Alert archive / Pennsylvania / Mesoscale Discussions

Mesoscale Discussions in Pennsylvania, 2025

126 mesoscale discussions in 2025. 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 2025. Tap one for its archive.

Mesoscale Discussions
126
Busiest month
June30 mesoscale discussions
Busiest day
May 16, 20256 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.

IssuedProductOfficeCountiesLasted
Jan 19, 1:00 PM ESTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Cambria, Chester and 19 more5 hr
Jan 19, 4:34 PM ESTMesoscale DiscussionSPCLehigh, Monroe, Northampton, Pike3 hr
Jan 29, 11:39 AM ESTMesoscale DiscussionSPCSusquehanna, Wayne2 hr
Feb 6, 4:00 AM ESTMesoscale DiscussionSPCAdams, Armstrong, Bedford, Berks, Blair, Bradford and 50 more5 hr
Feb 8, 3:42 PM ESTMesoscale DiscussionSPCAdams, Bedford, Blair, Cambria, Cameron, Centre and 29 more4 hr
Feb 8, 6:21 PM ESTMesoscale DiscussionSPCBradford, Susquehanna, Tioga, Wayne4 hr
Feb 8, 6:24 PM ESTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lackawanna and 10 more4 hr
Feb 15, 12:50 PM ESTMesoscale DiscussionSPCAdams, Bedford, Blair, Cambria, Cumberland, Fayette and 8 more4 hr
Mar 5, 2:19 PM ESTMesoscale DiscussionSPCAllegheny, Armstrong, Bedford, Blair, Butler, Cambria and 18 more116 min
Mar 16, 10:04 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 12 more86 min
Mar 16, 12:08 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Butler and 27 more97 min
Mar 16, 2:07 PM EDTMesoscale DiscussionSPCAdams, Bedford, Blair, Bradford, Cambria, Cameron and 28 more53 min
Mar 16, 4:26 PM EDTMesoscale DiscussionSPCAdams, Berks, Carbon, Columbia, Cumberland, Dauphin and 15 more94 min
Mar 16, 6:20 PM EDTMesoscale DiscussionSPCLackawanna, Luzerne, Monroe, Pike, Susquehanna, Wayne and 1 more115 min
Mar 31, 3:33 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Carbon, Chester, Cumberland and 12 more117 min
Apr 3, 12:05 AM EDTMesoscale DiscussionSPCAllegheny, Beaver, Washington115 min
Apr 3, 4:54 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Butler, Clarion, Fayette, Greene and 4 more96 min
Apr 14, 2:18 PM EDTMesoscale DiscussionSPCFayette, Greene117 min
Apr 15, 12:08 PM EDTMesoscale DiscussionSPCBradford, Cameron, Clinton, Elk, Jefferson, Lycoming and 7 more3 hr
Apr 19, 1:16 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Cameron, Centre and 17 more119 min
Apr 19, 6:20 PM EDTMesoscale DiscussionSPCAllegheny, Bedford, Blair, Cambria, Fayette, Franklin and 8 more85 min
Apr 19, 10:43 PM EDTMesoscale DiscussionSPCYork92 min
Apr 21, 12:47 PM EDTMesoscale DiscussionSPCBeaver, Butler, Crawford, Erie, Forest, Lawrence and 3 more2 hr
Apr 29, 12:01 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Butler, Lawrence, Washington89 min
Apr 29, 2:41 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 17 more2 hr
Apr 29, 6:10 PM EDTMesoscale DiscussionSPCBedford, Blair, Cambria, Centre, Clearfield, Franklin and 5 more95 min
May 1, 12:12 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Butler, Greene, Lawrence, Washington2 hr
May 1, 2:43 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 8 more92 min
May 1, 4:22 PM EDTMesoscale DiscussionSPCBedford, Franklin, Fulton83 min
May 1, 10:06 PM EDTMesoscale DiscussionSPCBedford, Blair, Cambria, Centre, Clearfield, Clinton and 6 more114 min
May 2, 11:43 AM EDTMesoscale DiscussionSPCBeaver, Butler, Crawford, Lawrence, Mercer, Venango2 hr
