Alert archive / Pennsylvania / Mesoscale Discussions
Mesoscale Discussions in Pennsylvania, 2024
115 mesoscale discussions in 2024. 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 2024. Tap one for its archive.
- Mesoscale Discussions
- 115
- Busiest month
- June27 mesoscale discussions
- Busiest day
- June 14, 20245 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 6, 11:47 AM EST | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Centre, Cumberland and 17 more | 5 hr |
| Jan 6, 4:27 PM EST | Mesoscale Discussion | SPC | Berks, Bradford, Bucks, Cameron, Carbon, Centre and 31 more | 5 hr |
| Jan 14, 8:25 AM EST | Mesoscale Discussion | SPC | Blair, Bradford, Cambria, Cameron, Carbon, Centre and 27 more | 4 hr |
| Jan 14, 11:49 AM EST | Mesoscale Discussion | SPC | Monroe, Northampton, Pike, Wayne | 4 hr |
| Jan 16, 8:49 AM EST | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Feb 16, 7:40 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 10 more | 4 hr |
| Feb 16, 10:33 PM EST | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bucks, Carbon and 24 more | 4 hr |
| Feb 17, 11:34 AM EST | Mesoscale Discussion | SPC | Armstrong, Blair, Bradford, Butler, Cambria, Cameron and 34 more | 5 hr |
| Feb 28, 8:15 AM EST | Mesoscale Discussion | SPC | Fayette, Greene, Somerset | 2 hr |
| Mar 10, 12:13 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 28 more | 4 hr |
| Mar 30, 7:09 PM EDT | Mesoscale Discussion | SPC | Greene | 96 min |
| Apr 2, 8:42 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Greene, Washington | 93 min |
| Apr 11, 6:43 PM EDT | Mesoscale Discussion | SPC | Greene | 2 hr |
| Apr 14, 3:29 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 38 more | 2 hr |
| Apr 14, 6:46 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 20 more | 89 min |
| Apr 14, 9:34 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 11 more | 86 min |
| Apr 17, 2:12 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Crawford, Lawrence, Mercer and 1 more | 93 min |
| Apr 17, 6:23 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 10 more | 97 min |
| Apr 30, 1:12 PM EDT | Mesoscale Discussion | SPC | Bradford, Columbia, Lackawanna, Luzerne, Lycoming, Montour and 6 more | 3 hr |
| May 5, 1:12 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 6 more | 3 hr |
| May 8, 2:26 AM EDT | Mesoscale Discussion | SPC | Allegheny, Fayette, Greene, Washington, Westmoreland | 2 hr |
| May 11, 2:37 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Greene, Lawrence, Mercer and 1 more | 113 min |
| May 22, 12:28 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 22 more | 2 hr |
| May 22, 4:39 PM EDT | Mesoscale Discussion | SPC | Adams, Blair, Bradford, Cameron, Centre, Clinton and 23 more | 2 hr |
| May 25, 11:39 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 17 more | 3 hr |
| May 26, 7:22 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 7 more | 83 min |
| May 26, 10:18 PM EDT | Mesoscale Discussion | SPC | Adams, Franklin, Fulton | 87 min |
| May 27, 11:53 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 29 more | 2 hr |
| May 27, 4:40 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 26 more | 95 min |
| May 27, 7:40 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Dauphin and 12 more | 2 hr |
| Jun 6, 12:58 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 13 more | 92 min |
| Jun 6, 4:18 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Philadelphia | 87 min |
| Jun 14, 12:17 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Bedford, Blair, Butler, Cambria and 17 more | 118 min |
| Jun 14, 1:55 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Greene, Lawrence, Washington | 2 hr |
| Jun 14, 2:34 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bucks, Carbon and 30 more | 116 min |
| Jun 14, 6:20 PM EDT | Mesoscale Discussion | SPC | Bucks, Philadelphia | 85 min |
| Jun 14, 6:36 PM EDT | Mesoscale Discussion | SPC | Allegheny, Fayette, Greene, Washington | 84 min |
| Jun 17, 1:28 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Lawrence, Mercer, Venango, Warren | 2 hr |
| Jun 17, 7:50 PM EDT | Mesoscale Discussion | SPC | Blair, Centre, Clinton, Cumberland, Dauphin, Huntingdon and 6 more | 55 min |
| Jun 18, 1:35 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 20 more | 85 min |
| Jun 18, 2:01 PM EDT | Mesoscale Discussion | SPC | Bradford, Columbia, Lackawanna, Luzerne, Lycoming, Montour and 5 more | 89 min |
| Jun 18, 4:24 PM EDT | Mesoscale Discussion | SPC | Crawford, Forest, McKean, Mercer, Venango, Warren | 96 min |
