Alert archive / Pennsylvania / Mesoscale Discussions in 2011
Mesoscale Discussion 116
The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2011, 11:50 PM EST for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 20, 2011, 11:50 PM EST (04:50 UTC)
- Expired
- Feb 21, 2011, 4:45 AM EST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 63 counties
Sussex County, NJ, Allegany County, NY, Broome County, NY, Cattaraugus County, NY, Chautauqua County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Ontario County, NY, Orange County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Sullivan County, NY, Tioga County, NY, Tompkins County, NY, Ulster County, NY, Wyoming County, NY, Yates County, NY, Ashtabula County, OH, Geauga County, OH, Mahoning County, OH, Portage County, OH, Trumbull County, OH, Bradford County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Carbon County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Crawford County, PA, Elk County, PA, Erie County, PA, Forest County, PA, Indiana County, PA, Jefferson County, PA, Lackawanna County, PA, Lawrence County, PA, Luzerne County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Monroe County, PA, Montour County, PA, Northumberland County, PA, Pike County, PA, Potter County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Venango County, PA, Warren County, PA, Wayne County, PA, Wyoming County, PA
The radar
The Buffalo radar (KBUF), 114 km from the middle of the area, began a volume at 04:52 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
Pittsburgh, PA (KPIT), launched 00:00Z, 4.8 hours before the alert went out and 242 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
- 455 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 615 m²/s²
- 0-3 km storm-relative helicity
- 1010 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 |
|---|---|---|---|---|
| Feb 20, 7:46 PM EST | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Chautauqua, Chemung, Erie, Livingston and 4 more | 4 hr |
| Feb 21, 10:20 AM EST | Mesoscale Discussion | SPC | Allen, Ashland, Auglaize, Champaign, Crawford, Darke and 30 more | 5 hr |
| Feb 21, 6:33 PM EST | Mesoscale Discussion | SPC | Belmont, Fairfield, Franklin, Guernsey, Hocking, Licking and 8 more | 5 hr |
| Feb 21, 5:58 PM EST | Mesoscale Discussion | SPC | Adams, Allegheny, Armstrong, Bedford, Blair, Cambria and 12 more | 4 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2011Mesoscale Discussions in New York, 2011Mesoscale Discussions in Ohio, 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.