Alert archive / Pennsylvania / Mesoscale Discussions
Mesoscale Discussions in Pennsylvania, 2012
127 mesoscale discussions in 2012. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of mesoscale discussions reaches back to 2003.
Mesoscale Discussions by county
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Mesoscale Discussions
- 127
- Busiest month
- July36 mesoscale discussions
- Busiest day
- May 29, 20128 mesoscale discussions
Over time
By month
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 | Counties | Lasted |
|---|---|---|---|---|
| Jan 2, 12:37 AM EST | Mesoscale Discussion | SPC | Crawford, Erie, Warren | 4 hr |
| Jan 17, 5:37 PM EST | Mesoscale Discussion | SPC | Armstrong, Beaver, Butler, Clarion, Crawford, Elk and 7 more | 113 min |
| Jan 21, 12:59 AM EST | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Bedford, Berks, Blair and 29 more | 4 hr |
| Jan 21, 7:07 AM EST | Mesoscale Discussion | SPC | Chester, Delaware, Philadelphia | 3 hr |
| Jan 23, 3:26 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 9 more | 94 min |
| Feb 23, 11:48 PM EST | Mesoscale Discussion | SPC | Bradford, Potter, Susquehanna, Tioga, Wayne | 4 hr |
| Feb 29, 11:05 AM EST | Mesoscale Discussion | SPC | Susquehanna, Wayne | 4 hr |
| Feb 29, 7:30 PM EST | Mesoscale Discussion | SPC | Beaver, Greene, Lawrence, Mercer, Washington | 30 min |
| Mar 28, 10:23 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Bedford, Blair, Cambria, Fayette and 8 more | 2 hr |
| Apr 16, 1:33 PM EDT | Mesoscale Discussion | SPC | Armstrong, Cameron, Clarion, Clearfield, Elk, Forest and 6 more | 87 min |
| May 2, 4:56 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 20 more | 2 hr |
| May 3, 5:45 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Centre, Clinton, Columbia, Cumberland and 14 more | 60 min |
| May 4, 12:19 AM EDT | Mesoscale Discussion | SPC | Bradford, Tioga | 86 min |
| May 4, 1:26 PM EDT | Mesoscale Discussion | SPC | Adams, Armstrong, Bedford, Berks, Blair, Bucks and 47 more | 2 hr |
| May 7, 1:40 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Fayette, Greene, Washington, Westmoreland | 2 hr |
| May 16, 12:27 PM EDT | Mesoscale Discussion | SPC | Bradford, Susquehanna, Wayne, Wyoming | 2 hr |
| May 16, 3:37 PM EDT | Mesoscale Discussion | SPC | Bradford, Susquehanna, Wayne, Wyoming | 113 min |
| May 26, 1:17 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Columbia, Dauphin, Lancaster and 10 more | 88 min |
| May 26, 2:08 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Columbia, Dauphin, Lancaster and 10 more | 37 min |
| May 26, 6:04 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Columbia, Cumberland and 13 more | 56 min |
| May 27, 12:56 PM EDT | Mesoscale Discussion | SPC | Armstrong, Beaver, Butler, Clarion, Crawford, Erie and 5 more | 64 min |
| May 27, 1:41 PM EDT | Mesoscale Discussion | SPC | Allegheny, Bedford, Blair, Cambria, Cumberland, Fayette and 11 more | 64 min |
| May 27, 4:12 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 18 more | 63 min |
| May 27, 6:34 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Cumberland, Fayette and 9 more | 56 min |
| May 28, 11:19 AM EDT | Mesoscale Discussion | SPC | Lackawanna, Pike, Susquehanna, Wayne, Wyoming | 56 min |
| May 28, 2:25 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Crawford, Erie, Lackawanna, Luzerne and 11 more | 65 min |
| May 29, 9:48 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Clearfield and 8 more | 87 min |
| May 29, 11:43 AM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Susquehanna, Wayne, Wyoming | 62 min |
| May 29, 12:01 PM EDT | Mesoscale Discussion | SPC | Bradford, Clinton, Lackawanna, Lycoming, Montour, Northumberland and 7 more | 59 min |
| May 29, 1:25 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 19 more | 65 min |
