Alert archive / Pennsylvania / Blair County
Weather alerts in Blair County, Pennsylvania, 2018
136 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 136
- Warnings
- 27
- Watches
- 17
- Advisories
- 37
- Busiest month
- May27 alerts
- Busiest day
- May 12, 20189 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 Blair County in 2018 had a tornado report inside them.
Blair County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 0 | ||
| Severe thunderstorm warnings | 10 | 9 | 10% | 4 | 50% | 50 min |
| Flash flood warnings | 2 | 1 | 50% | 1 | 100% | 40 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 22 | 5 | 77% | 10 | 50% | 7 min |
| NWS State College, PA: severe thunderstorm warnings | 122 | 81 | 34% | 244 | 80% | 30 min |
| NWS State College, PA: flash flood warnings | 57 | 36 | 37% | 89 | 88% | 96 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, 3:46 AM EST | Wind Chill Advisory | CTP | 3 days |
| Jan 12, 4:46 AM EST | Winter Weather Advisory | CTP | 29 hr |
| Jan 12, 5:34 PM EST | Special Weather Statement | CTP | 26 min |
| Jan 12, 6:05 PM EST | Severe Thunderstorm Warning | CTP | 55 min |
| Jan 12, 7:04 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 15, 2:22 PM EST | Winter Weather Advisory | CTP | 41 hr |
| Feb 3, 2:44 PM EST | Winter Weather Advisory | CTP | 42 hr |
| Feb 5, 2:40 PM EST | Winter Storm Watch | CTP | 24 hr |
| Feb 6, 3:57 AM EST | Winter Weather Advisory | CTP | 38 hr |
| Feb 7, 5:28 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 7, 11:25 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 11, 12:01 AM EST | Dense Fog Advisory | CTP | 10 hr |
| Feb 15, 7:32 PM EST | Areal Flood Advisory | CTP | 3 hr |
| Feb 15, 10:30 PM EST | Areal Flood Advisory | CTP | 3 hr |
| Feb 16, 1:41 AM EST | Areal Flood Advisory | CTP | 5 hr |
| Feb 16, 4:27 AM EST | River Flood Warning | CTP | 22 hr |
| Feb 16, 6:49 AM EST | Areal Flood Advisory | CTP | 3 hr |
| Feb 16, 8:15 AM EST | Areal Flood Advisory | CTP | 3 hr |
| Feb 16, 1:22 PM EST | River Flood Warning | CTP | 12 hr |
| Feb 16, 7:14 PM EST | Winter Weather Advisory | CTP | 33 hr |
| Feb 22, 11:29 AM EST | Flood Watch | CTP | 68 hr |
| Feb 25, 4:28 AM EST | Areal Flood Advisory | CTP | 5 hr |
| Mar 1, 4:03 PM EST | High Wind Warning | CTP | 30 hr |
| Mar 15, 12:26 PM EDT | Special Weather Statement | CTP | 49 min |
| Mar 20, 4:36 AM EDT | Winter Storm Warning | CTP | 39 hr |
| Mar 27, 5:00 AM EDT | Winter Weather Advisory | CTP | 12 hr |
| Mar 29, 2:28 AM EDT | Dense Fog Advisory | CTP | 8 hr |
| Apr 1, 4:17 AM EDT | Winter Weather Advisory | CTP | 29 hr |
| Apr 3, 3:25 PM EDT | Wind Advisory | CTP | 12 hr |
| Apr 3, 6:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 3, 9:10 PM EDT | Special Weather Statement | CTP | 65 min |
| Apr 4, 3:36 AM EDT | High Wind Warning | CTP | 16 hr |
| Apr 16, 1:45 PM EDT | Special Weather Statement | CTP | 45 min |
| Apr 17, 6:02 PM EDT | Special Weather Statement | CTP | 58 min |
| Apr 27, 8:11 PM EDT | Special Weather Statement | CTP | 64 min |
| May 2, 4:45 AM EDT | Red Flag Warning | CTP | 16 hr |
| May 3, 5:28 PM EDT | Special Weather Statement | CTP | 32 min |
| May 4, 6:55 PM EDT | Special Weather Statement | CTP | 80 min |
| May 4, 8:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 7, 1:15 AM EDT | Dense Fog Advisory | CTP | 8 hr |
| May 10, 2:24 PM EDT | Special Weather Statement | CTP | 81 min |
| May 10, 3:13 PM EDT | Special Weather Statement | CTP | 62 min |
| May 12, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 12, 3:17 PM EDT | Special Weather Statement | CTP | 43 min |
| May 12, 3:23 PM EDT | Severe Thunderstorm Warning | CTP | 67 min |
| May 12, 4:19 PM EDT | Severe Thunderstorm Warning | CTP | 56 min |
| May 12, 4:58 PM EDT | Special Weather Statement | CTP | 32 min |
| May 12, 5:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 12, 5:48 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 12, 6:12 PM EDT | Special Weather Statement | CTP | 48 min |
| May 12, 6:33 PM EDT | Special Weather Statement | CTP | 27 min |
| May 14, 11:56 AM EDT | Mesoscale Discussion | SPC | 64 min |
| May 14, 12:29 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 14, 3:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 11:43 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 15, 12:26 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 15, 1:59 PM EDT | Special Weather Statement | CTP | 46 min |
| May 15, 2:11 PM EDT | Severe Thunderstorm Warning | CTP | 49 min |
| May 15, 2:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 2:34 PM EDT | Severe Thunderstorm Warning | CTP | 56 min |
| May 28, 5:59 PM EDT | Special Weather Statement | CTP | 31 min |
