Alert archive / Pennsylvania / Mesoscale Discussions
Mesoscale Discussions in Pennsylvania, 2022
131 mesoscale discussions in 2022. 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 2022. Tap one for its archive.
- Mesoscale Discussions
- 131
- Busiest month
- July25 mesoscale discussions
- Busiest day
- June 16, 20226 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 3, 11:06 AM EST | Mesoscale Discussion | SPC | Delaware, Philadelphia | 5 hr |
| Jan 7, 2:02 AM EST | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 5 hr |
| Jan 8, 10:37 PM EST | Mesoscale Discussion | SPC | Cameron, Clarion, Clearfield, Clinton, Crawford, Elk and 7 more | 4 hr |
| Jan 9, 2:35 AM EST | Mesoscale Discussion | SPC | Blair, Bradford, Cambria, Cameron, Centre, Clearfield and 21 more | 5 hr |
| Jan 9, 5:52 AM EST | Mesoscale Discussion | SPC | Carbon, Lackawanna, Luzerne, Monroe, Northampton, Pike and 1 more | 4 hr |
| Jan 10, 8:37 PM EST | Mesoscale Discussion | SPC | Bradford, Cameron, Centre, Clinton, Columbia, Elk and 14 more | 2 hr |
| Jan 16, 3:24 PM EST | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Bradford, Cambria, Cameron and 30 more | 5 hr |
| Jan 16, 4:24 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 9 more | 6 hr |
| Jan 16, 8:38 PM EST | Mesoscale Discussion | SPC | Beaver, Butler, Clarion, Crawford, Erie, Forest and 5 more | 6 hr |
| Jan 16, 11:12 PM EST | Mesoscale Discussion | SPC | Adams, Cumberland, Dauphin, Franklin, Fulton, Juniata and 3 more | 3 hr |
| Jan 17, 2:24 AM EST | Mesoscale Discussion | SPC | Erie | 6 hr |
| Jan 17, 8:22 AM EST | Mesoscale Discussion | SPC | Erie | 6 hr |
| Feb 3, 10:20 AM EST | Mesoscale Discussion | SPC | Beaver | 6 hr |
| Feb 3, 2:15 PM EST | Mesoscale Discussion | SPC | Bradford, Cameron, Clarion, Clinton, Elk, Forest and 5 more | 6 hr |
| Feb 3, 5:55 PM EST | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Greene, Lawrence, Mercer and 1 more | 4 hr |
| Feb 3, 8:29 PM EST | Mesoscale Discussion | SPC | Bradford, Cameron, Clinton, Elk, Lycoming, McKean and 3 more | 4 hr |
| Feb 3, 10:50 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clearfield, Indiana and 2 more | 4 hr |
| Feb 4, 5:32 AM EST | Mesoscale Discussion | SPC | Bradford, Carbon, Centre, Clinton, Columbia, Dauphin and 18 more | 4 hr |
| Feb 4, 10:20 AM EST | Mesoscale Discussion | SPC | Monroe, Northampton, Pike | 6 hr |
| Feb 19, 5:56 AM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 20 more | 5 hr |
| Feb 19, 10:09 AM EST | Mesoscale Discussion | SPC | Bradford, Cameron, Carbon, Centre, Clearfield, Clinton and 23 more | 4 hr |
| Feb 19, 12:58 PM EST | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Cumberland and 15 more | 4 hr |
| Feb 24, 6:24 PM EST | Mesoscale Discussion | SPC | Beaver, Butler, Lawrence, Mercer | 4 hr |
| Feb 24, 9:13 PM EST | Mesoscale Discussion | SPC | Adams, Armstrong, Bedford, Berks, Blair, Bucks and 45 more | 5 hr |
| Mar 7, 3:53 PM EST | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 36 more | 2 hr |
| Mar 7, 5:53 PM EST | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 10 more | 97 min |
| Mar 7, 7:42 PM EST | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 17 more | 93 min |
| Mar 12, 2:33 AM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Bedford, Blair, Cambria, Cameron and 13 more | 6 hr |
| Mar 12, 8:53 AM EST | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Lackawanna, Lehigh and 5 more | 4 hr |
| Mar 19, 2:33 PM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Carbon, Clinton, Columbia, Cumberland and 23 more | 3 hr |
| Mar 23, 4:35 PM EDT | Mesoscale Discussion | SPC | Greene, Washington | 115 min |
| Mar 23, 6:58 PM EDT | Mesoscale Discussion | SPC | Beaver, Greene, Washington | 2 hr |
| Mar 31, 12:07 PM EDT | Mesoscale Discussion | SPC | Adams, Armstrong, Bedford, Blair, Cambria, Cameron and 30 more | 83 min |
| Mar 31, 3:40 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 28 more | 2 hr |
