |
| Jul 11, 5:47 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 11, 5:52 PM EDT | Severe Thunderstorm Warning | CTP | 53 min |
| Jul 11, 5:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 11, 6:48 PM EDT | Severe Thunderstorm Warning | CTP | 57 min |
| Jul 20, 1:43 PM EDT | Heat Advisory | CTP | 30 hr |
| Jul 20, 1:43 PM EDT | Heat Advisory | CTP | 54 hr |
| Jul 22, 4:08 AM EDT | Heat Advisory | CTP | 40 hr |
| Jul 22, 5:37 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 22, 8:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 25, 4:16 PM EDT | Special Weather Statement | CTP | 44 min |
| Jul 25, 5:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jul 29, 2:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 29, 2:40 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 29, 3:52 PM EDT | Special Weather Statement | CTP | 23 min |
| Jul 29, 4:04 PM EDT | Severe Thunderstorm Warning | CTP | 56 min |
| Jul 29, 4:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 7, 3:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Aug 13, 2:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 14, 6:04 PM EDT | Special Weather Statement | CTP | 26 min |
| Aug 19, 12:15 PM EDT | Special Weather Statement | CTP | 45 min |
| Aug 19, 12:17 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| Aug 19, 12:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Aug 19, 12:53 PM EDT | Severe Thunderstorm Warning | CTP | 52 min |
| Aug 19, 1:12 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 19, 1:54 PM EDT | Severe Thunderstorm Warning | CTP | 66 min |
| Aug 20, 4:15 AM EDT | Dense Fog Advisory | CTP | 7 hr |
| Aug 21, 12:52 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 25, 2:31 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 25, 5:55 AM EDT | Special Weather Statement | CTP | 35 min |
| Sep 4, 1:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Sep 4, 5:23 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Sep 4, 5:55 PM EDT | Special Weather Statement | CTP | 65 min |
| Sep 5, 9:07 PM EDT | Flood Watch | CTP | 71 hr |
| Sep 6, 12:00 PM EDT | River Flood Warning | CTP | 42 hr |
| Sep 6, 12:00 PM EDT | River Flood Warning | CTP | 32 hr |
| Sep 6, 12:06 PM EDT | Areal Flood Warning | CTP | 34 hr |
| Sep 7, 2:53 AM EDT | Areal Flood Advisory | CTP | 6 hr |
| Sep 8, 7:59 PM EDT | Flash Flood Watch | CTP | 8 hr |
| Sep 9, 5:30 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Sep 9, 6:07 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Sep 9, 6:54 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Sep 9, 8:19 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Sep 9, 10:41 PM EDT | River Flood Warning | CTP | 15 hr |
| Sep 9, 10:41 PM EDT | River Flood Warning | CTP | 6 hr |
| Sep 12, 12:29 AM EDT | Dense Fog Advisory | CTP | 10 hr |
| Sep 23, 1:15 AM EDT | Dense Fog Advisory | CTP | 9 hr |
| Sep 23, 9:32 PM EDT | Dense Fog Advisory | CTP | 6 hr |
| Sep 27, 4:37 AM EDT | Severe Thunderstorm Warning | CTP | 53 min |
| Sep 27, 5:32 AM EDT | Special Weather Statement | CTP | 43 min |
| Sep 27, 6:09 AM EDT | Special Weather Statement | CTP | 36 min |
| Sep 27, 6:21 AM EDT | Severe Thunderstorm Warning | CTP | 28 min |
| Sep 27, 9:05 AM EDT | Areal Flood Advisory | CTP | 115 min |
| Sep 27, 9:12 AM EDT | Flash Flood Watch | CTP | 40 hr |
| Sep 28, 4:38 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Oct 6, 1:09 PM EDT | Frost Advisory | CTP | 19 hr |
| Oct 22, 5:22 AM EDT | Frost Advisory | CTP | 28 hr |
| Oct 28, 2:12 AM EDT | Winter Storm Watch | CTP | 11 hr |
| Oct 28, 1:08 PM EDT | Winter Storm Warning | CTP | 33 hr |
| Nov 23, 12:04 AM EST | Areal Flood Advisory | CTP | 6 hr |
| Nov 23, 6:03 AM EST | Areal Flood Advisory | CTP | 117 min |
| Dec 7, 4:51 AM EST | Winter Weather Advisory | CTP | 20 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 | 26 |
| Severe Thunderstorm Watch | 14 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 39 |
| Special Weather Statement | 32 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 7 |
| River Flood Warning | 8 |
| Flash Flood Watch | 6 |
| Flood Watch | 5 |
| Areal Flood Advisory | 19 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 11 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.