| May 29, 2:13 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Bradford, Bucks, Carbon and 35 more | 62 min |
| May 29, 3:12 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Cambria and 36 more | 63 min |
| May 29, 4:40 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 22 more | 65 min |
| May 29, 7:01 PM EDT | Mesoscale Discussion | SPC | Bucks, Philadelphia | 89 min |
| Jun 1, 12:29 PM EDT | Mesoscale Discussion | SPC | Franklin, Fulton | 61 min |
| Jun 1, 1:03 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Fayette, Franklin, Fulton, Somerset and 1 more | 87 min |
| Jun 1, 3:35 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Cumberland, Franklin and 6 more | 55 min |
| Jun 1, 3:49 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Lancaster, Philadelphia, York | 56 min |
| Jun 1, 4:25 PM EDT | Mesoscale Discussion | SPC | Berks, Chester, Delaware, Montgomery, Philadelphia | 65 min |
| Jun 1, 5:46 PM EDT | Mesoscale Discussion | SPC | Cameron, Centre, Clearfield, Clinton, Elk, Forest and 10 more | 89 min |
| Jun 1, 6:54 PM EDT | Mesoscale Discussion | SPC | Berks, Chester, Dauphin, Lancaster, Lebanon, York | 2 hr |
| Jun 3, 1:37 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bucks, Cambria and 23 more | 2 hr |
| Jun 22, 12:18 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 36 more | 2 hr |
| Jun 22, 4:33 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Lehigh and 4 more | 87 min |
| Jun 22, 6:42 PM EDT | Mesoscale Discussion | SPC | Adams, Bucks, Chester, Delaware, Lancaster, Montgomery and 2 more | 63 min |
| Jun 25, 3:44 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Cumberland, Dauphin and 17 more | 2 hr |
| Jun 25, 6:21 AM EDT | Mesoscale Discussion | SPC | Delaware, Philadelphia | 24 min |
| Jun 28, 8:53 PM EDT | Mesoscale Discussion | SPC | Erie | 97 min |
| Jun 29, 12:45 AM EDT | Mesoscale Discussion | SPC | Armstrong, Blair, Butler, Cambria, Cameron, Centre and 18 more | 90 min |
| Jun 29, 3:41 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Cumberland and 19 more | 94 min |
| Jun 29, 3:07 PM EDT | Mesoscale Discussion | SPC | Greene, Washington | 53 min |
| Jun 29, 6:03 PM EDT | Mesoscale Discussion | SPC | Fayette, Greene, Somerset, Washington | 87 min |
| Jun 29, 7:51 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Fayette, Franklin, Fulton, Greene and 2 more | 114 min |
| Jul 1, 12:11 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Dauphin and 16 more | 64 min |
| Jul 1, 3:25 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 2 more | 95 min |
| Jul 1, 7:22 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 4 more | 83 min |
| Jul 1, 8:32 PM EDT | Mesoscale Discussion | SPC | Bedford, Fayette, Greene, Somerset, Westmoreland | 88 min |
| Jul 3, 10:20 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Fayette, Greene and 4 more | 85 min |
| Jul 3, 7:40 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Forest, Lawrence, Mercer, Venango and 1 more | 2 hr |
| Jul 4, 8:38 AM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Lawrence, Mercer, Venango, Warren | 2 hr |
| Jul 4, 4:04 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Fayette, Greene, Lawrence and 3 more | 56 min |
| Jul 4, 6:46 PM EDT | Mesoscale Discussion | SPC | Bradford, Bucks, Carbon, Lackawanna, Lehigh, Luzerne and 6 more | 59 min |
| Jul 4, 8:05 PM EDT | Mesoscale Discussion | SPC | Bedford, Fayette, Fulton, Somerset | 55 min |
| Jul 4, 9:48 PM EDT | Mesoscale Discussion | SPC | Beaver, Lawrence, Washington | 87 min |
| Jul 5, 4:37 PM EDT | Mesoscale Discussion | SPC | Adams, Blair, Centre, Cumberland, Dauphin, Franklin and 6 more | 113 min |
| Jul 7, 11:19 AM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Bucks, Cameron, Carbon, Centre and 32 more | 86 min |
| Jul 7, 1:36 PM EDT | Mesoscale Discussion | SPC | Bradford, Carbon, Columbia, Lackawanna, Lehigh, Luzerne and 14 more | 84 min |