| Mar 31, 7:13 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Dauphin and 14 more | 92 min |
| Mar 31, 9:43 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Chester, Delaware, Lancaster and 3 more | 92 min |
| Apr 14, 2:19 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 9 more | 116 min |
| Apr 18, 10:06 PM EDT | Mesoscale Discussion | SPC | Bradford, Columbia, Lackawanna, Luzerne, Lycoming, Monroe and 6 more | 5 hr |
| Apr 25, 3:39 PM EDT | Mesoscale Discussion | SPC | Crawford, Forest, Lawrence, McKean, Mercer, Venango and 1 more | 2 hr |
| May 1, 3:09 PM EDT | Mesoscale Discussion | SPC | Beaver, Lawrence, Washington | 2 hr |
| May 15, 3:05 PM EDT | Mesoscale Discussion | SPC | Adams, Bradford, Centre, Clinton, Columbia, Cumberland and 21 more | 85 min |
| May 16, 9:44 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Cameron, Centre and 16 more | 91 min |
| May 16, 11:22 AM EDT | Mesoscale Discussion | SPC | Bradford, Clinton, Columbia, Cumberland, Dauphin, Juniata and 13 more | 83 min |
| May 16, 12:01 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Northampton, Philadelphia | 119 min |
| May 16, 2:43 PM EDT | Mesoscale Discussion | SPC | Berks, Carbon, Lehigh, Monroe, Northampton, Pike and 1 more | 92 min |
| May 16, 6:23 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Lawrence, Mercer, Venango | 67 min |
| May 20, 10:39 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Cameron, Centre and 25 more | 96 min |
| May 20, 1:49 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 20 more | 86 min |
| May 20, 3:20 PM EDT | Mesoscale Discussion | SPC | Pike, Wayne | 85 min |
| May 20, 3:36 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 5 more | 84 min |
| May 21, 2:16 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Forest, McKean, Mercer, Venango and 1 more | 2 hr |
| May 21, 4:30 PM EDT | Mesoscale Discussion | SPC | Beaver, Butler, Crawford, Erie, Lawrence, Mercer | 90 min |
| May 21, 5:51 PM EDT | Mesoscale Discussion | SPC | McKean, Potter, Warren | 114 min |
| May 22, 12:20 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 35 more | 2 hr |
| May 22, 4:15 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 23 more | 90 min |
| May 22, 6:32 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 118 min |
| May 27, 11:55 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Dauphin, Delaware and 8 more | 95 min |
| May 27, 3:16 PM EDT | Mesoscale Discussion | SPC | Bucks, Delaware, Lehigh, Monroe, Montgomery, Northampton and 1 more | 89 min |
| May 27, 8:29 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Philadelphia | 91 min |
| Jun 1, 1:00 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bradford, Butler, Cameron and 18 more | 90 min |
| Jun 1, 4:47 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bradford, Butler, Cameron and 37 more | 88 min |
| Jun 1, 7:04 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Clearfield and 10 more | 86 min |
| Jun 2, 1:04 PM EDT | Mesoscale Discussion | SPC | Adams, Chester, Cumberland, Delaware, Franklin, Lancaster and 2 more | 116 min |
| Jun 7, 2:09 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 8 more | 2 hr |
| Jun 8, 6:26 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Greene, Washington | 2 hr |
| Jun 8, 11:17 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Cumberland, Fayette and 7 more | 118 min |
| Jun 9, 1:39 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Chester, Cumberland, Dauphin, Delaware and 10 more | 3 hr |
| Jun 13, 11:42 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Fayette, Greene, Washington, Westmoreland | 2 hr |
| Jun 14, 3:58 AM EDT | Mesoscale Discussion | SPC | Greene | 92 min |
| Jun 14, 8:44 AM EDT | Mesoscale Discussion | SPC | Fayette, Greene, Washington | 2 hr |
| Jun 15, 8:35 PM EDT | Mesoscale Discussion | SPC | Cameron, Clinton, McKean, Potter, Tioga | 115 min |