May 2, 2:58 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 4 more2 hr
May 2, 5:42 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bradford, Butler, Cameron and 24 more2 hr
May 3, 2:50 PM EDTMesoscale DiscussionSPCAdams, Berks, Chester, Cumberland, Dauphin, Franklin and 5 more115 min
May 3, 6:46 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Montgomery and 2 more59 min
May 4, 2:34 PM EDTMesoscale DiscussionSPCBeaver, Greene, Washington2 hr
May 4, 7:12 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Butler, Cambria, Clarion, Fayette and 5 more2 hr
May 5, 1:02 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 8 more118 min
May 5, 2:16 PM EDTMesoscale DiscussionSPCAdams, Bedford, Franklin, Fulton, Somerset119 min
May 5, 5:29 PM EDTMesoscale DiscussionSPCFranklin, Fulton2 hr
May 5, 8:11 PM EDTMesoscale DiscussionSPCAdams, Allegheny, Armstrong, Beaver, Bedford, Blair and 10 more2 hr
May 6, 12:01 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Columbia, Delaware and 15 more119 min
May 6, 2:43 PM EDTMesoscale DiscussionSPCBerks, Bradford, Bucks, Carbon, Chester, Columbia and 20 more92 min
May 6, 4:37 PM EDTMesoscale DiscussionSPCBerks, Bradford, Bucks, Carbon, Columbia, Dauphin and 15 more83 min
May 6, 5:57 PM EDTMesoscale DiscussionSPCMonroe, Pike, Wayne2 hr
May 16, 4:36 AM EDTMesoscale DiscussionSPCArmstrong, Butler, Clarion, Crawford, Elk, Erie and 7 more84 min
May 16, 4:38 AM EDTMesoscale DiscussionSPCArmstrong, Butler, Clarion, Crawford, Elk, Erie and 7 more97 min
May 16, 9:46 AM EDTMesoscale DiscussionSPCBerks, Chester, Delaware, Lancaster, Lebanon, Montgomery and 1 more119 min
May 16, 12:11 PM EDTMesoscale DiscussionSPCBucks, Delaware, Philadelphia2 hr
May 16, 1:41 PM EDTMesoscale DiscussionSPCAdams, Bedford, Blair, Cambria, Fayette, Franklin and 7 more3 hr
May 16, 4:14 PM EDTMesoscale DiscussionSPCAdams, Armstrong, Bedford, Blair, Cambria, Centre and 10 more2 hr
May 21, 1:46 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Fayette, Greene, Lawrence, Washington2 hr
May 30, 8:37 PM EDTMesoscale DiscussionSPCChester, Delaware, Lancaster, Montgomery, Philadelphia113 min
Jun 5, 1:50 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bradford, Butler, Cambria and 20 more115 min
Jun 5, 4:20 PM EDTMesoscale DiscussionSPCFayette, Greene, Washington115 min
Jun 5, 5:32 PM EDTMesoscale DiscussionSPCArmstrong, Blair, Bradford, Cambria, Cameron, Centre and 19 more88 min
Jun 5, 8:14 PM EDTMesoscale DiscussionSPCBradford, Susquehanna91 min
Jun 9, 2:06 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 18 more84 min
Jun 9, 4:51 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Butler, Clarion, Crawford, Forest and 5 more54 min
Jun 9, 7:14 PM EDTMesoscale DiscussionSPCCameron, Centre, Clearfield, Clinton, Elk, Jefferson and 2 more91 min
Jun 12, 4:57 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Clinton, Columbia, Lackawanna and 13 more2 hr
Jun 18, 11:36 AM EDTMesoscale DiscussionSPCChester, Delaware, Lancaster, Philadelphia114 min
Jun 18, 2:52 PM EDTMesoscale DiscussionSPCChester, Delaware, Lancaster, Montgomery, Philadelphia, York113 min
Jun 18, 6:03 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 11 more87 min
Jun 18, 7:48 PM EDTMesoscale DiscussionSPCBeaver, Butler, Lawrence, Mercer, Washington57 min
Jun 18, 9:18 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Butler, Greene, Lawrence, Mercer and 1 more87 min
