Alert archive / Pennsylvania / Mesoscale Discussions
Mesoscale Discussions in Pennsylvania, 2003
133 mesoscale discussions in 2003. 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 2003. Tap one for its archive.
- Mesoscale Discussions
- 133
- Busiest month
- July41 mesoscale discussions
- Busiest day
- August 27, 20037 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 1, 7:58 AM EST | Mesoscale Discussion | SPC | Lawrence, Mercer | 4 hr |
| Jan 1, 12:02 PM EST | Mesoscale Discussion | SPC | Bradford, Erie, McKean, Potter, Susquehanna, Tioga and 1 more | 6 hr |
| Jan 3, 9:55 AM EST | Mesoscale Discussion | SPC | Berks, Lancaster, Lehigh, Northampton, York | 4 hr |
| Jan 3, 10:28 AM EST | Mesoscale Discussion | SPC | Bradford, Lackawanna, Luzerne, Lycoming, Pike, Sullivan and 4 more | 4 hr |
| Jan 3, 1:32 PM EST | Mesoscale Discussion | SPC | Susquehanna | 7 hr |
| Feb 14, 10:18 PM EST | Mesoscale Discussion | SPC | Greene | 6 hr |
| Feb 16, 12:12 AM EST | Mesoscale Discussion | SPC | Fayette, Greene, Somerset, Washington | 5 hr |
| Feb 16, 11:45 AM EST | Mesoscale Discussion | SPC | Adams, Delaware | 6 hr |
| Feb 16, 6:41 PM EST | Mesoscale Discussion | SPC | Allegheny, Beaver, Greene, Washington | 3 hr |
| Feb 16, 7:04 PM EST | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Chester, Cumberland and 14 more | 4 hr |
| Feb 16, 11:19 PM EST | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Bedford, Berks, Blair and 27 more | 6 hr |
| Feb 27, 3:19 PM EST | Mesoscale Discussion | SPC | Chester | 6 hr |
| Mar 5, 9:36 PM EST | Mesoscale Discussion | SPC | Greene, Washington | 6 hr |
| Mar 6, 5:18 AM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 9 more | 4 hr |
| Mar 6, 7:13 AM EST | Mesoscale Discussion | SPC | Bradford, Carbon, Columbia, Lackawanna, Luzerne, Lycoming and 8 more | 7 hr |
| Mar 13, 8:39 AM EST | Mesoscale Discussion | SPC | Bradford, Crawford, Erie, Forest, McKean, Potter and 3 more | 3 hr |
| Mar 13, 12:23 PM EST | Mesoscale Discussion | SPC | Bradford, Carbon, Columbia, Lackawanna, Luzerne, Lycoming and 9 more | 4 hr |
| Mar 21, 12:18 PM EST | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Cameron, Centre, Clearfield and 9 more | 117 min |
| Mar 21, 2:05 PM EST | Mesoscale Discussion | SPC | York | 2 hr |
| Mar 29, 12:01 PM EST | Mesoscale Discussion | SPC | Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon and 2 more | 89 min |
| Mar 30, 10:10 AM EST | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Centre, Clinton, Cumberland and 9 more | 3 hr |
| Apr 4, 11:38 PM EST | Mesoscale Discussion | SPC | Beaver, Washington | 97 min |
| Apr 5, 2:34 AM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clearfield, Greene and 4 more | 86 min |
| Apr 7, 4:56 AM EDT | Mesoscale Discussion | SPC | Blair, Cambria, Cameron, Centre, Clarion, Clearfield and 13 more | 8 hr |
| Apr 7, 4:41 PM EDT | Mesoscale Discussion | SPC | Carbon, Columbia, Lehigh, Luzerne, Lycoming, Monroe and 6 more | 2 hr |
| May 1, 12:41 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bradford, Butler, Cameron and 16 more | 3 hr |
| May 1, 4:10 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 13 more | 95 min |
| May 1, 6:02 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Cumberland, Dauphin and 13 more | 3 hr |
| May 2, 12:43 PM EDT | Mesoscale Discussion | SPC | Bucks, Carbon, Delaware, Lehigh, Monroe, Montgomery and 3 more | 2 hr |
| May 6, 3:49 PM EDT | Mesoscale Discussion | SPC | Cameron, Centre, Clarion, Clearfield, Clinton, Elk and 6 more | 116 min |
| May 7, 12:49 PM EDT | Mesoscale Discussion | SPC | Adams, Armstrong, Bedford, Berks, Blair, Cambria and 29 more | 116 min |
| May 7, 3:21 PM EDT | Mesoscale Discussion | SPC | Adams, Blair, Centre, Clearfield, Clinton, Cumberland and 10 more | 114 min |
| May 7, 6:07 PM EDT | Mesoscale Discussion | SPC | Berks, Chester, Columbia, Dauphin, Lancaster, Lebanon and 3 more | 53 min |