| Jun 16, 1:00 PM EDT | Mesoscale Discussion | SPC | Beaver, Lawrence, Mercer | 90 min |
| Jun 16, 1:17 PM EDT | Mesoscale Discussion | SPC | Cameron, Crawford, Elk, Erie, Forest, McKean and 4 more | 118 min |
| Jun 16, 3:31 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 7 more | 89 min |
| Jun 16, 5:34 PM EDT | Mesoscale Discussion | SPC | Greene | 86 min |
| Jun 16, 6:05 PM EDT | Mesoscale Discussion | SPC | Cameron, Clinton, Lycoming | 55 min |
| Jun 22, 1:16 PM EDT | Mesoscale Discussion | SPC | Adams, Blair, Cameron, Centre, Clinton, Cumberland and 15 more | 119 min |
| Jun 22, 2:24 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 10 more | 96 min |
| Jun 22, 3:56 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Cameron, Centre and 16 more | 94 min |
| Jun 22, 4:54 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Fayette, Greene, Indiana, Washington and 1 more | 96 min |
| Jun 22, 6:16 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Cameron, Centre and 12 more | 119 min |
| Jul 1, 11:59 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Cambria, Chester and 16 more | 3 hr |
| Jul 1, 3:38 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Chester, Cumberland, Dauphin, Delaware and 7 more | 2 hr |
| Jul 1, 8:35 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 31 more | 85 min |
| Jul 2, 12:45 PM EDT | Mesoscale Discussion | SPC | Lackawanna, Pike, Susquehanna, Wayne, Wyoming | 2 hr |
| Jul 2, 1:16 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Montgomery and 2 more | 119 min |
| Jul 2, 4:25 PM EDT | Mesoscale Discussion | SPC | Lackawanna, Pike, Wayne | 2 hr |
| Jul 2, 4:47 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Chester, Delaware, Lancaster and 3 more | 118 min |
| Jul 12, 11:40 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Cambria and 37 more | 2 hr |
| Jul 12, 4:02 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 17 more | 88 min |
| Jul 18, 12:18 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 20 more | 117 min |
| Jul 18, 4:32 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Cumberland and 17 more | 88 min |
| Jul 18, 6:38 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 6 more | 97 min |
| Jul 20, 8:31 PM EDT | Mesoscale Discussion | SPC | Beaver, Butler, Lawrence, Mercer, Venango | 59 min |
| Jul 22, 12:50 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 36 more | 115 min |
| Jul 23, 1:44 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Fayette and 6 more | 2 hr |
| Jul 23, 3:37 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Bedford, Blair, Cambria, Fayette and 7 more | 113 min |
| Jul 23, 7:04 PM EDT | Mesoscale Discussion | SPC | Adams, Cumberland, York | 116 min |
| Jul 24, 1:10 PM EDT | Mesoscale Discussion | SPC | Armstrong, Bradford, Butler, Cameron, Clarion, Clearfield and 14 more | 2 hr |
| Jul 24, 4:05 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Clinton, Lycoming, Potter, Sullivan and 3 more | 115 min |
| Jul 25, 12:27 AM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Warren | 93 min |
| Jul 25, 12:52 AM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Crawford, Elk, Forest, Lycoming and 8 more | 113 min |
| Jul 25, 3:54 AM EDT | Mesoscale Discussion | SPC | Armstrong, Cameron, Clearfield, Elk, Jefferson, Tioga | 96 min |
| Jul 25, 11:25 AM EDT | Mesoscale Discussion | SPC | Northampton | 95 min |
| Jul 25, 1:02 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Philadelphia | 118 min |
| Jul 28, 3:32 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Dauphin and 15 more | 118 min |
| Aug 4, 12:19 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Centre, Clinton, Elk, Lycoming and 6 more | 116 min |
| Aug 4, 12:58 PM EDT | Mesoscale Discussion | SPC | Beaver, Butler, Clarion, Lawrence, Mercer, Venango | 2 hr |
| Aug 4, 3:27 PM EDT | Mesoscale Discussion | SPC | Carbon, Columbia, Cumberland, Dauphin, Lackawanna, Lebanon and 12 more | 2 hr |
