Alert archive / Pennsylvania / Clarion County
Weather alerts in Clarion County, Pennsylvania, 2017
128 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Clarion County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 128
- Warnings
- 48
- Watches
- 11
- Advisories
- 22
- Busiest month
- August25 alerts
- Busiest day
- August 22, 201711 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 3 tornado warnings covering Clarion County in 2017 had a tornado report inside them; 4 of 6 tornado reports fell inside a warning, on average 11 minutes after it went out.
Clarion County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 2 | 33% | 6 | 67% | 11 min |
| Severe thunderstorm warnings | 35 | 29 | 17% | 23 | 87% | 19 min |
| Flash flood warnings | 4 | 3 | 25% | 8 | 100% | 59 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 14 | 8 | 43% | 18 | 67% | 11 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 225 | 186 | 17% | 518 | 88% | 21 min |
| NWS Pittsburgh, PA: flash flood warnings | 76 | 64 | 16% | 268 | 96% | 112 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 1, 9:41 PM EST | Freezing Rain Advisory | PBZ | 8 hr |
| Jan 9, 11:47 AM EST | Winter Weather Advisory | PBZ | 35 hr |
| Jan 12, 6:39 AM EST | Flash Flood Watch | PBZ | 10 hr |
| Jan 12, 9:31 AM EST | Flash Flood Warning | PBZ | 3 hr |
| Jan 12, 1:56 PM EST | Severe Thunderstorm Warning | PBZ | 34 min |
| Jan 12, 2:15 PM EST | Severe Thunderstorm Warning | PBZ | 45 min |
| Jan 12, 2:22 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Jan 12, 2:24 PM EST | Severe Thunderstorm Warning | PBZ | 51 min |
| Jan 12, 2:40 PM EST | Special Weather Statement | PBZ | 80 min |
| Jan 12, 5:38 PM EST | River Flood Warning | PBZ | 33 hr |
| Jan 12, 5:38 PM EST | River Flood Warning | PBZ | 35 hr |
| Jan 21, 12:44 AM EST | Dense Fog Advisory | PBZ | 7 hr |
| Jan 30, 12:00 PM EST | Special Weather Statement | PBZ | 2 hr |
| Jan 30, 1:46 PM EST | Winter Weather Advisory | PBZ | 21 hr |
| Feb 8, 2:11 PM EST | Winter Weather Advisory | PBZ | 21 hr |
| Feb 8, 9:40 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 12, 3:40 AM EST | Wind Advisory | PBZ | 31 hr |
| Feb 12, 3:40 AM EST | Winter Weather Advisory | PBZ | 28 hr |
| Feb 12, 8:26 PM EST | Special Weather Statement | PBZ | 49 min |
| Feb 12, 9:30 PM EST | Special Weather Statement | PBZ | 60 min |
| Mar 1, 2:19 AM EST | Mesoscale Discussion | SPC | 86 min |
| Mar 1, 12:44 PM EST | Wind Advisory | PBZ | 17 hr |
| Mar 1, 5:22 PM EST | Severe Thunderstorm Warning | PBZ | 23 min |
| Mar 3, 10:09 AM EST | Special Weather Statement | PBZ | 66 min |
| Mar 3, 11:11 AM EST | Special Weather Statement | PBZ | 79 min |
| Mar 3, 11:22 AM EST | Special Weather Statement | PBZ | 23 min |
| Mar 7, 11:52 AM EST | Wind Advisory | PBZ | 39 hr |
| Mar 9, 3:43 AM EST | Winter Weather Advisory | PBZ | 33 hr |
| Mar 10, 11:39 AM EST | Special Weather Statement | PBZ | 51 min |
| Mar 12, 3:31 PM EDT | Winter Storm Warning | PBZ | 44 hr |
| Mar 17, 8:23 PM EDT | Winter Weather Advisory | PBZ | 13 hr |
| Apr 16, 2:15 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 20, 2:27 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Apr 20, 2:40 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Apr 20, 3:14 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Apr 20, 8:40 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Apr 20, 9:38 PM EDT | Severe Thunderstorm Warning | PBZ | 22 min |
| Apr 30, 2:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 1, 11:59 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 1, 12:32 PM EDT | Tornado Watch | SPC | 4 hr |
| May 1, 2:26 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| May 1, 2:47 PM EDT | Severe Thunderstorm Warning | PBZ | 58 min |
| May 1, 2:50 PM EDT | Tornado Warning | PBZ | 25 min |
| May 1, 3:10 PM EDT | Severe Thunderstorm Warning | PBZ | 65 min |
| May 1, 3:19 PM EDT | Tornado Warning | PBZ | 26 min |
| May 1, 3:34 PM EDT | Severe Thunderstorm Warning | PBZ | 56 min |
| May 2, 4:37 AM EDT | Wind Advisory | PBZ | 14 hr |
| May 5, 4:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 5, 6:34 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| May 5, 9:28 PM EDT | Areal Flood Warning | PBZ | 12 hr |
| May 18, 4:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| May 18, 5:11 PM EDT | Severe Thunderstorm Warning | PBZ | 19 min |
| May 28, 4:01 PM EDT | Severe Thunderstorm Warning | PBZ | 44 min |
| May 28, 4:45 PM EDT | Severe Thunderstorm Warning | PBZ | 30 min |
| May 28, 4:46 PM EDT | Flash Flood Warning | PBZ | 119 min |
| May 28, 4:49 PM EDT | Tornado Warning | PBZ | 26 min |
