Alert archive / Pennsylvania / Butler County
Weather alerts in Butler County, Pennsylvania, 2019
171 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Butler County and its neighbors
Each county as a circle sized by its count in 2019. Tap one for its archive.
- Alerts
- 171
- Warnings
- 60
- Watches
- 20
- Advisories
- 34
- Busiest month
- May34 alerts
- Busiest day
- May 28, 201916 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 3 tornado warnings covering Butler County in 2019 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 4 minutes after it went out.
Butler County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 1 | 100% | 4 min |
| Severe thunderstorm warnings | 41 | 30 | 27% | 35 | 69% | 19 min |
| Flash flood warnings | 7 | 5 | 29% | 5 | 100% | 67 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Pittsburgh, PA: tornado warnings | 19 | 7 | 63% | 16 | 50% | 8 min |
| NWS Pittsburgh, PA: severe thunderstorm warnings | 311 | 231 | 26% | 611 | 82% | 19 min |
| NWS Pittsburgh, PA: flash flood warnings | 105 | 80 | 24% | 282 | 87% | 67 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 8, 1:54 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Jan 8, 4:04 PM EST | Special Weather Statement | PBZ | 41 min |
| Jan 8, 4:44 PM EST | Special Weather Statement | PBZ | 31 min |
| Jan 8, 8:44 PM EST | Special Weather Statement | PBZ | 61 min |
| Jan 16, 4:45 AM EST | Winter Weather Advisory | PBZ | 6 hr |
| Jan 17, 2:54 PM EST | Winter Storm Watch | PBZ | 22 hr |
| Jan 18, 1:10 PM EST | Winter Storm Warning | PBZ | 48 hr |
| Jan 18, 1:10 PM EST | Winter Weather Advisory | PBZ | 48 hr |
| Jan 20, 10:03 AM EST | Wind Chill Advisory | PBZ | 27 hr |
| Jan 22, 6:30 PM EST | Winter Weather Advisory | PBZ | 19 hr |
| Jan 23, 1:10 PM EST | Flood Watch | PBZ | 15 hr |
| Jan 28, 11:52 PM EST | Winter Weather Advisory | PBZ | 9 hr |
| Jan 29, 3:36 AM EST | Wind Chill Warning | PBZ | 59 hr |
| Jan 30, 3:20 AM EST | Special Weather Statement | PBZ | 55 min |
| Jan 30, 4:06 AM EST | Winter Weather Advisory | PBZ | 5 hr |
| Jan 30, 5:23 AM EST | Snow Squall Warning | PBZ | 52 min |
| Jan 31, 2:45 PM EST | Wind Chill Advisory | PBZ | 3 hr |
| Feb 6, 11:10 AM EST | Flood Watch | PBZ | 41 hr |
| Feb 6, 11:10 PM EST | Dense Fog Advisory | PBZ | 11 hr |
| Feb 10, 3:33 AM EST | Winter Weather Advisory | PBZ | 57 hr |
| Feb 11, 9:54 AM EST | Flood Watch | PBZ | 36 hr |
| Feb 12, 4:16 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 12, 2:19 PM EST | Wind Advisory | PBZ | 26 hr |
| Feb 17, 3:18 AM EST | Winter Weather Advisory | PBZ | 22 hr |
| Feb 19, 3:05 AM EST | Winter Weather Advisory | PBZ | 45 hr |
| Feb 22, 3:35 AM EST | High Wind Watch | PBZ | 35 hr |
| Feb 23, 2:34 PM EST | High Wind Warning | PBZ | 43 hr |
| Feb 24, 7:45 PM EST | Wind Advisory | PBZ | 14 hr |
| Mar 2, 1:31 PM EST | Winter Weather Advisory | PBZ | 35 hr |
| Apr 1, 1:03 AM EDT | Special Weather Statement | PBZ | 3 hr |
| Apr 1, 1:06 AM EDT | Special Weather Statement | PBZ | 3 hr |
| Apr 14, 3:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Apr 14, 4:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Apr 14, 5:57 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 14, 6:46 PM EDT | Tornado Watch | SPC | 8 hr |
| Apr 14, 6:59 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Apr 14, 7:15 PM EDT | Severe Thunderstorm Warning | PBZ | 34 min |
| Apr 14, 7:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Apr 14, 7:45 PM EDT | Severe Thunderstorm Warning | PBZ | 30 min |
| Apr 14, 7:46 PM EDT | Severe Thunderstorm Warning | PBZ | 44 min |
| Apr 20, 4:47 PM EDT | Special Weather Statement | PBZ | 43 min |
| Apr 20, 5:13 PM EDT | Special Weather Statement | PBZ | 47 min |
| Apr 20, 6:26 PM EDT | Special Weather Statement | PBZ | 34 min |
| Apr 20, 6:38 PM EDT | Severe Thunderstorm Warning | PBZ | 15 min |
| Apr 23, 12:56 PM EDT | Special Weather Statement | PBZ | 34 min |
| May 18, 7:44 PM EDT | Severe Thunderstorm Warning | PBZ | 17 min |
| May 23, 12:20 AM EDT | Special Weather Statement | PBZ | 25 min |
