Alert archive / Pennsylvania / Mesoscale Discussions
Mesoscale Discussions in Pennsylvania, 2017
123 mesoscale discussions in 2017. 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 2017. Tap one for its archive.
- Mesoscale Discussions
- 123
- Busiest month
- July24 mesoscale discussions
- Busiest day
- August 22, 20178 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 10, 6:13 PM EST | Mesoscale Discussion | SPC | Bradford, Cameron, Centre, Clearfield, Clinton, Elk and 7 more | 6 hr |
| Jan 12, 10:42 AM EST | Mesoscale Discussion | SPC | Beaver, Lawrence | 3 hr |
| Jan 12, 2:22 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 10 more | 2 hr |
| Feb 8, 9:40 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 17 more | 4 hr |
| Feb 9, 4:55 AM EST | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Delaware and 16 more | 6 hr |
| Feb 24, 8:49 PM EST | Mesoscale Discussion | SPC | Beaver, Crawford, Lawrence, Mercer, Washington | 116 min |
| Feb 25, 12:16 PM EST | Mesoscale Discussion | SPC | Berks, Bradford, Bucks, Carbon, Chester, Columbia and 19 more | 89 min |
| Feb 25, 4:26 PM EST | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Lehigh and 2 more | 94 min |
| Feb 25, 4:44 PM EST | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 3 more | 91 min |
| Mar 1, 2:19 AM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Clarion and 13 more | 86 min |
| Mar 1, 9:44 AM EST | Mesoscale Discussion | SPC | Adams, Bedford, Cumberland, Franklin, Fulton, Lancaster and 2 more | 91 min |
| Mar 1, 12:25 PM EST | Mesoscale Discussion | SPC | Adams, Cumberland, Franklin, Fulton, York | 65 min |
| Mar 1, 12:50 PM EST | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 55 min |
| Mar 1, 2:50 PM EST | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Lehigh, Montgomery, Northampton and 1 more | 55 min |
| Mar 1, 3:56 PM EST | Mesoscale Discussion | SPC | Beaver, Butler, Crawford, Lawrence, Mercer, Venango and 1 more | 2 hr |
| Mar 10, 8:18 AM EST | Mesoscale Discussion | SPC | Bucks, Montgomery | 4 hr |
| Mar 13, 10:01 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Cumberland and 11 more | 4 hr |
| Mar 14, 3:22 AM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 35 more | 5 hr |
| Mar 14, 9:04 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 29 more | 4 hr |
| Apr 6, 12:18 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Philadelphia | 57 min |
| Apr 6, 3:12 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 63 min |
| Apr 16, 2:15 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 31 more | 3 hr |
| Apr 20, 2:40 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 20 more | 65 min |
| Apr 30, 2:58 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 10 more | 2 hr |
| Apr 30, 3:25 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Franklin, Fulton | 95 min |
| May 1, 11:59 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 8 more | 2 hr |
| May 1, 1:41 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Cameron, Centre, Clearfield and 15 more | 64 min |
| May 1, 4:36 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Bradford, Centre, Clinton, Franklin and 15 more | 84 min |
| May 1, 7:16 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Northampton, Philadelphia | 2 hr |
| May 5, 4:07 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Butler, Clarion, Fayette, Greene and 3 more | 113 min |
| May 5, 6:15 PM EDT | Mesoscale Discussion | SPC | Franklin | 90 min |
| May 18, 2:04 PM EDT | Mesoscale Discussion | SPC | Crawford, Elk, Erie, Forest, McKean, Potter and 3 more | 116 min |
| May 18, 4:35 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 5 more | 85 min |
| May 18, 5:36 PM EDT | Mesoscale Discussion | SPC | McKean, Potter, Tioga, Warren | 84 min |
| May 18, 7:33 PM EDT | Mesoscale Discussion | SPC | Bradford, Susquehanna | 87 min |
| May 19, 3:36 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Lancaster, Montgomery, Philadelphia and 1 more | 114 min |
| May 19, 5:50 PM EDT | Mesoscale Discussion | SPC | Greene, Washington | 55 min |
| May 28, 4:09 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Lawrence, Mercer, Venango | 66 min |
| May 28, 5:46 PM EDT | Mesoscale Discussion | SPC | Armstrong, Butler, Clarion, Crawford, Erie, Forest and 5 more | 59 min |
| May 28, 7:39 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Forest, Mercer, Venango, Warren | 96 min |
| May 30, 12:03 PM EDT | Mesoscale Discussion | SPC | Armstrong, Bedford, Blair, Cambria, Cameron, Centre and 15 more | 2 hr |
| May 30, 4:03 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Bradford, Centre, Clinton and 13 more | 117 min |
| May 31, 12:29 PM EDT | Mesoscale Discussion | SPC | Lackawanna, Susquehanna, Wayne, Wyoming | 61 min |
| May 31, 2:05 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 7 more | 85 min |
