Alert archive / Pennsylvania / Mesoscale Discussions in 2011
Mesoscale Discussion 2277
The Storm Prediction Center issued this mesoscale discussion at Oct 29, 2011, 7:36 AM EDT for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 29, 2011, 7:36 AM EDT (11:36 UTC)
- Expired
- Oct 29, 2011, 1:00 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 45 counties
Allegany County, MD, Frederick County, MD, Washington County, MD, Sullivan County, NY, Adams County, PA, Bedford County, PA, Berks County, PA, Bradford County, PA, Carbon County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton 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, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA, York County, PA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Tucker County, WV
The radar
The State College radar (KCCX), 91 km from the middle of the area, began a volume at 11:39 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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 11.6 hours before the alert went out and 135 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1309 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 308 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 |
|---|---|---|---|---|
| Oct 29, 12:34 AM EDT | Mesoscale Discussion | SPC | Allegany, Carroll, Frederick, Garrett, Washington | 6 hr |
| Oct 29, 1:01 PM EDT | Mesoscale Discussion | SPC | Albany, Columbia, Delaware, Dutchess, Greene, Orange and 7 more | 5 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2011Mesoscale Discussions in West Virginia, 2011Mesoscale Discussions in Maryland, 2011Every mesoscale discussion in 2011
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.