Alert archive / Pennsylvania / Mesoscale Discussions / 2009

Mesoscale Discussions in Pennsylvania, August 2009

21 mesoscale discussions in August 2009. 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 2009. Tap one for its archive.

Mesoscale Discussions
21
Busiest day
August 21, 20094 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 2, 10:01 AM EDTMesoscale DiscussionSPCBucks, Delaware, Montgomery, Philadelphia119 min
Aug 4, 6:09 PM EDTMesoscale DiscussionSPCCrawford, Erie, Forest, McKean, Warren66 min
Aug 9, 11:36 AM EDTMesoscale DiscussionSPCBradford, Cameron, Centre, Clarion, Clearfield, Clinton and 10 more24 min
Aug 9, 2:45 PM EDTMesoscale DiscussionSPCAdams, Berks, Blair, Bradford, Bucks, Cameron and 42 more60 min
Aug 9, 7:11 PM EDTMesoscale DiscussionSPCBerks, Bradford, Bucks, Cameron, Carbon, Centre and 37 more2 hr
Aug 9, 10:47 PM EDTMesoscale DiscussionSPCBradford, Cameron, Centre, Clarion, Clearfield, Clinton and 20 more118 min
Aug 10, 2:26 PM EDTMesoscale DiscussionSPCClarion, Crawford, Elk, Erie, Forest, McKean and 4 more2 hr
Aug 10, 4:40 PM EDTMesoscale DiscussionSPCCarbon, Lackawanna, Luzerne, Monroe, Northampton, Pike and 2 more2 hr
Aug 10, 8:15 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Bradford, Cambria and 35 more2 hr
Aug 11, 12:39 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 14 more2 hr
Aug 12, 12:36 PM EDTMesoscale DiscussionSPCBedford, Blair, Cambria, Centre, Clearfield, Clinton and 16 more84 min
Aug 12, 1:01 PM EDTMesoscale DiscussionSPCBucks, Chester, Delaware, Montgomery, Philadelphia89 min
Aug 18, 2:32 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Bradford and 33 more88 min
Aug 19, 1:21 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Bedford, Berks, Blair, Bradford and 44 more84 min
Aug 19, 6:05 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lancaster and 6 more55 min
Aug 20, 6:20 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 14 more55 min
Aug 20, 10:40 PM EDTMesoscale DiscussionSPCArmstrong, Bedford, Blair, Cambria, Cameron, Centre and 14 more95 min
Aug 21, 10:01 AM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Chester, Delaware, Lancaster and 8 more119 min
Aug 21, 1:58 PM EDTMesoscale DiscussionSPCBucks, Montgomery, Northampton, Philadelphia92 min
Aug 21, 5:55 PM EDTMesoscale DiscussionSPCPhiladelphia80 min
Aug 28, 12:24 PM EDTMesoscale DiscussionSPCDelaware2 hr

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 archive20082010

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.