Alert archive / Pennsylvania / Mesoscale Discussions

Mesoscale Discussions in Pennsylvania, 2021

143 mesoscale discussions in 2021. 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 2021. Tap one for its archive.

Mesoscale Discussions
143
Busiest month
July40 mesoscale discussions
Busiest day
June 30, 20216 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 26, 8:46 AM ESTMesoscale DiscussionSPCBedford, Blair, Cambria, Cameron, Centre, Clearfield and 15 more4 hr
Feb 1, 7:13 AM ESTMesoscale DiscussionSPCCarbon, Lehigh, Monroe, Northampton, Pike6 hr
Feb 1, 1:43 PM ESTMesoscale DiscussionSPCBucks, Chester, Delaware, Lehigh, Montgomery, Northampton and 1 more6 hr
Feb 1, 7:27 PM ESTMesoscale DiscussionSPCPike6 hr
Feb 13, 10:02 AM ESTMesoscale DiscussionSPCDelaware, Philadelphia6 hr
Feb 15, 2:44 PM ESTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Butler and 18 more6 hr
Feb 15, 8:06 PM ESTMesoscale DiscussionSPCErie, Warren5 hr
Feb 15, 9:16 PM ESTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Blair, Bradford, Butler and 34 more5 hr
Feb 18, 9:47 AM ESTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Lehigh and 4 more4 hr
Feb 22, 7:48 AM ESTMesoscale DiscussionSPCAdams, Berks, Bucks, Carbon, Chester, Columbia and 24 more4 hr
Mar 28, 7:05 PM EDTMesoscale DiscussionSPCBucks, Delaware, Montgomery, Philadelphia115 min
Apr 11, 4:54 PM EDTMesoscale DiscussionSPCAdams, Cumberland, Dauphin, Franklin, Juniata, Lancaster and 3 more2 hr
Apr 21, 11:49 AM EDTMesoscale DiscussionSPCBucks, Delaware, Philadelphia2 hr
Apr 28, 1:06 PM EDTMesoscale DiscussionSPCBradford, Cameron, Centre, Clarion, Clearfield, Clinton and 12 more114 min
May 3, 2:47 PM EDTMesoscale DiscussionSPCFayette, Greene, Washington118 min
May 4, 3:28 PM EDTMesoscale DiscussionSPCBradford, Cameron, Clarion, Clearfield, Clinton, Columbia and 14 more62 min
May 5, 1:03 PM EDTMesoscale DiscussionSPCLancaster2 hr
May 23, 1:20 PM EDTMesoscale DiscussionSPCBerks, Bradford, Cameron, Carbon, Centre, Clearfield and 27 more115 min
May 26, 12:16 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Blair, Bradford, Butler and 39 more119 min
May 26, 4:41 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lackawanna and 12 more64 min
May 26, 6:34 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia116 min
Jun 3, 1:46 PM EDTMesoscale DiscussionSPCAdams, Chester, Delaware, Lancaster, Montgomery, Philadelphia and 1 more119 min
Jun 3, 4:47 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Lehigh and 4 more88 min
Jun 4, 2:26 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Lehigh and 5 more94 min
Jun 4, 4:12 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia93 min
Jun 13, 12:13 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Butler, Cambria and 8 more2 hr
Jun 13, 2:38 PM EDTMesoscale DiscussionSPCBlair, Bradford, Cambria, Cameron, Centre, Clearfield and 20 more2 hr
Jun 13, 3:26 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 10 more94 min
Jun 13, 4:56 PM EDTMesoscale DiscussionSPCBlair, Bradford, Cambria, Cameron, Centre, Clarion and 25 more94 min
Jun 13, 7:21 PM EDTMesoscale DiscussionSPCBlair, Bradford, Cambria, Cameron, Carbon, Centre and 20 more84 min
Jun 14, 11:31 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Butler and 22 more89 min
Jun 14, 1:40 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Carbon, Chester, Columbia and 15 more3 hr
Jun 14, 2:48 PM EDTMesoscale DiscussionSPCSusquehanna2 hr
Jun 14, 3:25 PM EDTMesoscale DiscussionSPCFayette, Greene, Somerset, Washington, Westmoreland95 min
Jun 14, 6:18 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Lehigh and 3 more117 min
Jun 19, 7:07 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Lawrence, Mercer and 2 more83 min