| Aug 8, 7:29 PM EDT | Mesoscale Discussion | SPC | Crawford, Mercer | 61 min |
| Aug 9, 12:43 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 7 more | 2 hr |
| Aug 20, 5:49 PM EDT | Mesoscale Discussion | SPC | Beaver, Crawford, Lawrence, Mercer, Washington | 86 min |
| Aug 22, 4:10 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 15 more | 3 hr |
| Aug 30, 1:01 PM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Bucks, Carbon, Chester, Columbia and 20 more | 119 min |
| Aug 30, 5:50 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 4 more | 115 min |
| Sep 12, 5:46 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Lehigh and 3 more | 119 min |
| Sep 21, 1:31 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Forest, Lawrence, Mercer, Venango and 1 more | 119 min |
| Sep 25, 10:23 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Cumberland, Franklin, Fulton, Huntingdon and 1 more | 2 hr |
| Sep 25, 2:35 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Montgomery, Philadelphia | 115 min |
| Sep 25, 2:51 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Blair, Butler, Cambria, Centre and 10 more | 84 min |
| Oct 13, 12:57 PM EDT | Mesoscale Discussion | SPC | Adams, Bradford, Clinton, Columbia, Cumberland, Dauphin and 15 more | 2 hr |
| Nov 17, 2:09 AM EST | Mesoscale Discussion | SPC | Crawford, Erie | 5 hr |
| Nov 18, 1:53 PM EST | Mesoscale Discussion | SPC | Allegheny, Fayette, Greene, Washington, Westmoreland | 4 hr |
| Nov 18, 5:41 PM EST | Mesoscale Discussion | SPC | Berks, Carbon, Columbia, Dauphin, Lackawanna, Lebanon and 8 more | 2 hr |
| Nov 19, 8:25 PM EST | Mesoscale Discussion | SPC | Crawford, Erie, Forest, McKean, Mercer, Venango and 1 more | 6 hr |
| Nov 27, 12:19 PM EST | Mesoscale Discussion | SPC | Allegheny, Fayette, Greene, Somerset, Washington, Westmoreland | 116 min |
| Dec 15, 12:11 AM EST | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Fulton, Huntingdon, Somerset | 6 hr |
| Dec 15, 3:27 AM EST | Mesoscale Discussion | SPC | Adams, Blair, Cameron, Centre, Clearfield, Clinton and 20 more | 5 hr |
| Dec 15, 11:24 AM EST | Mesoscale Discussion | SPC | Berks, Bradford, Cameron, Carbon, Centre, Clinton and 24 more | 4 hr |
| Dec 15, 4:56 PM EST | Mesoscale Discussion | SPC | Carbon, Columbia, Lackawanna, Luzerne, Monroe, Pike and 3 more | 4 hr |
| Dec 23, 7:49 AM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 20 more | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Dauphin County38
- Chester County36
- Clinton County35
- Monroe County35
- Delaware County34
- Carbon County34
- Northampton County34
- Adams County34
- Berks County34
- Montgomery County33
- Pike County33
- Cumberland County33
- York County33
- Cameron County32
- Lackawanna County32
- Luzerne County32
- Lycoming County32
- Northumberland County32
- Wayne County32
- Lebanon County32
- Lancaster County32
- Philadelphia County31
- Tioga County31
- Columbia County31
- Montour County31
- Perry County31
- Snyder County31
- Lehigh County31
- Bucks County30
- Susquehanna County30
- Wyoming County29
- Elk County28
- Sullivan County28
- Union County28
- Schuylkill County28
- Juniata County27
- Beaver County27
- Potter County26
- Venango County26
- Lawrence County26
27 more counties
- Mercer County26
- Clearfield County25
- Crawford County25
- Huntingdon County25
- Franklin County25
- Washington County25
- Warren County24
- Bradford County24
- Centre County24
- Forest County23
- McKean County23
- Allegheny County23
- Butler County23
- Blair County22
- Mifflin County22
- Fulton County22
- Armstrong County22
- Greene County22
- Cambria County21
- Westmoreland County21
- Jefferson County20
- Indiana County20
- Clarion County19
- Bedford County17
- Somerset County17
- Erie County16
- Fayette County16
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20212023
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.