| May 28, 5:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| May 28, 6:40 PM EDT | Areal Flood Warning | PBZ | 3 hr |
| May 30, 12:03 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 30, 12:39 PM EDT | Severe Thunderstorm Warning | PBZ | 51 min |
| May 30, 12:39 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 31, 2:05 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jun 15, 4:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 15, 4:28 PM EDT | Special Weather Statement | PBZ | 32 min |
| Jun 18, 12:31 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 18, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 18, 3:14 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Jun 18, 3:57 PM EDT | Severe Thunderstorm Warning | PBZ | 48 min |
| Jun 18, 4:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 19, 6:18 PM EDT | Severe Thunderstorm Warning | PBZ | 27 min |
| Jun 22, 12:36 PM EDT | Severe Thunderstorm Warning | PBZ | 24 min |
| Jun 22, 12:59 PM EDT | Severe Thunderstorm Warning | PBZ | 24 min |
| Jun 22, 1:18 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 10:01 PM EDT | Severe Thunderstorm Warning | PBZ | 44 min |
| Jul 1, 8:16 PM EDT | Special Weather Statement | PBZ | 29 min |
| Jul 6, 5:50 PM EDT | Areal Flood Advisory | PBZ | 115 min |
| Jul 11, 6:44 PM EDT | Special Weather Statement | PBZ | 31 min |
| Jul 20, 11:36 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Jul 20, 3:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 3:55 PM EDT | Special Weather Statement | PBZ | 35 min |
| Jul 23, 8:37 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jul 23, 8:56 PM EDT | Flash Flood Warning | PBZ | 4 hr |
| Jul 27, 2:13 PM EDT | Flash Flood Watch | PBZ | 42 hr |
| Aug 4, 11:38 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 1:25 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 4, 3:12 PM EDT | Severe Thunderstorm Warning | PBZ | 33 min |
| Aug 4, 3:32 PM EDT | Special Weather Statement | PBZ | 28 min |
| Aug 4, 3:45 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Aug 4, 3:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 4, 6:46 PM EDT | Severe Thunderstorm Warning | PBZ | 59 min |
| Aug 4, 7:30 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Aug 4, 7:41 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 7:51 PM EDT | Severe Thunderstorm Warning | PBZ | 54 min |
| Aug 19, 2:13 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 19, 2:45 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 19, 4:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 20, 3:26 AM EDT | Dense Fog Advisory | PBZ | 6 hr |
| Aug 22, 11:54 AM EDT | Mesoscale Discussion | SPC | 66 min |
| Aug 22, 12:39 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 22, 1:23 PM EDT | Severe Thunderstorm Warning | PBZ | 52 min |
| Aug 22, 1:33 PM EDT | Severe Thunderstorm Warning | PBZ | 42 min |
| Aug 22, 1:52 PM EDT | Severe Thunderstorm Warning | PBZ | 40 min |
| Aug 22, 1:55 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Aug 22, 2:02 PM EDT | Severe Thunderstorm Warning | PBZ | 43 min |
| Aug 22, 2:44 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Aug 22, 4:34 PM EDT | Special Weather Statement | PBZ | 41 min |
| Aug 22, 4:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Aug 22, 5:08 PM EDT | Severe Thunderstorm Warning | PBZ | 52 min |
| Sep 14, 9:08 PM EDT | Dense Fog Advisory | PBZ | 13 hr |
| Sep 15, 9:30 PM EDT | Dense Fog Advisory | PBZ | 12 hr |
| Sep 30, 1:01 PM EDT | Frost Advisory | PBZ | 20 hr |
| Oct 10, 1:40 AM EDT | Dense Fog Advisory | PBZ | 8 hr |
| Oct 15, 3:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Oct 15, 5:18 PM EDT | Special Weather Statement | PBZ | 57 min |
| Nov 5, 5:28 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Nov 5, 7:06 PM EST | Mesoscale Discussion | SPC | 84 min |
| Nov 5, 7:26 PM EST | Severe Thunderstorm Warning | PBZ | 64 min |
| Nov 5, 8:13 PM EST | Severe Thunderstorm Warning | PBZ | 47 min |
| Nov 18, 9:57 AM EST | Flood Watch | PBZ | 16 hr |
| Dec 10, 3:01 AM EST | Winter Storm Watch | PBZ | 33 hr |
| Dec 11, 12:05 PM EST | Lake Effect Snow Warning | PBZ | 40 hr |
| Dec 12, 7:29 AM EST | Special Weather Statement | PBZ | 61 min |
| Dec 13, 2:59 AM EST | Winter Weather Advisory | PBZ | 31 hr |
| Dec 15, 6:02 PM EST | Special Weather Statement | PBZ | 58 min |
| Dec 21, 11:58 AM EST | Winter Weather Advisory | PBZ | 17 hr |
| Dec 23, 2:04 PM EST | Winter Weather Advisory | PBZ | 46 hr |
| Dec 25, 12:18 AM EST | Special Weather Statement | PBZ | 57 min |
| Dec 25, 1:16 AM EST | Special Weather Statement | PBZ | 59 min |
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 archive20162018
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.