| May 28, 6:29 PM EDT | Special Weather Statement | CTP | 31 min |
| Jun 5, 3:05 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 6:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 13, 6:33 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 13, 8:07 PM EDT | Special Weather Statement | CTP | 23 min |
| Jun 13, 8:21 PM EDT | Severe Thunderstorm Warning | CTP | 39 min |
| Jun 13, 8:28 PM EDT | Tornado Warning | CTP | 32 min |
| Jun 13, 8:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 27, 7:37 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 27, 9:33 PM EDT | Special Weather Statement | CTP | 42 min |
| Jun 27, 9:57 PM EDT | Special Weather Statement | CTP | 48 min |
| Jun 29, 2:28 PM EDT | Heat Advisory | CTP | 4 days |
| Jul 2, 1:03 PM EDT | Mesoscale Discussion | SPC | 72 min |
| Jul 2, 1:39 PM EDT | Special Weather Statement | CTP | 81 min |
| Jul 2, 2:48 PM EDT | Severe Thunderstorm Warning | CTP | 57 min |
| Jul 2, 3:13 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| Jul 2, 3:29 PM EDT | Flash Flood Warning | CTP | 2 hr |
| Jul 2, 3:35 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Jul 2, 4:05 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Jul 4, 9:54 AM EDT | Flash Flood Watch | CTP | 10 hr |
| Jul 5, 4:17 AM EDT | Flash Flood Watch | CTP | 30 hr |
| Jul 5, 1:37 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 23, 3:59 AM EDT | Flash Flood Watch | CTP | 4 days |
| Jul 30, 4:10 PM EDT | Areal Flood Advisory | CTP | 110 min |
| Aug 1, 4:06 AM EDT | Flash Flood Watch | CTP | 3 days |
| Aug 3, 8:11 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 3, 9:05 AM EDT | Flash Flood Warning | CTP | 3 hr |
| Aug 3, 6:51 PM EDT | River Flood Warning | CTP | 9 hr |
| Aug 4, 2:59 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Aug 13, 1:46 AM EDT | Flash Flood Watch | CTP | 43 hr |
| Aug 14, 4:20 AM EDT | Areal Flood Advisory | CTP | 115 min |
| Aug 21, 2:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 21, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 4:56 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 31, 6:29 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 31, 8:59 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| Sep 6, 1:20 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 7, 2:45 PM EDT | Special Weather Statement | CTP | 30 min |
| Sep 7, 3:14 PM EDT | Special Weather Statement | CTP | 31 min |
| Sep 7, 3:44 PM EDT | Special Weather Statement | CTP | 46 min |
| Sep 8, 3:33 AM EDT | Flood Watch | CTP | 64 hr |
| Sep 9, 7:37 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Sep 9, 9:24 AM EDT | River Flood Warning | CTP | 57 hr |
| Sep 9, 10:28 AM EDT | Areal Flood Warning | CTP | 24 hr |
| Sep 9, 3:51 PM EDT | River Flood Warning | CTP | 48 hr |
| Sep 10, 2:41 AM EDT | Areal Flood Warning | CTP | 9 hr |
| Sep 10, 10:19 AM EDT | Areal Flood Warning | CTP | 9 hr |
| Sep 17, 4:51 AM EDT | Flash Flood Watch | CTP | 31 hr |
| Sep 21, 7:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Sep 21, 9:14 PM EDT | Special Weather Statement | CTP | 46 min |
| Oct 2, 2:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 2, 2:55 PM EDT | Tornado Watch | SPC | 8 hr |
| Oct 2, 4:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 2, 7:24 PM EDT | Mesoscale Discussion | SPC | 81 min |
| Oct 2, 9:01 PM EDT | Severe Thunderstorm Warning | CTP | 44 min |
| Oct 8, 3:30 AM EDT | Dense Fog Advisory | CTP | 7 hr |
| Oct 11, 10:12 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Oct 13, 1:13 PM EDT | Frost Advisory | CTP | 19 hr |
| Oct 17, 2:28 PM EDT | Freeze Watch | CTP | 13 hr |
| Oct 18, 3:14 AM EDT | Frost Advisory | CTP | 30 hr |
| Oct 21, 1:13 AM EDT | Special Weather Statement | CTP | 62 min |
| Nov 2, 3:12 AM EDT | Special Weather Statement | CTP | 33 min |
| Nov 2, 3:46 AM EDT | Special Weather Statement | CTP | 29 min |
| Nov 2, 4:16 AM EDT | Special Weather Statement | CTP | 29 min |
| Nov 10, 2:15 AM EST | Wind Advisory | CTP | 13 hr |
| Nov 10, 8:33 AM EST | Snow Squall Warning | CTP | 42 min |
| Nov 10, 11:02 AM EST | Special Weather Statement | CTP | 28 min |
| Nov 14, 4:31 AM EST | Winter Storm Watch | CTP | 11 hr |
| Nov 14, 3:40 PM EST | Winter Storm Warning | CTP | 38 hr |
| Nov 15, 9:56 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 15, 4:39 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 23, 11:02 AM EST | Winter Weather Advisory | CTP | 27 hr |
| Nov 24, 10:08 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Nov 29, 1:26 PM EST | Winter Weather Advisory | CTP | 24 hr |
| Dec 2, 7:37 PM EST | Dense Fog Advisory | CTP | 8 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 archive20172019
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.