Alert archive / Pennsylvania / Mesoscale Discussions / 2021

Mesoscale Discussions in Pennsylvania, August 2021

24 mesoscale discussions in August 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 August 2021. Tap one for its archive.

Mesoscale Discussions
24
Busiest day
August 13, 20216 mesoscale discussions

Over time

By day

Days in UTC, the clock the archive keeps.

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
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

By county

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

27 more counties

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. Warning verification from the Mesonet's Cow. Rebuilt daily.