Jun 19, 12:44 PM EDTMesoscale DiscussionSPCBradford, Carbon, Lackawanna, Luzerne, Monroe, Pike and 4 more91 min
Jun 19, 1:22 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Chester, Cumberland, Dauphin and 13 more113 min
Jun 19, 2:17 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Fayette, Greene, Lawrence, Washington and 1 more118 min
Jun 19, 3:22 PM EDTMesoscale DiscussionSPCAdams, Chester, Delaware, Lancaster, Montgomery, Philadelphia and 1 more113 min
Jun 19, 5:25 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia2 hr
Jun 24, 4:49 PM EDTMesoscale DiscussionSPCCrawford, Forest, McKean, Mercer, Venango, Warren2 hr
Jun 25, 1:22 PM EDTMesoscale DiscussionSPCAdams, York113 min
Jun 25, 2:22 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Butler and 12 more113 min
Jun 26, 1:54 PM EDTMesoscale DiscussionSPCAdams, Berks, Carbon, Chester, Columbia, Cumberland and 17 more2 hr
Jun 26, 2:07 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 8 more113 min
Jun 26, 6:55 PM EDTMesoscale DiscussionSPCChester, Delaware, Lancaster, Philadelphia95 min
Jun 27, 12:47 PM EDTMesoscale DiscussionSPCArmstrong, Beaver, Butler, Clarion, Crawford, Erie and 5 more118 min
Jun 28, 10:51 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Berks, Blair and 45 more114 min
Jun 28, 2:14 PM EDTMesoscale DiscussionSPCGreene, Washington91 min
Jun 28, 2:33 PM EDTMesoscale DiscussionSPCBedford, Blair, Bradford, Cambria, Centre, Clearfield and 26 more87 min
Jun 28, 4:40 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Cambria, Carbon and 33 more95 min
Jun 30, 12:07 PM EDTMesoscale DiscussionSPCAdams, Armstrong, Bedford, Berks, Blair, Cambria and 35 more113 min
Jul 1, 11:48 AM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Bucks, Chester and 15 more117 min
Jul 1, 12:28 PM EDTMesoscale DiscussionSPCBradford, Susquehanna, Wayne2 hr
Jul 1, 3:02 PM EDTMesoscale DiscussionSPCChester, Dauphin, Delaware, Lancaster, Lebanon, Montgomery and 2 more118 min
Jul 1, 5:56 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia2 hr
Jul 3, 12:57 PM EDTMesoscale DiscussionSPCBradford, Lackawanna, Luzerne, Monroe, Pike, Sullivan and 3 more2 hr
Jul 3, 3:57 PM EDTMesoscale DiscussionSPCLackawanna, Monroe, Northampton, Pike2 hr
Jul 7, 2:04 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bradford, Butler, Cameron and 19 more2 hr
Jul 8, 12:34 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Carbon, Chester, Delaware and 9 more116 min
Jul 8, 3:32 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Lebanon and 5 more118 min
Jul 8, 6:46 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lancaster and 6 more119 min
Jul 9, 12:49 PM EDTMesoscale DiscussionSPCAdams, Bedford, Chester, Cumberland, Dauphin, Delaware and 7 more116 min
Jul 9, 4:43 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Chester, Delaware, Lancaster and 4 more2 hr
Jul 9, 8:35 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia115 min
Jul 10, 12:51 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bradford, Butler, Cameron and 15 more114 min
Jul 13, 1:23 PM EDTMesoscale DiscussionSPCBedford, Blair, Bradford, Cambria, Cameron, Centre and 20 more3 hr
Jul 14, 1:20 PM EDTMesoscale DiscussionSPCBradford, Lackawanna, Monroe, Pike, Sullivan, Susquehanna and 2 more2 hr
Jul 14, 2:20 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Carbon, Chester, Cumberland and 11 more2 hr
