Alert archive / Pennsylvania / Mesoscale Discussions / 2021
Mesoscale Discussions in Pennsylvania, December 2021
2 mesoscale discussions in December 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 December 2021. Tap one for its archive.
- Mesoscale Discussions
- 2
- Busiest day
- December 12, 20211 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 |
|---|---|---|---|---|
| Dec 11, 7:29 PM EST | Mesoscale Discussion | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lackawanna and 12 more | 3 hr |
| Dec 27, 6:58 AM EST | Mesoscale Discussion | SPC | Bedford, Blair, Cambria, Cameron, Centre, Clarion and 10 more | 5 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Berks County1
- Bucks County1
- Carbon County1
- Chester County1
- Delaware County1
- Lackawanna County1
- Lancaster County1
- Lebanon County1
- Lehigh County1
- Luzerne County1
- Monroe County1
- Montgomery County1
- Northampton County1
- Philadelphia County1
- Pike County1
- Schuylkill County1
- Wayne County1
- York County1
- Bedford County1
- Blair County1
- Cambria County1
- Cameron County1
- Centre County1
- Clarion County1
- Clearfield County1
- Clinton County1
- Elk County1
- Forest County1
- Huntingdon County1
- Indiana County1
- Jefferson County1
- McKean County1
- Somerset County1
- Venango County1
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.