| Jun 20, 12:17 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Forest, Lawrence, McKean, Mercer and 3 more | 118 min |
| Jun 21, 11:38 AM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Bradford, Cambria, Cameron, Centre and 22 more | 2 hr |
| Jun 23, 1:42 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 23 more | 2 hr |
| Jun 23, 3:23 PM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Carbon, Columbia, Cumberland, Dauphin and 20 more | 2 hr |
| Jun 23, 7:20 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Bedford, Blair, Bradford, Cambria and 31 more | 115 min |
| Jun 26, 12:32 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 26 more | 2 hr |
| Jun 26, 4:02 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 23 more | 118 min |
| Jun 26, 4:35 PM EDT | Mesoscale Discussion | SPC | Allegheny, Fayette, Greene, Washington, Westmoreland | 115 min |
| Jun 26, 9:12 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Centre, Fayette, Fulton and 5 more | 63 min |
| Jun 29, 12:03 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 13 more | 117 min |
| Jun 29, 4:09 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Centre, Clinton and 18 more | 96 min |
| Jun 29, 6:38 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Lebanon and 6 more | 97 min |
| Jun 30, 9:55 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Dauphin and 18 more | 2 hr |
| Jun 30, 2:26 PM EDT | Mesoscale Discussion | SPC | Monroe, Northampton | 94 min |
| Jun 30, 5:41 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Lancaster, Montgomery, Philadelphia | 94 min |
| Jul 10, 12:52 PM EDT | Mesoscale Discussion | SPC | Adams, Cumberland, Franklin, Fulton, York | 113 min |
| Jul 10, 2:39 PM EDT | Mesoscale Discussion | SPC | Bradford, Clinton, Potter, Tioga | 2 hr |
| Jul 10, 4:22 PM EDT | Mesoscale Discussion | SPC | Adams, Cumberland, Franklin, York | 113 min |
| Jul 10, 4:53 PM EDT | Mesoscale Discussion | SPC | Bradford, Lycoming, Sullivan, Susquehanna | 97 min |
| Jul 10, 7:17 PM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Carbon, Columbia, Dauphin, Juniata and 19 more | 88 min |
| Jul 14, 12:56 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Lehigh and 3 more | 3 hr |
| Jul 14, 6:29 PM EDT | Mesoscale Discussion | SPC | Beaver, Crawford, Erie, Lawrence, Mercer | 2 hr |
| Jul 15, 11:52 AM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Centre, Clarion, Clearfield, Clinton and 12 more | 113 min |
| Jul 15, 3:41 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Chester, Cumberland, Dauphin, Lancaster and 2 more | 2 hr |
| Jul 15, 4:21 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Clearfield, Clinton, Elk, Lycoming and 3 more | 84 min |
| Jul 15, 5:36 PM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Lycoming, Sullivan, Susquehanna, Tioga and 2 more | 114 min |
| Jul 15, 7:54 PM EDT | Mesoscale Discussion | SPC | Lackawanna, Luzerne, Pike, Susquehanna, Wayne, Wyoming | 96 min |
| Jul 16, 10:33 AM EDT | Mesoscale Discussion | SPC | Bradford, Forest, McKean, Potter, Susquehanna, Tioga and 2 more | 117 min |
| Jul 16, 1:27 PM EDT | Mesoscale Discussion | SPC | Bradford, Susquehanna, Tioga | 93 min |
| Jul 16, 2:35 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 23 more | 115 min |
| Jul 16, 6:20 PM EDT | Mesoscale Discussion | SPC | Adams, Bucks, Chester, Delaware, Lancaster, Montgomery and 2 more | 115 min |
| Jul 16, 8:19 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Lancaster, Montgomery, Philadelphia | 116 min |
| Jul 17, 12:27 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Dauphin and 14 more | 2 hr |
| Jul 17, 3:50 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 20 more | 115 min |
| Jul 17, 7:11 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 8 more | 2 hr |
| Jul 24, 1:30 PM EDT | Mesoscale Discussion | SPC | Erie, McKean, Warren | 90 min |
| Jul 24, 5:02 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bradford, Butler, Cambria and 18 more | 88 min |
| Jul 30, 12:39 PM EDT | Mesoscale Discussion | SPC | Adams, Blair, Centre, Clinton, Columbia, Cumberland and 18 more | 2 hr |
| Aug 1, 2:53 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Chester, Dauphin, Delaware, Lancaster and 5 more | 2 hr |
| Aug 2, 3:45 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 60 min |
| Aug 3, 12:56 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Dauphin and 13 more | 94 min |
| Aug 3, 2:53 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Cumberland and 18 more | 67 min |
| Aug 5, 12:48 PM EDT | Mesoscale Discussion | SPC | Cameron, Clarion, Crawford, Elk, Erie, Forest and 8 more | 87 min |
