Alert archive / Pennsylvania / Mesoscale Discussions / 2009
Mesoscale Discussions in Pennsylvania, May 2009
11 mesoscale discussions in May 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 May 2009. Tap one for its archive.
- Mesoscale Discussions
- 11
- Busiest day
- May 16, 20093 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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 6:36 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Elk and 6 more | 54 min |
| May 16, 12:05 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Bradford and 43 more | 55 min |
| May 16, 3:55 PM EDT | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Bedford, Berks, Blair and 43 more | 65 min |
| May 16, 6:29 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Bradford, Bucks and 41 more | 2 hr |
| May 23, 12:49 PM EDT | Mesoscale Discussion | SPC | Bedford, Blair, Bradford, Cambria, Centre, Clinton and 22 more | 56 min |
| May 24, 11:49 AM EDT | Mesoscale Discussion | SPC | Berks, Carbon, Lackawanna, Lehigh, Luzerne, Monroe and 5 more | 116 min |
| May 24, 7:11 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bucks, Chester, Cumberland, Dauphin and 10 more | 64 min |
| May 28, 4:54 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 16 more | 66 min |
| May 29, 12:20 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Chester, Cumberland, Delaware, Franklin and 6 more | 55 min |
| May 29, 4:30 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Lancaster, Philadelphia, York | 60 min |
| May 29, 6:20 PM EDT | Mesoscale Discussion | SPC | Delaware, Philadelphia | 55 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Cumberland County6
- Franklin County6
- Fulton County6
- Jefferson County5
- Cambria County5
- Dauphin County5
- Lackawanna County5
- Luzerne County5
- Wyoming County5
- Berks County5
- Lancaster County5
- York County5
- Delaware County5
- Philadelphia County5
- Allegheny County4
- Armstrong County4
- Clarion County4
- Elk County4
- Forest County4
- Bedford County4
- Blair County4
- Bradford County4
- Cameron County4
- Centre County4
- Clearfield County4
- Clinton County4
- Columbia County4
- Huntingdon County4
- Indiana County4
- Juniata County4
- Lycoming County4
- Mifflin County4
- Montour County4
- Northumberland County4
- Perry County4
- Snyder County4
- Somerset County4
- Sullivan County4
- Susquehanna County4
- Tioga County4
26 more counties
- Union County4
- Adams County4
- Lebanon County4
- Schuylkill County4
- Chester County4
- Beaver County3
- Butler County3
- Lawrence County3
- Venango County3
- Washington County3
- Fayette County3
- Greene County3
- McKean County3
- Potter County3
- Westmoreland County3
- Carbon County3
- Wayne County3
- Lehigh County3
- Montgomery County3
- Northampton County3
- Mercer County2
- Warren County2
- Bucks County2
- Monroe County2
- Pike County2
- Crawford County1
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.