| May 23, 8:53 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 12:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 4:50 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 25, 6:55 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| May 25, 7:31 PM EDT | Severe Thunderstorm Warning | PBZ | 44 min |
| May 28, 1:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| May 28, 1:48 PM EDT | Tornado Watch | SPC | 8 hr |
| May 28, 2:28 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| May 28, 2:54 PM EDT | Severe Thunderstorm Warning | PBZ | 51 min |
| May 28, 3:01 PM EDT | Severe Thunderstorm Warning | PBZ | 44 min |
| May 28, 3:36 PM EDT | Severe Thunderstorm Warning | PBZ | 39 min |
| May 28, 3:41 PM EDT | Severe Thunderstorm Warning | PBZ | 49 min |
| May 28, 4:28 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| May 28, 4:32 PM EDT | Severe Thunderstorm Warning | PBZ | 43 min |
| May 28, 4:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 5:12 PM EDT | Severe Thunderstorm Warning | PBZ | 33 min |
| May 28, 5:29 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| May 28, 6:03 PM EDT | Flash Flood Warning | PBZ | 5 hr |
| May 28, 6:15 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| May 28, 6:32 PM EDT | Flash Flood Warning | PBZ | 5 hr |
| May 28, 7:53 PM EDT | Severe Thunderstorm Warning | PBZ | 37 min |
| May 28, 8:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 28, 11:15 PM EDT | Areal Flood Warning | PBZ | 24 hr |
| May 28, 11:17 PM EDT | Areal Flood Warning | PBZ | 12 hr |
| May 29, 3:37 AM EDT | Flash Flood Watch | PBZ | 17 hr |
| May 29, 12:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| May 29, 12:56 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 29, 1:25 PM EDT | Special Weather Statement | PBZ | 20 min |
| May 29, 1:52 PM EDT | Severe Thunderstorm Warning | PBZ | 53 min |
| May 29, 2:16 PM EDT | Flash Flood Warning | PBZ | 109 min |
| May 30, 4:20 AM EDT | Flash Flood Watch | PBZ | 17 hr |
| May 30, 7:02 PM EDT | Special Weather Statement | PBZ | 43 min |
| Jun 1, 5:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 2, 4:17 AM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jun 10, 5:21 PM EDT | Areal Flood Advisory | PBZ | 54 min |
| Jun 10, 5:56 PM EDT | Areal Flood Advisory | PBZ | 64 min |
| Jun 16, 5:20 PM EDT | Tornado Warning | PBZ | 25 min |
| Jun 16, 5:43 PM EDT | Tornado Warning | PBZ | 32 min |
| Jun 16, 6:14 PM EDT | Tornado Warning | PBZ | 31 min |
| Jun 17, 3:38 AM EDT | Flash Flood Watch | PBZ | 4 days |
| Jun 19, 4:32 PM EDT | Flash Flood Warning | PBZ | 85 min |
| Jun 19, 5:32 PM EDT | Flash Flood Warning | PBZ | 96 min |
| Jun 19, 7:34 PM EDT | Areal Flood Warning | PBZ | 6 hr |
| Jun 20, 11:36 AM EDT | Areal Flood Warning | PBZ | 12 hr |
| Jun 20, 11:28 PM EDT | Areal Flood Warning | PBZ | 14 hr |
| Jun 24, 3:37 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 24, 6:25 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Jun 24, 6:58 PM EDT | Severe Thunderstorm Warning | PBZ | 47 min |
| Jun 24, 7:44 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Jun 29, 12:07 PM EDT | Severe Thunderstorm Warning | PBZ | 38 min |
| Jun 29, 12:40 PM EDT | Severe Thunderstorm Warning | PBZ | 35 min |
| Jun 29, 1:22 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jun 29, 1:54 PM EDT | Special Weather Statement | PBZ | 36 min |
| Jun 29, 2:33 PM EDT | Special Weather Statement | PBZ | 27 min |
| Jun 29, 3:54 PM EDT | Special Weather Statement | PBZ | 36 min |
| Jun 29, 3:59 PM EDT | Severe Thunderstorm Warning | PBZ | 20 min |
| Jun 29, 5:16 PM EDT | Severe Thunderstorm Warning | PBZ | 14 min |
| Jul 2, 3:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 2, 4:18 PM EDT | Severe Thunderstorm Warning | PBZ | 27 min |
| Jul 2, 8:19 PM EDT | Special Weather Statement | PBZ | 26 min |
| Jul 4, 7:21 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jul 5, 12:31 PM EDT | Flash Flood Warning | PBZ | 3 hr |
| Jul 6, 11:30 AM EDT | Flash Flood Watch | PBZ | 10 hr |