| May 31, 7:34 PM EDT | Mesoscale Discussion | SPC | Susquehanna, Wayne | 86 min |
| Jun 5, 12:32 PM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Sullivan, Susquehanna, Tioga, Wayne and 1 more | 2 hr |
| Jun 5, 3:00 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Fayette, Greene, Lawrence and 2 more | 3 hr |
| Jun 13, 12:18 PM EDT | Mesoscale Discussion | SPC | Fayette, Greene, Washington | 2 hr |
| Jun 14, 2:20 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Fayette, Greene, Lawrence and 3 more | 2 hr |
| Jun 15, 4:01 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Butler, Clarion, Elk, Fayette and 8 more | 119 min |
| Jun 18, 12:31 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 19 more | 119 min |
| Jun 18, 3:31 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Bradford, Cambria, Centre, Clinton and 14 more | 2 hr |
| Jun 18, 4:30 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 9 more | 90 min |
| Jun 19, 10:45 AM EDT | Mesoscale Discussion | SPC | Adams, Berks, Carbon, Chester, Columbia, Cumberland and 21 more | 3 hr |
| Jun 19, 2:21 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 114 min |
| Jun 21, 2:38 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bucks, Cambria and 26 more | 3 hr |
| Jun 22, 1:18 PM EDT | Mesoscale Discussion | SPC | Armstrong, Beaver, Blair, Bradford, Butler, Cambria and 25 more | 2 hr |
| Jun 23, 1:15 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Greene, Lawrence, Washington | 2 hr |
| Jun 23, 3:35 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 6 more | 115 min |
| Jun 23, 4:53 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Cumberland, Dauphin, Fayette, Franklin and 8 more | 2 hr |
| Jun 23, 8:25 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Chester, Cumberland, Delaware and 9 more | 65 min |
| Jun 30, 12:48 PM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Luzerne, Pike, Sullivan, Susquehanna and 2 more | 2 hr |
| Jun 30, 4:20 PM EDT | Mesoscale Discussion | SPC | Susquehanna, Wayne | 115 min |
| Jun 30, 7:06 PM EDT | Mesoscale Discussion | SPC | Lackawanna, Susquehanna, Wayne, Wyoming | 54 min |
| Jul 1, 12:54 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Centre and 32 more | 66 min |
| Jul 1, 4:10 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 18 more | 2 hr |
| Jul 7, 8:02 AM EDT | Mesoscale Discussion | SPC | Beaver, Butler, Lawrence, Mercer, Washington | 2 hr |
| Jul 7, 3:35 PM EDT | Mesoscale Discussion | SPC | Greene | 85 min |
| Jul 10, 3:08 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Fayette, Greene, Washington, Westmoreland | 2 hr |
| Jul 13, 11:09 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 12 more | 2 hr |
| Jul 13, 2:33 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Dauphin and 18 more | 57 min |
| Jul 13, 4:43 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Cumberland, Dauphin and 11 more | 62 min |
| Jul 13, 6:23 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Philadelphia | 97 min |
| Jul 14, 1:09 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Chester, Cumberland, Dauphin, Delaware and 8 more | 2 hr |
| Jul 14, 4:23 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Bucks, Chester, Cumberland, Delaware and 8 more | 67 min |
| Jul 17, 12:14 PM EDT | Mesoscale Discussion | SPC | Berks, Blair, Bradford, Cameron, Carbon, Centre and 29 more | 2 hr |
| Jul 17, 3:37 PM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Luzerne, Sullivan, Susquehanna, Tioga and 2 more | 53 min |
| Jul 17, 6:58 PM EDT | Mesoscale Discussion | SPC | Carbon, Lackawanna, Luzerne, Monroe, Northampton, Pike and 2 more | 62 min |
| Jul 20, 11:36 AM EDT | Mesoscale Discussion | SPC | Cameron, Clarion, Crawford, Elk, Erie, Forest and 6 more | 114 min |
| Jul 20, 3:03 PM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, Luzerne, Sullivan, Susquehanna, Tioga and 2 more | 87 min |
| Jul 20, 3:50 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 10 more | 2 hr |
| Jul 20, 4:33 PM EDT | Mesoscale Discussion | SPC | Berks, Bradford, Bucks, Carbon, Columbia, Dauphin and 17 more | 87 min |
| Jul 20, 7:48 PM EDT | Mesoscale Discussion | SPC | Bucks, Lehigh, Montgomery, Northampton, Philadelphia | 87 min |
| Jul 22, 8:34 AM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Fayette, Greene, Somerset, Washington and 1 more | 86 min |
| Jul 23, 3:44 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Carbon, Chester, Clinton and 23 more | 3 hr |
| Jul 24, 12:41 AM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 2 hr |
| Jul 24, 2:17 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 44 more | 118 min |
| Jul 24, 6:09 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Lehigh and 3 more | 3 hr |
| Aug 2, 1:30 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Bucks, Carbon, Chester and 31 more | 2 hr |
