Alert archive / Pennsylvania / Mesoscale Discussions / 2004
Mesoscale Discussions in Pennsylvania, September 2004
8 mesoscale discussions in September 2004. 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 2004. Tap one for its archive.
- Mesoscale Discussions
- 8
- Busiest day
- September 18, 20043 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 |
|---|---|---|---|---|
| Sep 8, 8:30 PM EDT | Mesoscale Discussion | SPC | Adams, Franklin, Fulton | 2 hr |
| Sep 9, 2:05 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Delaware, Lancaster, Lehigh and 2 more | 2 hr |
| Sep 17, 3:33 PM EDT | Mesoscale Discussion | SPC | Adams, Lancaster, York | 117 min |
| Sep 17, 9:58 PM EDT | Mesoscale Discussion | SPC | Adams, Franklin, Fulton, Lancaster, York | 2 hr |
| Sep 18, 2:39 AM EDT | Mesoscale Discussion | SPC | Bucks, Chester, Delaware, Lehigh, Monroe, Montgomery and 2 more | 2 hr |
| Sep 18, 5:10 AM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Columbia, Dauphin and 15 more | 2 hr |
| Sep 28, 1:49 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Philadelphia | 116 min |
| Sep 28, 4:36 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lancaster and 6 more | 114 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Chester County5
- Delaware County5
- Lancaster County5
- Bucks County4
- Lehigh County4
- Montgomery County4
- Philadelphia County4
- York County4
- Adams County3
- Berks County3
- Monroe County3
- Northampton County3
- Franklin County2
- Fulton County2
- Carbon County2
- Columbia County1
- Dauphin County1
- Lackawanna County1
- Lebanon County1
- Luzerne County1
- Northumberland County1
- Pike County1
- Schuylkill County1
- Wayne County1
- Wyoming County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20032005
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.