| Jul 7, 1:48 PM EDT | Mesoscale Discussion | SPC | Armstrong, Beaver, Butler, Cameron, Centre, Clarion and 13 more | 57 min |
| Jul 7, 3:57 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 41 more | 2 hr |
| Jul 7, 5:43 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Bucks, Carbon, Chester and 18 more | 62 min |
| Jul 18, 10:25 AM EDT | Mesoscale Discussion | SPC | Berks, Blair, Bradford, Bucks, Cambria, Cameron and 39 more | 2 hr |
| Jul 18, 12:54 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Greene, Lawrence, Washington | 2 hr |
| Jul 18, 3:44 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Chester, Delaware, Lancaster and 5 more | 91 min |
| Jul 18, 4:21 PM EDT | Mesoscale Discussion | SPC | Greene, Washington | 84 min |
| Jul 19, 6:53 PM EDT | Mesoscale Discussion | SPC | Adams, Chester, Cumberland, Dauphin, Delaware, Franklin and 5 more | 97 min |
| Jul 23, 12:32 PM EDT | Mesoscale Discussion | SPC | Bradford, Carbon, Columbia, Lackawanna, Lehigh, Luzerne and 12 more | 88 min |
| Jul 23, 4:01 PM EDT | Mesoscale Discussion | SPC | Bradford, Carbon, Columbia, Lackawanna, Luzerne, Lycoming and 12 more | 119 min |
| Jul 24, 11:48 AM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 13 more | 87 min |
| Jul 26, 1:15 AM EDT | Mesoscale Discussion | SPC | Butler, Clarion, Crawford, Elk, Erie, Forest and 6 more | 2 hr |
| Jul 26, 4:31 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 21 more | 89 min |
| Jul 26, 12:26 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 16 more | 2 hr |
| Jul 26, 1:50 PM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more | 115 min |
| Jul 26, 3:37 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Berks and 55 more | 113 min |
| Jul 26, 6:04 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Dauphin, Delaware and 15 more | 86 min |
| Jul 26, 6:06 PM EDT | Mesoscale Discussion | SPC | Allegheny, Fayette, Greene, Somerset, Washington, Westmoreland | 84 min |
| Jul 26, 7:28 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 92 min |
| Jul 28, 12:26 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Dauphin and 11 more | 2 hr |
| Jul 28, 4:18 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Cumberland and 14 more | 87 min |
| Jul 28, 8:00 PM EDT | Mesoscale Discussion | SPC | Berks, Chester, Lehigh | 30 min |
| Aug 4, 10:46 PM EDT | Mesoscale Discussion | SPC | Mercer | 119 min |
| Aug 5, 12:06 PM EDT | Mesoscale Discussion | SPC | Cameron, Clarion, Clearfield, Crawford, Elk, Forest and 5 more | 84 min |
| Aug 5, 2:49 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Centre and 34 more | 86 min |
| Aug 5, 6:38 PM EDT | Mesoscale Discussion | SPC | Philadelphia | 2 hr |
| Aug 9, 12:46 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Lycoming, Potter, Sullivan, Susquehanna and 2 more | 89 min |
| Aug 9, 4:18 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Greene, Washington | 57 min |
| Aug 10, 8:21 AM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Lehigh, Monroe, Montgomery and 4 more | 2 hr |
| Aug 10, 12:49 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 16 more | 86 min |
| Aug 10, 3:31 PM EDT | Mesoscale Discussion | SPC | Adams, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 2 more | 89 min |
| Aug 10, 7:31 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Chester, Cumberland, Delaware, Lancaster and 2 more | 119 min |
| Aug 14, 2:07 PM EDT | Mesoscale Discussion | SPC | Adams, Cumberland, Franklin, Fulton, York | 113 min |
| Aug 14, 9:57 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Carbon, Chester, Columbia, Cumberland and 16 more | 2 hr |
| Sep 6, 1:04 PM EDT | Mesoscale Discussion | SPC | McKean, Potter | 56 min |
| Sep 6, 6:45 PM EDT | Mesoscale Discussion | SPC | Bradford, Columbia, Lackawanna, Luzerne, Lycoming, Montour and 8 more | 60 min |