Jun 21, 11:59 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 12 more91 min
Jun 21, 1:51 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Bradford, Bucks and 37 more114 min
Jun 21, 3:47 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Cambria, Cameron, Clearfield, Elk and 6 more58 min
Jun 21, 6:15 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Lancaster, Montgomery, Philadelphia60 min
Jun 21, 6:50 PM EDTMesoscale DiscussionSPCBradford, Carbon, Columbia, Lackawanna, Luzerne, Monroe and 6 more55 min
Jun 29, 2:33 PM EDTMesoscale DiscussionSPCButler, Cameron, Clarion, Crawford, Elk, Erie and 8 more117 min
Jun 30, 11:30 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Blair, Butler, Cambria and 23 more2 hr
Jun 30, 2:16 PM EDTMesoscale DiscussionSPCCarbon, Lackawanna, Luzerne, Monroe, Pike, Wayne and 1 more119 min
Jun 30, 3:29 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Bedford, Blair, Cambria, Centre and 16 more2 hr
Jun 30, 4:41 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Columbia, Cumberland and 17 more2 hr
Jun 30, 4:48 PM EDTMesoscale DiscussionSPCLackawanna, Susquehanna, Wayne87 min
Jun 30, 6:58 PM EDTMesoscale DiscussionSPCAdams, Berks, Lancaster, Lebanon, Lehigh, Northampton and 1 more92 min
Jul 1, 11:45 AM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Lancaster, Montgomery, Philadelphia2 hr
Jul 1, 2:36 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia84 min
Jul 1, 4:16 PM EDTMesoscale DiscussionSPCDelaware, Philadelphia89 min
Jul 2, 3:13 PM EDTMesoscale DiscussionSPCBerks, Bradford, Bucks, Cameron, Carbon, Centre and 32 more92 min
Jul 6, 12:33 PM EDTMesoscale DiscussionSPCBerks, Bradford, Bucks, Carbon, Chester, Columbia and 23 more2 hr
Jul 6, 4:23 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Columbia, Dauphin and 16 more97 min
Jul 6, 5:25 PM EDTMesoscale DiscussionSPCCarbon, Monroe, Northampton95 min
Jul 7, 1:50 PM EDTMesoscale DiscussionSPCLackawanna, Monroe, Northampton, Pike, Wayne115 min
Jul 7, 3:59 PM EDTMesoscale DiscussionSPCCrawford, Erie91 min
Jul 7, 4:48 PM EDTMesoscale DiscussionSPCBerks, Bradford, Bucks, Carbon, Columbia, Lackawanna and 15 more87 min
Jul 7, 7:11 PM EDTMesoscale DiscussionSPCBradford, Cameron, Carbon, Centre, Clinton, Columbia and 16 more2 hr
Jul 8, 1:31 PM EDTMesoscale DiscussionSPCCrawford, Erie, Lawrence, Mercer, Venango, Warren2 hr
Jul 8, 1:44 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lancaster and 7 more3 hr
Jul 8, 4:36 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Dauphin, Delaware and 9 more114 min
Jul 9, 4:35 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Columbia, Cumberland and 24 more115 min
Jul 11, 2:05 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Butler and 15 more55 min
Jul 11, 5:41 PM EDTMesoscale DiscussionSPCBedford, Blair, Cambria, Centre, Clearfield, Clinton and 12 more94 min
Jul 11, 8:58 PM EDTMesoscale DiscussionSPCAdams, Berks, Carbon, Columbia, Cumberland, Dauphin and 11 more62 min
Jul 12, 1:32 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Bucks, Carbon and 26 more88 min
Jul 12, 7:25 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lancaster and 6 more2 hr
Jul 13, 12:48 PM EDTMesoscale DiscussionSPCArmstrong, Berks, Blair, Bradford, Cambria, Cameron and 36 more87 min
Jul 13, 4:07 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Bradford and 41 more113 min
Jul 13, 6:44 PM EDTMesoscale DiscussionSPCBlair, Bradford, Cambria, Cameron, Centre, Clearfield and 22 more91 min
Jul 13, 9:12 PM EDTMesoscale DiscussionSPCBradford, Carbon, Columbia, Juniata, Lackawanna, Luzerne and 10 more93 min
Jul 16, 5:51 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Columbia, Cumberland, Dauphin and 16 more114 min
