Alert archive / Pennsylvania / Mesoscale Discussions in 2013
Mesoscale Discussion 1877
The Storm Prediction Center issued this mesoscale discussion at Sep 12, 2013, 12:02 PM EDT for 18 counties in New York; 32 counties in Pennsylvania. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Sep 12, 2013, 12:02 PM EDT (16:02 UTC)
- Expired
- Sep 12, 2013, 1:00 PM EDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 50 counties
Albany County, NY, Broome County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Fulton County, NY, Greene County, NY, Madison County, NY, Montgomery County, NY, Otsego County, NY, Schenectady County, NY, Schoharie County, NY, Schuyler County, NY, Sullivan County, NY, Tioga County, NY, Tompkins County, NY, Ulster County, NY, Blair County, PA, Bradford County, PA, Cameron County, PA, Carbon County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Huntingdon County, PA, Juniata County, PA, Lackawanna County, PA, Lebanon County, PA, Luzerne County, PA, Lycoming County, PA, Mifflin County, PA, Monroe County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Pike County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA
The radar
The Binghamton radar (KBGM), 92 km from the middle of the area, began a volume at 16:03 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 4.0 hours before the alert went out and 241 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1009 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 970 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 9:44 PM EDT | Mesoscale Discussion | SPC | Clinton, Essex, Franklin, St. Lawrence | 61 min |
| Sep 12, 12:24 PM EDT | Mesoscale Discussion | SPC | Columbia | 66 min |
| Sep 12, 12:37 PM EDT | Severe Thunderstorm Watch | SPC | Albany, Broome, Chemung, Chenango, Columbia, Cortland and 20 more | 7 hr |
| Sep 12, 1:03 PM EDT | Severe Thunderstorm Watch | SPC | Orange, Putnam, Rockland, Westchester | 9 hr |
| Sep 12, 2:41 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chemung, Chenango, Cortland, Delaware and 18 more | 64 min |
| Sep 12, 3:26 PM EDT | Mesoscale Discussion | SPC | Columbia, Dutchess, Orange, Putnam, Ulster | 64 min |
| Sep 12, 4:24 PM EDT | Mesoscale Discussion | SPC | Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more | 66 min |
| Sep 12, 2:50 PM EDT | Severe Thunderstorm Watch | SPC | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 6 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2013Mesoscale Discussions in New York, 2013Every mesoscale discussion in 2013
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.