| Sep 7, 2:16 PM EDT | Mesoscale Discussion | SPC | Beaver, Butler, Clarion, Crawford, Erie, Forest and 4 more | 59 min |
| Sep 7, 6:38 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 23 more | 97 min |
| Sep 8, 12:57 AM EDT | Mesoscale Discussion | SPC | Beaver, Crawford, Erie, Lawrence, Mercer, Venango | 2 hr |
| Sep 8, 5:00 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 20 more | 60 min |
| Sep 8, 8:42 AM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Carbon, Clinton, Columbia, Cumberland and 18 more | 93 min |
| Sep 8, 11:38 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Bradford, Carbon, Centre and 29 more | 97 min |
| Sep 8, 2:12 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 6 more | 93 min |
| Sep 8, 4:22 PM EDT | Mesoscale Discussion | SPC | Bucks, Delaware, Montgomery, Philadelphia | 53 min |
| Sep 18, 8:49 AM EDT | Mesoscale Discussion | SPC | Adams, Cumberland, Franklin, Lancaster, York | 116 min |
| Sep 18, 11:14 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 6 more | 91 min |
| Sep 18, 11:19 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 23 more | 86 min |
| Sep 18, 1:56 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 23 more | 64 min |
| Sep 18, 4:21 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 11 more | 114 min |
| Sep 22, 3:09 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Dauphin and 14 more | 2 hr |
| Sep 22, 6:31 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Elk and 7 more | 119 min |
| Oct 18, 3:07 PM EDT | Mesoscale Discussion | SPC | Greene | 83 min |
| Oct 19, 4:48 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Carbon, Chester, Columbia and 17 more | 87 min |
| Oct 30, 4:34 AM EDT | Mesoscale Discussion | SPC | Fayette, Somerset | 4 hr |
| Nov 7, 12:55 PM EST | Mesoscale Discussion | SPC | Bucks, Delaware, Philadelphia | 3 hr |
| Dec 7, 3:44 AM EST | Mesoscale Discussion | SPC | Bradford, Cameron, Centre, Clearfield, Clinton, Columbia and 15 more | 6 hr |
| Dec 24, 10:34 AM EST | Mesoscale Discussion | SPC | Fayette, Greene | 2 hr |
| Dec 26, 11:40 AM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Centre and 17 more | 6 hr |
| Dec 26, 12:48 PM EST | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Bradford, Bucks, Carbon and 27 more | 6 hr |
| Dec 26, 2:14 PM EST | Mesoscale Discussion | SPC | Bradford, Susquehanna, Tioga, Wayne | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Berks County39
- Lancaster County39
- York County38
- Lehigh County38
- Chester County37
- Carbon County37
- Bucks County36
- Northumberland County35
- Schuylkill County35
- Wayne County35
- Montgomery County35
- Monroe County35
- Northampton County35
- Cumberland County34
- Dauphin County34
- Delaware County34
- Philadelphia County34
- Pike County34
- Adams County33
- Lebanon County32
- Perry County32
- Luzerne County32
- Montour County31
- Susquehanna County30
- Lackawanna County30
- Columbia County29
- Franklin County29
- Snyder County29
- Beaver County28
- Huntingdon County28
- Juniata County28
- Bradford County28
- Wyoming County28
- Lawrence County27
- Washington County27
- Butler County26
- Mercer County26
- Tioga County26
- Sullivan County26
- Crawford County25
27 more counties
- Warren County25
- Armstrong County25
- Clarion County25
- Venango County25
- Allegheny County25
- Fayette County25
- Fulton County25
- Union County25
- Greene County25
- Forest County24
- Westmoreland County24
- Lycoming County24
- Jefferson County23
- Clearfield County23
- Clinton County23
- Mifflin County23
- Somerset County23
- Bedford County22
- Potter County22
- Cameron County22
- Elk County21
- Indiana County21
- McKean County20
- Cambria County20
- Centre County20
- Blair County19
- Erie County15
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20112013
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.