Alert archive / Pennsylvania / Mesoscale Discussions
Mesoscale Discussions in Pennsylvania, 2023
108 mesoscale discussions in 2023. 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 2023. Tap one for its archive.
- Mesoscale Discussions
- 108
- Busiest month
- July37 mesoscale discussions
- Busiest day
- August 7, 202311 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 19, 4:49 PM EST | Mesoscale Discussion | SPC | Mercer | 86 min |
| Jan 22, 1:03 PM EST | Mesoscale Discussion | SPC | Crawford, Erie, Mercer, Venango, Warren | 117 min |
| Feb 2, 9:41 PM EST | Mesoscale Discussion | SPC | Crawford, McKean, Mercer, Venango, Warren | 3 hr |
| Feb 2, 10:39 PM EST | Mesoscale Discussion | SPC | Bradford, Cameron, Clearfield, Clinton, Elk, Forest and 9 more | 4 hr |
| Feb 21, 2:22 PM EST | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Chester, Cumberland, Dauphin and 11 more | 53 min |
| Mar 6, 6:51 PM EST | Mesoscale Discussion | SPC | Bradford, Cameron, Carbon, Clinton, Columbia, Elk and 13 more | 4 hr |
| Mar 25, 11:50 AM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Greene, Lawrence, Mercer and 1 more | 85 min |
| Mar 25, 2:07 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 10 more | 53 min |
| Mar 29, 5:05 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Elk, Erie, Forest, McKean and 3 more | 4 hr |
| Mar 29, 9:51 PM EDT | Mesoscale Discussion | SPC | Susquehanna, Wayne | 4 hr |
| Apr 1, 11:15 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 23 more | 3 hr |
| Apr 1, 2:02 PM EDT | Mesoscale Discussion | SPC | Armstrong, Bedford, Blair, Bradford, Cambria, Cameron and 30 more | 118 min |
| Apr 1, 4:37 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Northampton, Philadelphia | 113 min |
| Apr 1, 6:55 PM EDT | Mesoscale Discussion | SPC | Delaware, Philadelphia | 95 min |
| Apr 5, 6:46 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Indiana and 5 more | 89 min |
| Apr 22, 2:47 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Dauphin and 23 more | 118 min |
| Apr 22, 6:11 PM EDT | Mesoscale Discussion | SPC | Bucks, Delaware, Monroe, Montgomery, Northampton, Philadelphia | 64 min |
| Apr 22, 6:21 PM EDT | Mesoscale Discussion | SPC | Pike, Wayne | 54 min |
| Jun 3, 1:27 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 33 more | 2 hr |
| Jun 6, 1:10 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Columbia, Dauphin, Juniata and 17 more | 2 hr |
| Jun 12, 12:30 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 60 min |
| Jun 16, 10:50 AM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 55 min |
| Jun 16, 12:34 PM EDT | Mesoscale Discussion | SPC | Philadelphia | 26 min |
| Jun 16, 4:13 PM EDT | Mesoscale Discussion | SPC | Adams, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 1 more | 92 min |
| Jun 26, 9:37 AM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Bucks, Cameron, Carbon, Chester and 23 more | 83 min |
| Jun 26, 12:36 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Bradford, Bucks, Cameron and 39 more | 2 hr |
| Jun 26, 3:22 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 4 more | 113 min |
| Jun 26, 4:30 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Cumberland, Dauphin, Franklin, Fulton and 5 more | 90 min |
| Jun 26, 8:03 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 27 more | 87 min |
| Jun 26, 10:50 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Lehigh, Montgomery, Northampton and 1 more | 55 min |
| Jul 1, 1:54 PM EDT | Mesoscale Discussion | SPC | Armstrong, Bedford, Blair, Bradford, Cambria, Cameron and 29 more | 2 hr |
| Jul 2, 2:06 PM EDT | Mesoscale Discussion | SPC | Adams, York | 114 min |
| Jul 2, 3:24 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Centre, Clinton, Columbia and 24 more | 96 min |
| Jul 2, 7:42 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 93 min |
| Jul 2, 8:10 PM EDT | Mesoscale Discussion | SPC | Greene, Washington | 95 min |
| Jul 3, 1:07 PM EDT | Mesoscale Discussion | SPC | Carbon, Lackawanna, Lehigh, Luzerne, Monroe, Northampton and 5 more | 113 min |
| Jul 3, 4:22 PM EDT | Mesoscale Discussion | SPC | Carbon, Lackawanna, Luzerne, Monroe, Northampton, Pike and 3 more | 53 min |