| May 8, 2:48 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Fayette, Franklin, Fulton, Greene and 2 more | 117 min |
| May 8, 4:46 PM EDT | Mesoscale Discussion | SPC | Fayette, Somerset, Washington | 59 min |
| May 10, 4:33 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 14 more | 87 min |
| May 11, 10:07 AM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Centre, Clinton, Columbia, Luzerne and 10 more | 113 min |
| May 11, 10:30 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 17 more | 2 hr |
| May 11, 12:32 PM EDT | Mesoscale Discussion | SPC | Adams, Blair, Bradford, Centre, Clinton, Columbia and 21 more | 118 min |
| May 11, 2:52 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 18 more | 113 min |
| May 11, 3:54 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Bradford, Centre, Clinton and 24 more | 2 hr |
| May 23, 1:47 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 11 more | 88 min |
| May 23, 4:41 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 7 more | 94 min |
| May 23, 6:35 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Greene and 3 more | 115 min |
| May 31, 1:06 PM EDT | Mesoscale Discussion | SPC | Adams, Franklin | 114 min |
| May 31, 3:58 PM EDT | Mesoscale Discussion | SPC | Adams, Chester, Delaware, Lancaster, York | 2 hr |
| Jun 8, 6:29 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 17 more | 91 min |
| Jun 12, 12:02 PM EDT | Mesoscale Discussion | SPC | Adams, Chester, Cumberland, Lancaster, York | 58 min |
| Jun 12, 4:06 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Bucks, Chester, Cumberland and 13 more | 114 min |
| Jun 12, 6:02 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Blair, Butler, Cambria, Centre and 5 more | 58 min |
| Jun 13, 12:52 PM EDT | Mesoscale Discussion | SPC | Adams, York | 83 min |
| Jun 14, 12:01 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Cambria, Carbon and 25 more | 119 min |
| Jun 14, 4:53 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Cumberland and 10 more | 2 hr |
| Jun 26, 4:29 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Crawford, Greene, Lawrence and 3 more | 91 min |
| Jul 4, 10:28 AM EDT | Mesoscale Discussion | SPC | Erie | 2 hr |
| Jul 4, 2:45 PM EDT | Mesoscale Discussion | SPC | Clarion, Crawford, Erie, Forest, Lawrence, Mercer and 2 more | 60 min |
| Jul 4, 4:29 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 14 more | 2 hr |
| Jul 4, 7:29 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 14 more | 61 min |
| Jul 5, 4:20 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Chester, Cumberland, Delaware and 6 more | 2 hr |
| Jul 6, 12:28 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Fayette, Franklin, Fulton, Greene and 2 more | 2 hr |
| Jul 6, 7:23 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Chester, Cumberland, Dauphin and 11 more | 67 min |
| Jul 7, 12:10 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Columbia, Lackawanna, Lebanon and 10 more | 65 min |
| Jul 7, 2:23 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 12 more | 67 min |
| Jul 7, 2:56 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Crawford, Greene, Lawrence and 3 more | 94 min |
| Jul 7, 6:29 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 7 more | 61 min |
| Jul 7, 6:52 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 12 more | 53 min |
| Jul 8, 12:57 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 7 more | 63 min |
| Jul 8, 2:57 AM EDT | Mesoscale Discussion | SPC | Beaver, Washington | 63 min |
| Jul 8, 6:06 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 6 more | 114 min |
| Jul 8, 7:29 AM EDT | Mesoscale Discussion | SPC | Armstrong, Fayette, Indiana, Somerset, Westmoreland | 61 min |
| Jul 8, 3:02 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 9 more | 28 min |
| Jul 8, 5:05 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Crawford, Greene, Lawrence and 3 more | 115 min |
