Alert archive / Pennsylvania / Mesoscale Discussions in 2007

Mesoscale Discussion 2228

December 15, 20076 states

The Storm Prediction Center issued this mesoscale discussion at Dec 15, 2007, 7:43 PM EST for 6 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Dec 15, 2007, 7:43 PM EST (00:43 UTC)
Expired: Dec 16, 2007, 1:45 AM EST
In force: 6 hr
Issued by: the Storm Prediction Center

All 106 counties

Allegany County, MD, Carroll County, MD, Frederick County, MD, Garrett County, MD, Howard County, MD, Montgomery County, MD, Washington County, MD, Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Steuben County, NY, Columbiana County, OH, Mahoning County, OH, Adams County, PA, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Bradford County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Crawford County, PA, Cumberland County, PA, Dauphin County, PA, Elk County, PA, Fayette County, PA, Forest County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lawrence County, PA, Lebanon County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Westmoreland County, PA, Wyoming County, PA, York County, PA, Alleghany County, VA, Augusta County, VA, Bath County, VA, Botetourt County, VA, City of Buena Vista, VA, City of Covington, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Craig County, VA, Frederick County, VA, Giles County, VA, Highland County, VA, Loudoun County, VA, Montgomery County, VA, Page County, VA, Pulaski County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Greenbrier County, WV, Hampshire County, WV, Hancock County, WV, Hardy County, WV, Jefferson County, WV, Mercer County, WV, Mineral County, WV, Monroe County, WV, Morgan County, WV, Pendleton County, WV, Pocahontas County, WV, Summers County, WV, Tucker County, WV

The radar

The Pittsburgh radar (KPBZ), 140 km from the middle of the area, began a volume at 00:47 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, 0.7 hours before the alert went out and 124 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 659 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 240 m²/s²
0-3 km storm-relative helicity: 535 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 16, 2:21 AM EST	Mesoscale Discussion	SPC	Albany, Allegany, Broome, Cattaraugus, Cayuga, Chemung and 42 more	5 hr
Dec 16, 8:29 AM EST	Mesoscale Discussion	SPC	Clinton, Essex, Franklin, Hamilton, St. Lawrence, Warren and 1 more	5 hr
Dec 16, 1:14 PM EST	Mesoscale Discussion	SPC	Clinton, Franklin, Jefferson, Lewis, St. Lawrence	6 hr
Dec 16, 12:52 AM EST	Mesoscale Discussion	SPC	Allen, Defiance, Fulton, Henry, Lucas, Mercer and 5 more	5 hr
Dec 16, 7:28 AM EST	Mesoscale Discussion	SPC	Defiance, Fulton, Henry, Mercer, Paulding, Van Wert and 1 more	4 hr
Dec 16, 2:05 AM EST	Mesoscale Discussion	SPC	City of Virginia Beach	85 min

Nearby

Mesoscale Discussions in Pennsylvania, 2007 Mesoscale Discussions in Virginia, 2007 Mesoscale Discussions in West Virginia, 2007 Every mesoscale discussion in 2007

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.