| Aug 3, 6:28 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Cumberland and 14 more | 62 min |
| Aug 4, 11:38 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 14 more | 2 hr |
| Aug 4, 3:46 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Bradford, Butler and 34 more | 119 min |
| Aug 4, 7:41 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Bedford, Blair, Bradford and 43 more | 2 hr |
| Aug 11, 3:48 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Centre, Clinton, Columbia and 20 more | 87 min |
| Aug 12, 1:41 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Bradford, Cambria, Cameron and 27 more | 2 hr |
| Aug 12, 5:17 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Carbon, Chester, Columbia and 26 more | 88 min |
| Aug 17, 8:00 PM EDT | Mesoscale Discussion | SPC | Crawford, Lawrence, Mercer, Venango | 90 min |
| Aug 18, 1:54 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 16 more | 2 hr |
| Aug 18, 4:34 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 12 more | 86 min |
| Aug 19, 2:13 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 21 more | 3 hr |
| Aug 19, 4:43 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 26 more | 2 hr |
| Aug 19, 8:16 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Carbon, Columbia, Cumberland and 18 more | 59 min |
| Aug 21, 2:53 PM EDT | Mesoscale Discussion | SPC | Adams, Centre, Clinton, Columbia, Cumberland, Dauphin and 16 more | 2 hr |
| Aug 22, 11:54 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Greene and 5 more | 66 min |
| Aug 22, 11:55 AM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Clinton, Lycoming, McKean, Potter and 4 more | 3 hr |
| Aug 22, 2:44 PM EDT | Mesoscale Discussion | SPC | Bradford, Potter, Tioga | 2 hr |
| Aug 22, 2:44 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 13 more | 91 min |
| Aug 22, 3:08 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 18 more | 67 min |
| Aug 22, 4:39 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Blair, Butler, Cambria and 13 more | 66 min |
| Aug 22, 4:48 PM EDT | Mesoscale Discussion | SPC | Bradford, Lycoming, McKean, Potter, Sullivan, Tioga | 87 min |
| Aug 22, 7:07 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Carbon, Chester, Columbia and 24 more | 113 min |
| Aug 22, 10:53 PM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Montgomery, Philadelphia | 97 min |
| Sep 4, 6:50 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, McKean, Warren | 115 min |
| Sep 4, 10:26 PM EDT | Mesoscale Discussion | SPC | Erie | 64 min |
| Sep 5, 2:31 PM EDT | Mesoscale Discussion | SPC | Adams, Cumberland, Dauphin, Franklin, Fulton, Juniata and 3 more | 59 min |
| Sep 5, 5:00 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 8 more | 90 min |
| Oct 15, 3:03 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 15 more | 57 min |
| Nov 5, 4:51 PM EST | Mesoscale Discussion | SPC | Beaver, Crawford, Lawrence, Mercer | 114 min |
| Nov 5, 7:06 PM EST | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Forest and 6 more | 84 min |
| Dec 15, 5:42 PM EST | Mesoscale Discussion | SPC | Erie | 4 hr |
| Dec 25, 3:23 AM EST | Mesoscale Discussion | SPC | Bradford, Centre, Clinton, Columbia, Cumberland, Dauphin and 15 more | 3 hr |
| Dec 25, 10:57 AM EST | Mesoscale Discussion | SPC | Crawford, Erie | 4 hr |
| Dec 25, 8:01 PM EST | Mesoscale Discussion | SPC | Erie | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Montgomery County39
- Chester County38
- Bucks County36
- Delaware County35
- Lebanon County35
- Lancaster County34
- Washington County33
- Philadelphia County33
- Beaver County32
- Lawrence County32
- Lehigh County32
- Sullivan County32
- Cumberland County32
- York County32
- Berks County31
- Luzerne County31
- Northampton County31
- Wyoming County31
- Butler County30
- Schuylkill County30
- Susquehanna County30
- Bradford County29
- Allegheny County29
- Dauphin County29
- Adams County29
- Franklin County29
- Clarion County28
- Westmoreland County28
- Greene County28
- Carbon County28
- Lackawanna County28
- Perry County28
- Clinton County27
- Snyder County27
- Armstrong County27
- Monroe County27
- Wayne County27
- Lycoming County26
- Tioga County26
- Mercer County26
27 more counties
- Montour County26
- Northumberland County26
- Union County25
- Indiana County25
- Jefferson County25
- Venango County25
- Columbia County25
- Centre County24
- Fayette County24
- Juniata County24
- Mifflin County23
- Forest County22
- Pike County22
- Crawford County22
- Fulton County22
- Huntingdon County22
- Elk County21
- Blair County21
- Clearfield County20
- Potter County20
- Cambria County20
- Cameron County19
- McKean County19
- Warren County18
- Bedford County18
- Somerset County17
- Erie County16
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.