Alert archive / Pennsylvania / Blair County
Weather alerts in Blair County, Pennsylvania, 2009
128 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 128
- Warnings
- 15
- Watches
- 18
- Advisories
- 42
- Busiest month
- December21 alerts
- Busiest day
- May 28, 20095 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, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 6 | 5 | 17% | 1 | 100% | 14 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 183 min |
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 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 10, 6:33 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 14, 4:25 AM EST | Winter Weather Advisory | CTP | 38 hr |
| Jan 15, 3:30 AM EST | Wind Chill Advisory | CTP | 56 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 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, 8:00 PM EST | Mesoscale Discussion | SPC | 60 min |
| Feb 11, 8:41 PM EST | Severe Thunderstorm Warning | CTP | 64 min |
| Feb 14, 9:29 AM EST | Winter Weather Advisory | CTP | 9 hr |
| Feb 17, 2:45 PM EST | Winter Weather Advisory | CTP | 34 hr |
| Feb 18, 12:38 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Feb 19, 4:16 AM EST | Wind 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 |
| Apr 3, 3:04 AM EDT | High Wind Watch | CTP | 9 hr |
| Apr 3, 10:42 AM EDT | Special Weather Statement | CTP | 48 min |
| Apr 3, 11:47 AM EDT | Wind Advisory | CTP | 28 hr |
| Apr 28, 10:43 AM EDT | Red Flag Warning | CTP | 9 hr |
| May 4, 12:36 PM EDT | Areal Flood Advisory | CTP | 4 hr |
| May 5, 3:11 PM EDT | Flood Watch | CTP | 36 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 23, 2:12 PM EDT | Severe Thunderstorm Warning | CTP | 33 min |
| May 23, 3:21 PM EDT | Special Weather Statement | CTP | 39 min |
| May 28, 2:54 PM EDT | Special Weather Statement | CTP | 81 min |
| May 28, 3:52 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 28, 6:34 PM EDT | Severe Thunderstorm Warning | CTP | 41 min |
| May 28, 6:51 PM EDT | Special Weather Statement | CTP | 69 min |
| May 28, 7:58 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 28, 11:02 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 9, 11:48 AM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 9, 1:31 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 10, 4:46 PM EDT | Special Weather Statement | CTP | 29 min |
| Jun 10, 5:19 PM EDT | Special Weather Statement | CTP | 26 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, 8:30 PM EDT | Areal Flood Advisory | CTP | 4 hr |
| Jun 17, 9:44 PM EDT | Areal Flood Advisory | CTP | 4 hr |
| Jun 19, 1:14 PM EDT | Flash Flood Watch | CTP | 20 hr |
| Jun 20, 2:52 AM EDT | Special Weather Statement | CTP | 113 min |
| Jun 20, 5:20 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 20, 5:57 AM EDT | Flash Flood Warning | CTP | 4 hr |
| Jun 20, 6:06 AM EDT | Special Weather Statement | CTP | 39 min |
| Jun 20, 8:28 PM EDT | Special Weather Statement | CTP | 32 min |
| Jun 20, 8:59 PM EDT | Special Weather Statement | CTP | 46 min |
| Jun 26, 12:10 AM EDT | Special Weather Statement | CTP | 65 min |
| Jun 26, 12:40 AM EDT | Special Weather Statement | CTP | 50 min |
| Jun 26, 2:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 11, 10:31 AM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 11, 12:09 PM EDT | Special Weather Statement | CTP | 36 min |
| Jul 11, 1:47 PM EDT | Special Weather Statement | CTP | 43 min |
| Jul 11, 6:07 PM EDT | Severe Thunderstorm Warning | CTP | 42 min |
| Jul 11, 6:42 PM EDT | Severe Thunderstorm Warning | CTP | 63 min |
| Jul 17, 9:02 PM EDT | Special Weather Statement | CTP | 28 min |
| Jul 21, 1:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 21, 7:55 PM EDT | Special Weather Statement | CTP | 65 min |
| Jul 21, 8:29 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 21, 9:02 PM EDT | Special Weather Statement | CTP | 58 min |
| Jul 24, 2:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| 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, 7:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Aug 1, 4:05 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| Aug 9, 2:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Aug 9, 3:18 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 5:09 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 6:01 PM EDT | Severe Thunderstorm Warning | CTP | 44 min |
| Aug 10, 8:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 12:36 PM EDT | Mesoscale Discussion | SPC | 84 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 18, 2:22 PM EDT | Special Weather Statement | CTP | 38 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, 10:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 27, 2:18 PM EDT | Wind Advisory | CTP | 29 hr |
| Sep 28, 8:12 AM EDT | Special Weather Statement | CTP | 63 min |
| Sep 28, 8:45 AM EDT | Special Weather Statement | CTP | 60 min |
| Sep 28, 9:56 AM EDT | Special Weather Statement | CTP | 64 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 7, 12:16 PM EDT | High Wind Warning | CTP | 5 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 |
| Nov 26, 3:07 AM EST | Dense Fog Advisory | CTP | 6 hr |
| Dec 3, 2:37 AM EST | Special Weather Statement | CTP | 38 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, 6:12 AM EST | Winter Weather Advisory | CTP | 26 hr |
| Dec 9, 3:38 AM EST | Wind Advisory | CTP | 26 hr |
| Dec 9, 4:05 PM EST | Special Weather Statement | CTP | 40 min |
| Dec 12, 3:17 PM EST | Freezing Rain Advisory | CTP | 25 hr |
| Dec 13, 5:16 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 15, 8:35 PM EST | Special Weather Statement | CTP | 55 min |
| Dec 15, 9:47 PM EST | Special Weather Statement | CTP | 43 min |
| 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 25, 7:50 AM EST | Mesoscale Discussion | SPC | 4 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, 2:33 PM EST | Wind Advisory | CTP | 28 hr |
| Dec 29, 6:33 AM EST | Special Weather Statement | CTP | 57 min |
| Dec 30, 2:45 PM EST | Winter Weather Advisory | CTP | 19 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 | 6 |
| Severe Thunderstorm Watch | 7 |
| Mesoscale Discussion | 25 |
| Special Weather Statement | 28 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 2 |
| Flood Watch | 1 |
| Areal Flood Advisory | 9 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 6 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 12 |
| Cold | |
| Frost Advisory | 4 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 2 |
| Wind Advisory | 9 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
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.