| Jul 3, 4:49 PM EDT | Mesoscale Discussion | SPC | Adams, Bucks, Chester, Delaware, Lancaster, Lebanon and 3 more | 116 min |
| Jul 3, 8:29 PM EDT | Mesoscale Discussion | SPC | Delaware, Philadelphia | 91 min |
| Jul 9, 10:28 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 23 more | 92 min |
| Jul 9, 1:20 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 19 more | 85 min |
| Jul 9, 4:08 PM EDT | Mesoscale Discussion | SPC | Chester | 97 min |
| Jul 13, 11:58 AM EDT | Mesoscale Discussion | SPC | Susquehanna | 2 hr |
| Jul 13, 2:36 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Carbon, Columbia, Cumberland and 23 more | 2 hr |
| Jul 14, 2:02 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 21 more | 2 hr |
| Jul 15, 3:50 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Chester, Delaware, Franklin and 7 more | 2 hr |
| Jul 17, 1:53 PM EDT | Mesoscale Discussion | SPC | Allegheny, Fayette, Greene, Washington, Westmoreland | 3 hr |
| Jul 19, 4:48 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 21 more | 87 min |
| Jul 20, 2:15 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Mercer, Venango, Warren | 90 min |
| Jul 20, 4:56 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 16 more | 94 min |
| Jul 20, 10:07 PM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Bucks, Carbon, Centre, Clinton and 24 more | 113 min |
| Jul 21, 4:26 AM EDT | Mesoscale Discussion | SPC | Bucks, Delaware, Philadelphia | 94 min |
| Jul 24, 11:58 AM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Lycoming, Sullivan, Susquehanna, Wayne and 1 more | 2 hr |
| Jul 24, 2:56 PM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Lycoming, Sullivan, Susquehanna, Wayne and 1 more | 2 hr |
| Jul 24, 5:53 PM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Susquehanna, Wayne, Wyoming | 2 hr |
| Jul 25, 10:58 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 16 more | 2 hr |
| Jul 26, 4:35 PM EDT | Mesoscale Discussion | SPC | Erie | 85 min |
| Jul 27, 11:40 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 27 more | 2 hr |
| Jul 27, 3:16 PM EDT | Mesoscale Discussion | SPC | Fayette, Greene, Somerset | 119 min |
| Jul 27, 4:20 PM EDT | Mesoscale Discussion | SPC | Lackawanna, Pike, Wayne, Wyoming | 85 min |
| Jul 27, 4:46 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Bucks, Carbon, Chester and 25 more | 89 min |
| Jul 27, 6:07 PM EDT | Mesoscale Discussion | SPC | Carbon, Columbia, Lackawanna, Luzerne, Monroe, Montour and 3 more | 83 min |
| Jul 28, 4:12 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Clarion and 11 more | 93 min |
| Jul 28, 6:33 PM EDT | Mesoscale Discussion | SPC | Adams, Franklin, York | 87 min |
| Jul 29, 6:06 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 17 more | 114 min |
| Jul 29, 1:56 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 16 more | 64 min |
| Jul 29, 4:45 PM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Bucks, Carbon, Chester, Columbia and 17 more | 2 hr |
| Aug 4, 11:21 AM EDT | Mesoscale Discussion | SPC | Berks, Blair, Bradford, Cameron, Carbon, Centre and 30 more | 114 min |
| Aug 4, 2:49 PM EDT | Mesoscale Discussion | SPC | Columbia, Lackawanna, Luzerne, Montour, Northumberland, Schuylkill and 5 more | 116 min |
| Aug 4, 6:13 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 35 more | 2 hr |
| Aug 6, 8:03 PM EDT | Mesoscale Discussion | SPC | Erie | 57 min |
| Aug 7, 8:18 AM EDT | Mesoscale Discussion | SPC | Adams, Franklin, Lancaster, York | 117 min |
| Aug 7, 10:19 AM EDT | Mesoscale Discussion | SPC | Greene | 86 min |
| Aug 7, 12:14 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Centre, Cumberland, Franklin and 6 more | 2 hr |
| Aug 7, 12:39 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Clinton, Elk, Lycoming, McKean and 2 more | 2 hr |
| Aug 7, 1:03 PM EDT | Mesoscale Discussion | SPC | Greene | 87 min |
| Aug 7, 2:31 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 10 more | 59 min |
| Aug 7, 3:17 PM EDT | Mesoscale Discussion | SPC | Adams, Centre, Clinton, Columbia, Cumberland, Dauphin and 16 more | 88 min |
| Aug 7, 4:40 PM EDT | Mesoscale Discussion | SPC | Adams, Columbia, Cumberland, Dauphin, Franklin, Lancaster and 9 more | 95 min |
| Aug 7, 5:01 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 11 more | 89 min |