Jul 17, 12:00 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Bradford, Bucks and 35 more3 hr
Jul 17, 3:02 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Lehigh and 3 more88 min
Jul 17, 4:38 PM EDTMesoscale DiscussionSPCAdams, Berks, Bradford, Bucks, Carbon, Chester and 31 more97 min
Jul 17, 6:54 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Carbon, Chester, Columbia and 22 more2 hr
Jul 17, 10:02 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia58 min
Jul 20, 10:01 PM EDTMesoscale DiscussionSPCBradford, Lackawanna, Potter, Sullivan, Susquehanna, Tioga and 2 more59 min
Jul 21, 10:32 AM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Lancaster, Montgomery, Philadelphia58 min
Jul 21, 2:39 PM EDTMesoscale DiscussionSPCChester, Delaware, Montgomery, Philadelphia2 hr
Jul 27, 2:01 PM EDTMesoscale DiscussionSPCSusquehanna89 min
Jul 27, 4:36 PM EDTMesoscale DiscussionSPCLackawanna, Pike, Susquehanna, Wayne, Wyoming84 min
Jul 27, 6:09 PM EDTMesoscale DiscussionSPCBradford, Lackawanna, Lycoming, Pike, Sullivan, Susquehanna and 3 more96 min
Jul 29, 1:21 PM EDTMesoscale DiscussionSPCAdams, Bedford, Blair, Cumberland, Dauphin, Franklin and 7 more114 min
Jul 29, 4:26 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lancaster and 7 more94 min
Jul 29, 6:34 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Fayette, Greene, Washington116 min
Jul 29, 7:09 PM EDTMesoscale DiscussionSPCPhiladelphia96 min
Aug 1, 12:27 PM EDTMesoscale DiscussionSPCBradford, Cameron, Clinton, Elk, Forest, Lackawanna and 10 more2 hr
Aug 10, 12:12 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Fayette, Greene and 2 more3 hr
Aug 10, 2:30 PM EDTMesoscale DiscussionSPCAdams, Berks, Bucks, Chester, Cumberland, Dauphin and 8 more3 hr
Aug 11, 9:31 AM EDTMesoscale DiscussionSPCLawrence, Mercer89 min
Aug 11, 11:50 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Cambria, Clarion and 12 more115 min
Aug 11, 2:03 PM EDTMesoscale DiscussionSPCAdams, Armstrong, Bedford, Berks, Blair, Bucks and 42 more87 min
Aug 11, 6:44 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lancaster and 6 more91 min
Aug 12, 11:03 AM EDTMesoscale DiscussionSPCSusquehanna2 hr
Aug 12, 12:19 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Blair, Butler, Cambria, Cameron and 20 more116 min
Aug 12, 3:17 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Butler, Crawford, Lawrence, Mercer and 1 more58 min
Aug 12, 6:22 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Blair, Butler, Cambria and 21 more83 min
Aug 12, 10:08 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Columbia, Cumberland and 22 more67 min
Aug 13, 12:33 PM EDTMesoscale DiscussionSPCAdams, Cumberland, Dauphin, Franklin, Fulton, Lancaster and 3 more87 min
Aug 13, 2:48 PM EDTMesoscale DiscussionSPCBradford, Cameron, Clinton, Lycoming, Potter, Sullivan and 2 more87 min
Aug 13, 4:48 PM EDTMesoscale DiscussionSPCChester87 min
Aug 13, 7:14 PM EDTMesoscale DiscussionSPCBradford, Columbia, Lackawanna, Luzerne, Lycoming, Monroe and 9 more61 min
Aug 13, 7:49 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Cambria, Clarion and 13 more56 min
Aug 18, 10:58 AM EDTMesoscale DiscussionSPCAdams, Armstrong, Bedford, Blair, Cambria, Cameron and 23 more92 min
Aug 18, 3:29 PM EDTMesoscale DiscussionSPCAdams, Berks, Blair, Carbon, Centre, Chester and 26 more91 min
Aug 18, 4:57 PM EDTMesoscale DiscussionSPCAdams, Berks, Chester, Columbia, Cumberland, Dauphin and 13 more93 min
Aug 19, 12:44 AM EDTMesoscale DiscussionSPCBucks, Delaware, Montgomery, Philadelphia61 min
Aug 27, 1:41 PM EDTMesoscale DiscussionSPCAdams, Cumberland, Franklin, Lancaster, York3 hr
Aug 28, 1:05 PM EDTMesoscale DiscussionSPCAdams, Bedford, Blair, Cambria, Cumberland, Franklin and 4 more115 min
