Alert archive / Pennsylvania / Mesoscale Discussions / 2017
Mesoscale Discussions in Pennsylvania, December 2017
4 mesoscale discussions in December 2017. 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 2017. Tap one for its archive.
- Mesoscale Discussions
- 4
- Busiest day
- December 25, 20172 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 15, 5:42 PM EST | Mesoscale Discussion | SPC | Erie | 4 hr |
| Dec 25, 3:23 AM EST | Mesoscale Discussion | SPC | Bradford, Centre, Clinton, Columbia, Cumberland, Dauphin and 15 more | 3 hr |
| Dec 25, 10:57 AM EST | Mesoscale Discussion | SPC | Crawford, Erie | 4 hr |
| Dec 25, 8:01 PM EST | Mesoscale Discussion | SPC | Erie | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Erie County3
- Bradford County1
- Centre County1
- Clinton County1
- Columbia County1
- Cumberland County1
- Dauphin County1
- Huntingdon County1
- Juniata County1
- Lebanon County1
- Luzerne County1
- Lycoming County1
- Mifflin County1
- Montour County1
- Northumberland County1
- Perry County1
- Schuylkill County1
- Snyder County1
- Sullivan County1
- Tioga County1
- Union County1
- Wyoming County1
- Crawford County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.