| Aug 5, 4:59 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Clarion, Clinton, Crawford, Elk and 16 more | 91 min |
| Aug 6, 10:59 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 23 more | 91 min |
| Aug 6, 1:06 PM EDT | Mesoscale Discussion | SPC | Bucks, Carbon, Chester, Delaware, Lackawanna, Lehigh and 6 more | 84 min |
| Aug 6, 2:10 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 36 more | 95 min |
| Aug 6, 4:29 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Berks and 52 more | 61 min |
| Aug 6, 6:31 PM EDT | Mesoscale Discussion | SPC | Adams, Chester, Delaware, Lancaster, Montgomery, Philadelphia and 1 more | 89 min |
| Aug 8, 11:04 PM EDT | Mesoscale Discussion | SPC | Adams, Chester, Lancaster, York | 116 min |
| Aug 9, 4:38 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Chester, Cumberland, Dauphin, Franklin and 7 more | 3 hr |
| Aug 9, 10:26 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 27 more | 94 min |
| Aug 18, 1:09 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 30 more | 96 min |
| Aug 18, 4:30 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 26 more | 90 min |
| Aug 19, 2:25 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Lehigh, Monroe, Montgomery and 3 more | 2 hr |
| Aug 27, 6:11 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Mercer | 64 min |
| Aug 27, 8:39 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Mercer, Venango, Warren | 96 min |
| Aug 29, 1:20 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Cameron, Centre, Clearfield and 7 more | 115 min |
| Aug 29, 5:40 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Centre, Cumberland and 15 more | 95 min |
| Aug 31, 12:39 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Fayette, Greene and 4 more | 2 hr |
| Aug 31, 3:28 PM EDT | Mesoscale Discussion | SPC | Bedford, Fulton, Somerset | 2 hr |
| Sep 6, 3:18 PM EDT | Mesoscale Discussion | SPC | Beaver, Butler, Clarion, Crawford, Erie, Forest and 4 more | 117 min |
| Sep 21, 2:37 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Bedford, Blair, Cambria, Cameron and 22 more | 2 hr |
| Oct 6, 4:26 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 17 more | 94 min |
| Oct 6, 6:54 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 7 more | 2 hr |
| Oct 13, 4:58 PM EDT | Mesoscale Discussion | SPC | Armstrong, Blair, Cambria, Cameron, Centre, Clarion and 7 more | 2 hr |
| Nov 21, 11:23 PM EST | Mesoscale Discussion | SPC | Bradford, Lackawanna, Susquehanna, Wayne, Wyoming | 4 hr |
| Nov 22, 1:56 PM EST | Mesoscale Discussion | SPC | Cambria, Clearfield, Fayette, Indiana, Jefferson, Somerset and 1 more | 4 hr |
| Dec 5, 1:47 AM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 14 more | 4 hr |
| Dec 5, 9:50 AM EST | Mesoscale Discussion | SPC | Bradford, Lackawanna, McKean, Pike, Potter, Susquehanna and 3 more | 2 hr |
| Dec 12, 10:39 AM EST | Mesoscale Discussion | SPC | Erie | 3 hr |
| Dec 15, 10:30 AM EST | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Fulton, Somerset | 5 hr |
| Dec 31, 6:56 PM EST | Mesoscale Discussion | SPC | Delaware, Philadelphia | 2 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Lancaster County35
- Chester County34
- Schuylkill County33
- Dauphin County32
- Lebanon County32
- Allegheny County32
- Northumberland County31
- Union County31
- York County31
- Montgomery County31
- Delaware County31
- Philadelphia County31
- Adams County30
- Blair County30
- Juniata County30
- Mifflin County30
- Lycoming County30
- Mercer County30
- Indiana County29
- Bucks County29
- Lackawanna County29
- Luzerne County29
- Montour County29
- Washington County29
- Cambria County28
- Centre County28
- Perry County28
- Snyder County28
- Westmoreland County28
- Bradford County28
- Columbia County28
- Pike County28
- Beaver County28
- Butler County28
- Lawrence County28
- Berks County27
- Cameron County27
- Lehigh County27
- Northampton County27
- Susquehanna County27
27 more counties
- Wayne County27
- Wyoming County27
- Clearfield County27
- Jefferson County27
- Cumberland County26
- Huntingdon County26
- Clinton County26
- Elk County26
- Monroe County26
- Tioga County26
- Armstrong County26
- Clarion County26
- Venango County26
- Somerset County25
- Carbon County25
- Fayette County24
- Potter County24
- Sullivan County24
- Greene County24
- Crawford County24
- Forest County24
- Franklin County23
- McKean County22
- Warren County21
- Fulton County20
- Bedford County18
- Erie County15
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20232025
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.