Jul 20, 2:01 PM EDTMesoscale DiscussionSPCCarbon, Lackawanna, Monroe, Northampton, Pike, Susquehanna and 2 more119 min
Jul 25, 1:05 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Delaware, Lackawanna, Lehigh and 7 more85 min
Jul 25, 4:29 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia91 min
Jul 25, 7:09 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Chester, Cumberland, Dauphin and 11 more96 min
Jul 26, 1:51 PM EDTMesoscale DiscussionSPCAdams, Cumberland, Franklin, Fulton, Lancaster, Perry and 1 more2 hr
Jul 26, 7:00 PM EDTMesoscale DiscussionSPCAdams, Armstrong, Bedford, Blair, Cambria, Centre and 14 more90 min
Jul 31, 11:29 AM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Dauphin, Delaware, Lancaster and 6 more3 hr
Jul 31, 4:02 PM EDTMesoscale DiscussionSPCAdams, Chester, Delaware, Franklin, Philadelphia, York118 min
Aug 13, 12:42 PM EDTMesoscale DiscussionSPCNorthampton, Pike2 hr
Aug 17, 12:39 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Bedford, Blair, Cambria, Fayette and 7 more66 min
Aug 17, 3:25 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Chester, Cumberland, Dauphin and 9 more2 hr
Aug 17, 6:28 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Montgomery and 2 more62 min
Aug 24, 1:04 PM EDTMesoscale DiscussionSPCBedford, Blair, Bradford, Cambria, Cameron, Centre and 10 more116 min
Sep 4, 10:44 AM EDTMesoscale DiscussionSPCCameron, Elk, McKean, Potter2 hr
Sep 5, 6:01 PM EDTMesoscale DiscussionSPCFayette, Greene, Washington119 min
Sep 6, 11:56 AM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Lehigh and 5 more94 min
Sep 25, 3:22 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Carbon, Chester, Columbia and 17 more113 min
Oct 19, 7:59 PM EDTMesoscale DiscussionSPCAdams, Centre, Cumberland, Dauphin, Juniata, Lebanon and 7 more3 hr
Oct 30, 3:16 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Montgomery and 1 more119 min
Nov 15, 6:14 PM ESTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 13 more3 hr
Dec 2, 4:54 AM ESTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 9 more4 hr
Dec 2, 9:51 AM ESTMesoscale DiscussionSPCBerks, Bucks, Carbon, Columbia, Cumberland, Dauphin and 19 more3 hr
Dec 26, 11:13 AM ESTMesoscale DiscussionSPCAdams, Armstrong, Bedford, Blair, Butler, Cambria and 25 more5 hr
Dec 26, 1:22 PM ESTMesoscale DiscussionSPCBradford, Lackawanna, Pike, Susquehanna, Wayne, Wyoming4 hr
Dec 29, 3:14 PM ESTMesoscale DiscussionSPCCrawford, Erie, Forest, McKean, Mercer, Venango and 1 more4 hr
Dec 31, 6:42 PM ESTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 13 more5 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

27 more counties

The busiest days

Days with the most alerts issued, by UTC date.

  1. May 16, 20256mesoscale discussions
  2. June 19, 20256mesoscale discussions
  3. March 16, 20255mesoscale discussions
  4. May 6, 20255mesoscale discussions
  5. May 2, 20254mesoscale discussions
  6. June 18, 20254mesoscale discussions
  7. June 28, 20254mesoscale discussions
  8. July 1, 20254mesoscale discussions
  9. February 8, 20253mesoscale discussions
  10. April 29, 20253mesoscale discussions
  11. May 1, 20253mesoscale discussions
  12. May 5, 20253mesoscale discussions

Nearby

Alerts in force nowTornadoes on recordThe radar archive20242026

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.