| Jul 8, 8:12 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 15 more | 93 min |
| Jul 8, 11:16 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Fulton, Huntingdon, Juniata, Mifflin and 1 more | 119 min |
| Jul 9, 10:28 AM EDT | Mesoscale Discussion | SPC | Adams, Franklin, York | 92 min |
| Jul 9, 3:48 PM EDT | Mesoscale Discussion | SPC | Delaware | 117 min |
| Jul 9, 7:36 PM EDT | Mesoscale Discussion | SPC | Delaware, Philadelphia | 114 min |
| Jul 10, 6:57 PM EDT | Mesoscale Discussion | SPC | Bedford, Fayette, Fulton, Somerset | 93 min |
| Jul 12, 10:53 AM EDT | Mesoscale Discussion | SPC | Allegheny, Fayette, Greene, Washington, Westmoreland | 2 hr |
| Jul 12, 11:51 AM EDT | Mesoscale Discussion | SPC | Greene, Washington | 114 min |
| Jul 12, 3:11 PM EDT | Mesoscale Discussion | SPC | Greene, Washington | 2 hr |
| Jul 14, 3:49 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 7 more | 56 min |
| Jul 15, 11:49 AM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Clarion, Crawford, Elk, Erie and 9 more | 116 min |
| Jul 18, 1:35 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Fayette, Greene and 3 more | 115 min |
| Jul 18, 4:49 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Cambria, Fayette and 5 more | 116 min |
| Jul 18, 6:47 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Fayette, Greene, Washington and 1 more | 88 min |
| Jul 21, 1:15 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Blair, Bradford, Butler, Cambria and 36 more | 2 hr |
| Jul 21, 3:51 PM EDT | Mesoscale Discussion | SPC | Blair, Bradford, Cambria, Cameron, Centre, Clearfield and 25 more | 114 min |
| Jul 21, 7:51 PM EDT | Mesoscale Discussion | SPC | Bucks, Northampton | 84 min |
| Jul 22, 1:19 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 86 min |
| Jul 22, 3:16 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 19 more | 59 min |
| Jul 23, 1:05 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 18 more | 115 min |
| Jul 27, 4:31 PM EDT | Mesoscale Discussion | SPC | Blair, Carbon, Centre, Clearfield, Clinton, Columbia and 14 more | 89 min |
| Jul 27, 5:40 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 29 more | 2 hr |
| Jul 27, 8:18 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Blair and 36 more | 117 min |
| Aug 2, 6:17 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Centre, Clinton, Somerset | 3 hr |
| Aug 16, 12:51 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Clarion, Clinton, Elk, Forest and 11 more | 114 min |
| Aug 16, 6:26 PM EDT | Mesoscale Discussion | SPC | Armstrong, Bradford, Cameron, Clarion, Clearfield, Clinton and 12 more | 64 min |
| Aug 16, 6:53 PM EDT | Mesoscale Discussion | SPC | Greene, Washington | 97 min |
| Aug 22, 12:32 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 3 more | 118 min |
| Aug 22, 3:27 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Bedford, Berks, Blair and 39 more | 3 hr |
| Aug 22, 4:10 PM EDT | Mesoscale Discussion | SPC | Bucks, Delaware, Montgomery, Philadelphia | 95 min |
| Aug 22, 7:22 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Northampton, Philadelphia and 1 more | 53 min |
| Aug 26, 12:27 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 7 more | 63 min |
| Aug 26, 8:30 AM EDT | Mesoscale Discussion | SPC | Cameron, Clarion, Crawford, Elk, Erie, Forest and 7 more | 2 hr |
| Aug 26, 11:08 AM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Bedford, Butler, Cambria, Fayette and 6 more | 2 hr |
| Aug 26, 2:19 PM EDT | Mesoscale Discussion | SPC | Bedford, Fulton | 116 min |
| Aug 26, 3:46 PM EDT | Mesoscale Discussion | SPC | Fayette, Greene, Washington | 119 min |
| Aug 26, 7:55 PM EDT | Mesoscale Discussion | SPC | Beaver, Greene, Washington | 65 min |
| Aug 26, 10:18 PM EDT | Mesoscale Discussion | SPC | Fayette, Greene | 57 min |
| Aug 27, 6:11 AM EDT | Mesoscale Discussion | SPC | Bedford, Fayette, Fulton, Greene, Somerset | 2 hr |