| Jul 6, 2:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 3:04 PM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| Jul 6, 3:59 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jul 6, 4:04 PM EDT | Areal Flood Advisory | PBZ | 2 hr |
| Jul 7, 12:05 PM EDT | Flash Flood Watch | PBZ | 9 hr |
| Jul 7, 4:29 PM EDT | Areal Flood Advisory | PBZ | 106 min |
| Jul 11, 9:31 AM EDT | Special Weather Statement | PBZ | 29 min |
| Jul 11, 10:09 AM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Jul 11, 10:45 AM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 11, 1:01 PM EDT | Flash Flood Watch | PBZ | 7 hr |
| Jul 11, 3:27 PM EDT | Severe Thunderstorm Warning | PBZ | 33 min |
| Jul 16, 10:47 PM EDT | Severe Thunderstorm Warning | PBZ | 43 min |
| Jul 17, 3:21 PM EDT | Excessive Heat Watch | PBZ | 24 hr |
| Jul 18, 3:26 PM EDT | Heat Advisory | PBZ | 53 hr |
| Jul 19, 2:29 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 19, 4:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 8:23 AM EDT | Severe Thunderstorm Warning | PBZ | 37 min |
| Jul 21, 12:00 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 21, 4:19 PM EDT | Severe Thunderstorm Warning | PBZ | 26 min |
| Jul 22, 12:13 PM EDT | Areal Flood Advisory | PBZ | 3 hr |
| Aug 2, 5:48 PM EDT | Special Weather Statement | PBZ | 42 min |
| Aug 6, 4:35 PM EDT | Special Weather Statement | PBZ | 40 min |
| Aug 6, 5:26 PM EDT | Special Weather Statement | PBZ | 34 min |
| Aug 6, 6:12 PM EDT | Special Weather Statement | PBZ | 33 min |
| Aug 8, 12:37 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 15, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 2:27 PM EDT | Special Weather Statement | PBZ | 33 min |
| Aug 15, 5:00 PM EDT | Severe Thunderstorm Warning | PBZ | 32 min |
| Aug 17, 4:03 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 17, 5:01 PM EDT | Severe Thunderstorm Warning | PBZ | 44 min |
| Aug 19, 2:29 AM EDT | Special Weather Statement | PBZ | 46 min |
| Aug 20, 10:00 PM EDT | Special Weather Statement | PBZ | 45 min |
| Aug 20, 10:57 PM EDT | Areal Flood Advisory | PBZ | 91 min |
| Sep 1, 7:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Sep 11, 3:08 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 11, 4:00 PM EDT | Severe Thunderstorm Warning | PBZ | 45 min |
| Sep 11, 4:34 PM EDT | Severe Thunderstorm Warning | PBZ | 41 min |
| Sep 11, 4:59 PM EDT | Severe Thunderstorm Warning | PBZ | 46 min |
| Sep 11, 5:10 PM EDT | Severe Thunderstorm Warning | PBZ | 50 min |
| Sep 11, 5:22 PM EDT | Special Weather Statement | PBZ | 38 min |
| Oct 8, 12:13 AM EDT | Dense Fog Advisory | PBZ | 10 hr |
| Oct 12, 3:26 AM EDT | Frost Advisory | PBZ | 31 hr |
| Oct 31, 3:17 AM EDT | Wind Advisory | PBZ | 31 hr |
| Oct 31, 3:26 PM EDT | Areal Flood Advisory | PBZ | 2 hr |
| Oct 31, 3:41 PM EDT | Areal Flood Advisory | PBZ | 2 hr |
| Nov 26, 11:37 AM EST | Wind Advisory | PBZ | 39 hr |
| Nov 30, 3:50 AM EST | Winter Weather Advisory | PBZ | 36 hr |
| Dec 1, 4:32 PM EST | Severe Thunderstorm Warning | PBZ | 43 min |
| Dec 1, 4:50 PM EST | Special Weather Statement | PBZ | 25 min |
| Dec 1, 4:59 PM EST | Severe Thunderstorm Warning | PBZ | 46 min |
| Dec 4, 5:16 PM EST | Special Weather Statement | PBZ | 89 min |
| Dec 16, 3:54 AM EST | Winter Weather Advisory | PBZ | 31 hr |
| Dec 18, 11:51 AM EST | Special Weather Statement | PBZ | 84 min |
| Dec 18, 12:19 PM EST | Special Weather Statement | PBZ | 86 min |
| Dec 24, 5:10 PM EST | Dense Fog Advisory | PBZ | 17 hr |
| Dec 31, 12:20 PM EST | Special Weather Statement | PBZ | 25 min |
| Dec 31, 12:53 PM EST | Special Weather Statement | PBZ | 82 min |
| Dec 31, 2:27 PM EST | Special Weather Statement | PBZ | 93 min |
| Dec 31, 3:31 PM EST | Special Weather Statement | PBZ | 59 min |
| Dec 31, 4:30 PM EST | Special Weather Statement | PBZ | 75 min |
| Dec 31, 5:45 PM EST | Special Weather Statement | PBZ | 30 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 archive20182020
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.