Aug 29, 1:07 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 15 more83 min
Sep 1, 4:01 AM EDTMesoscale DiscussionSPCChester, Delaware, Lancaster, York119 min
Sep 1, 3:09 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia3 hr
Sep 1, 4:28 PM EDTMesoscale DiscussionSPCDelaware, Philadelphia2 hr
Sep 1, 6:34 PM EDTMesoscale DiscussionSPCPhiladelphia56 min
Sep 8, 4:15 PM EDTMesoscale DiscussionSPCBerks, Carbon, Chester, Columbia, Dauphin, Lackawanna and 12 more2 hr
Sep 8, 9:25 PM EDTMesoscale DiscussionSPCBerks, Bucks, Lehigh, Monroe, Montgomery, Northampton and 1 more95 min
Sep 8, 10:42 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Lehigh and 2 more2 hr
Sep 13, 12:26 AM EDTMesoscale DiscussionSPCSusquehanna94 min
Sep 13, 4:11 PM EDTMesoscale DiscussionSPCCameron, Clinton, Elk, Erie, Forest, McKean and 2 more2 hr
Sep 13, 7:07 PM EDTMesoscale DiscussionSPCCarbon, Centre, Clearfield, Columbia, Jefferson, Luzerne and 5 more113 min
Sep 15, 10:33 AM EDTMesoscale DiscussionSPCBedford, Berks, Blair, Bradford, Cambria, Carbon and 32 more2 hr
Sep 15, 4:38 PM EDTMesoscale DiscussionSPCBlair, Carbon, Centre, Columbia, Cumberland, Dauphin and 18 more67 min
Sep 15, 8:11 PM EDTMesoscale DiscussionSPCAdams, Berks, Carbon, Lancaster, Lebanon, Lehigh and 3 more2 hr
Sep 22, 1:08 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 8 more3 hr
Sep 22, 4:08 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 10 more97 min
Sep 22, 6:13 PM EDTMesoscale DiscussionSPCArmstrong, Butler, Clarion, Crawford, Erie, Forest and 5 more92 min
Sep 23, 3:13 AM EDTMesoscale DiscussionSPCAdams, Berks, Chester, Cumberland, Dauphin, Lancaster and 3 more5 hr
Sep 23, 10:30 AM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 3 more2 hr
Sep 23, 1:29 PM EDTMesoscale DiscussionSPCBucks, Northampton, Philadelphia61 min
Oct 4, 4:44 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Lancaster, Montgomery, Philadelphia and 1 more2 hr
Oct 15, 12:36 PM EDTMesoscale DiscussionSPCCameron, Centre, Clarion, Clearfield, Elk, Forest and 1 more84 min
Oct 15, 1:59 PM EDTMesoscale DiscussionSPCCrawford, Erie, Mercer91 min
Oct 16, 11:06 AM EDTMesoscale DiscussionSPCBerks, Bradford, Carbon, Columbia, Cumberland, Dauphin and 20 more114 min
Oct 16, 1:50 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lancaster and 4 more115 min
Oct 21, 2:39 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Butler, Clarion, Crawford, Erie and 6 more3 hr
Oct 21, 5:25 PM EDTMesoscale DiscussionSPCLawrence, Mercer2 hr
Oct 21, 7:56 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Butler, Cambria, Clarion, Clearfield and 6 more2 hr
Oct 25, 6:41 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Lancaster, Lehigh and 3 more2 hr
Nov 28, 6:02 PM ESTMesoscale DiscussionSPCErie, McKean, Warren5 hr
Dec 11, 7:29 PM ESTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lackawanna and 12 more3 hr
Dec 27, 6:58 AM ESTMesoscale DiscussionSPCBedford, Blair, Cambria, Cameron, Centre, Clarion and 10 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. June 30, 20216mesoscale discussions
  2. August 13, 20216mesoscale discussions
  3. June 13, 20215mesoscale discussions
  4. June 14, 20215mesoscale discussions
  5. June 21, 20215mesoscale discussions
  6. July 7, 20214mesoscale discussions
  7. July 17, 20214mesoscale discussions
  8. July 29, 20214mesoscale discussions
  9. August 11, 20214mesoscale discussions
  10. August 12, 20214mesoscale discussions
  11. September 1, 20214mesoscale discussions
  12. May 26, 20213mesoscale discussions

Nearby

Alerts in force nowTornadoes on recordThe radar archive20202022

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. Rebuilt daily.