Alert archive / Pennsylvania / Mesoscale Discussions / 2011

Mesoscale Discussions in Pennsylvania, September 2011

11 mesoscale discussions in September 2011. 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 September 2011. Tap one for its archive.

Mesoscale Discussions
11
Busiest day
September 4, 20112 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
Sep 4, 1:33 PM EDTMesoscale DiscussionSPCBedford, Blair, Bradford, Cambria, Cameron, Centre and 28 more87 min
Sep 4, 6:06 PM EDTMesoscale DiscussionSPCBradford, Clinton, Columbia, Lackawanna, Luzerne, Lycoming and 9 more54 min
Sep 4, 8:35 PM EDTMesoscale DiscussionSPCBradford, Clinton, Columbia, Lackawanna, Luzerne, Lycoming and 10 more55 min
Sep 7, 3:36 PM EDTMesoscale DiscussionSPCBerks, Bucks, Chester, Delaware, Montgomery, Philadelphia84 min
Sep 11, 6:38 PM EDTMesoscale DiscussionSPCAdams, Bedford, Chester, Cumberland, Dauphin, Delaware and 8 more97 min
Sep 13, 7:00 PM EDTMesoscale DiscussionSPCCrawford, Erie, Forest, McKean, Mercer, Venango and 1 more60 min
Sep 14, 3:22 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Carbon, Chester, Cumberland and 11 more53 min
Sep 25, 6:34 PM EDTMesoscale DiscussionSPCAllegheny, Beaver, Butler, Crawford, Greene, Lawrence and 2 more86 min
Sep 26, 2:16 PM EDTMesoscale DiscussionSPCBeaver, Crawford, Greene, Lawrence, Mercer, Washington59 min
Sep 28, 4:45 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Columbia, Dauphin and 13 more60 min
Sep 29, 11:22 AM EDTMesoscale DiscussionSPCCarbon, Monroe, Northampton, Pike83 min

By county

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

22 more counties

Nearby

Alerts in force nowTornadoes on recordThe radar archive20102012

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.