| Aug 27, 9:23 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Cambria, Centre, Cumberland and 8 more | 2 hr |
| Aug 27, 11:48 AM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Beaver, Bedford, Cambria, Columbia and 18 more | 87 min |
| Aug 27, 3:09 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Franklin, Fulton, Somerset | 66 min |
| Aug 27, 5:03 PM EDT | Mesoscale Discussion | SPC | Bedford, Fayette, Franklin, Fulton, Greene, Somerset and 1 more | 87 min |
| Aug 27, 6:56 PM EDT | Mesoscale Discussion | SPC | Adams | 64 min |
| Aug 29, 1:32 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 26 more | 2 hr |
| Aug 29, 2:59 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Bucks, Carbon, Chester and 24 more | 3 hr |
| Aug 29, 4:51 PM EDT | Mesoscale Discussion | SPC | Armstrong, Beaver, Butler, Cameron, Centre, Clarion and 12 more | 84 min |
| Sep 1, 7:17 PM EDT | Mesoscale Discussion | SPC | Adams, York | 88 min |
| Sep 27, 12:06 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Crawford, Lawrence and 3 more | 84 min |
| Sep 27, 3:37 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 17 more | 113 min |
| Sep 27, 5:15 AM EDT | Mesoscale Discussion | SPC | Beaver, Crawford, Lawrence, Mercer, Venango, Warren | 60 min |
| Sep 27, 2:22 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Bradford, Centre, Clinton, Columbia and 16 more | 113 min |
| Sep 27, 6:52 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Centre, Clinton, Franklin, Fulton and 5 more | 53 min |
| Oct 14, 10:45 AM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Berks and 28 more | 90 min |
| Oct 14, 6:45 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Cameron, Centre, Clearfield and 6 more | 90 min |
| Nov 12, 6:37 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Clarion and 16 more | 53 min |
| Nov 12, 9:39 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Bedford, Blair, Butler, Cambria and 16 more | 66 min |
| Nov 19, 2:56 PM EST | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Lebanon and 5 more | 2 hr |
| Dec 5, 12:20 PM EST | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Beaver, Bedford, Berks and 38 more | 6 hr |
| Dec 5, 6:48 PM EST | Mesoscale Discussion | SPC | Carbon, Lackawanna, Monroe, Northampton, Pike, Wayne | 4 hr |
| Dec 14, 6:39 AM EST | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Centre, Clinton, Franklin and 11 more | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Washington County53
- Greene County49
- Fayette County44
- Allegheny County44
- Beaver County43
- Armstrong County41
- Bedford County38
- Westmoreland County38
- Butler County38
- Lawrence County37
- Somerset County37
- Adams County36
- Fulton County35
- Blair County34
- Cambria County34
- Clarion County34
- Franklin County33
- Indiana County33
- Venango County33
- Mercer County32
- York County31
- Jefferson County31
- Huntingdon County30
- Clearfield County30
- Forest County29
- Centre County28
- Clinton County28
- Cumberland County26
- Juniata County26
- Perry County26
- Cameron County26
- Elk County26
- Lancaster County25
- Lycoming County25
- Mifflin County25
- Crawford County25
- Potter County24
- McKean County23
- Warren County23
- Snyder County23
27 more counties
- Dauphin County22
- Lebanon County22
- Schuylkill County22
- Berks County21
- Delaware County21
- Columbia County21
- Northumberland County21
- Chester County20
- Union County20
- Montgomery County19
- Tioga County18
- Bucks County18
- Northampton County17
- Philadelphia County17
- Montour County17
- Bradford County16
- Luzerne County16
- Sullivan County16
- Carbon County16
- Lehigh County15
- Wyoming County15
- Susquehanna County14
- Monroe County14
- Erie County12
- Pike County11
- Wayne County11
- Lackawanna County10
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20022004
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.