| Aug 7, 6:57 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Lehigh, Montgomery, Northampton and 1 more | 93 min |
| Aug 12, 11:37 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 7 more | 2 hr |
| Aug 12, 4:04 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 33 more | 116 min |
| Aug 12, 5:38 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 6 more | 2 hr |
| Aug 12, 7:31 PM EDT | Mesoscale Discussion | SPC | Bedford, Fayette, Greene, Somerset, Washington, Westmoreland | 89 min |
| Aug 12, 9:02 PM EDT | Mesoscale Discussion | SPC | Bucks, Carbon, Lehigh, Monroe, Montgomery, Northampton and 1 more | 88 min |
| Aug 12, 10:12 PM EDT | Mesoscale Discussion | SPC | Bedford, Fayette, Franklin, Fulton, Somerset | 93 min |
| Aug 15, 1:28 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware | 3 hr |
| Aug 15, 7:05 PM EDT | Mesoscale Discussion | SPC | Bradford, Columbia, Crawford, Erie, Lycoming, Montour and 5 more | 115 min |
| Aug 17, 11:04 PM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Carbon, Columbia, Cumberland, Dauphin and 19 more | 3 hr |
| Aug 18, 4:45 AM EDT | Mesoscale Discussion | SPC | Bucks | 3 hr |
| Aug 24, 9:33 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Forest, Lawrence, Mercer, Venango and 1 more | 87 min |
| Aug 24, 11:42 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Lawrence, Mercer | 2 hr |
| Aug 25, 2:02 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 18 more | 118 min |
| Sep 7, 11:58 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 35 more | 3 hr |
| Sep 7, 3:06 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Carbon, Columbia, Cumberland and 21 more | 84 min |
| Sep 7, 4:48 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 12 more | 87 min |
| Sep 7, 6:13 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Lackawanna, Lancaster and 6 more | 92 min |
| Sep 7, 7:51 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Lehigh and 3 more | 84 min |
| Sep 8, 2:46 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Bucks, Carbon, Chester and 28 more | 119 min |
| Sep 8, 4:52 PM EDT | Mesoscale Discussion | SPC | Bucks, Delaware, Montgomery, Northampton, Philadelphia, Pike | 83 min |
| Sep 8, 6:34 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Delaware and 10 more | 86 min |
| Sep 8, 10:31 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware | 59 min |
| Sep 9, 2:08 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 36 more | 3 hr |
| Sep 9, 6:06 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 32 more | 114 min |
| Sep 9, 8:08 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 32 more | 2 hr |
| Nov 28, 2:16 AM EST | Mesoscale Discussion | SPC | Crawford, Erie | 4 hr |
| Dec 3, 1:36 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 12 more | 114 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Bucks County44
- Northampton County44
- Montgomery County41
- Delaware County40
- Lehigh County40
- Chester County39
- Philadelphia County39
- Carbon County38
- Monroe County37
- Berks County36
- Schuylkill County36
- Columbia County36
- Wyoming County35
- Northumberland County35
- Luzerne County35
- Pike County35
- York County34
- Montour County34
- Lackawanna County34
- Lancaster County33
- Wayne County33
- Lebanon County32
- Adams County31
- Snyder County31
- Sullivan County30
- Susquehanna County30
- Dauphin County30
- Cumberland County29
- Perry County29
- Union County27
- Juniata County26
- Bradford County25
- Lycoming County25
- Franklin County24
- Mifflin County22
- Clinton County21
- Fulton County20
- Tioga County18
- Bedford County17
- Huntingdon County17
27 more counties
- Mercer County16
- Warren County16
- Centre County16
- Elk County15
- Venango County14
- McKean County14
- Cameron County14
- Forest County14
- Jefferson County14
- Westmoreland County14
- Potter County13
- Allegheny County13
- Greene County13
- Lawrence County13
- Washington County13
- Armstrong County13
- Clarion County13
- Crawford County12
- Erie County12
- Beaver County12
- Butler County12
- Indiana County12
- Blair County12
- Somerset County12
- Clearfield County11
- Cambria County10
- Fayette County10
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20222024
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.