Alert archive / Virginia / Mesoscale Discussions in 2009

Mesoscale Discussion 104

February 11, 20095 states

The Storm Prediction Center issued this mesoscale discussion at Feb 11, 2009, 5:32 PM EST for 5 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Feb 11, 2009, 5:32 PM EST (22:32 UTC)
Expired: Feb 11, 2009, 7:00 PM EST
In force: 88 min
Issued by: the Storm Prediction Center

All 152 counties

Allegany County, MD, Garrett County, MD, Washington County, MD, Athens County, OH, Belmont County, OH, Carroll County, OH, Coshocton County, OH, Fairfield County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Jefferson County, OH, Licking County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Tuscarawas County, OH, Vinton County, OH, Washington County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Cambria County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Somerset County, PA, Washington County, PA, Westmoreland County, PA, Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Buchanan County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Galax, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, 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, Culpeper County, VA, Cumberland County, VA, Fauquier County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Frederick County, VA, Giles County, VA, Goochland County, VA, Grayson County, VA, Greene County, VA, Highland County, VA, Louisa County, VA, Madison County, VA, Montgomery County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Patrick County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Pulaski County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Russell County, VA, Shenandoah County, VA, Smyth County, VA, Tazewell County, VA, Warren County, VA, Wythe County, VA, Barbour County, WV, Berkeley County, WV, Boone County, WV, Braxton County, WV, Brooke County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Grant County, WV, Greenbrier County, WV, Hampshire County, WV, Hancock County, WV, Hardy County, WV, Harrison County, WV, Jackson County, WV, Jefferson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, Marshall County, WV, Mason County, WV, McDowell County, WV, Mercer County, WV, Mineral County, WV, Monongalia County, WV, Monroe County, WV, Morgan County, WV, Nicholas County, WV, Ohio County, WV, Pendleton County, WV, Pleasants County, WV, Pocahontas County, WV, Preston County, WV, Putnam County, WV, Raleigh County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Summers County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 129 km from the middle of the area, began a volume at 22:34 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

Roanoke, VA (KRNK), launched 12:00Z, 10.5 hours before the alert went out and 170 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: 1087 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 282 m²/s²
0-3 km storm-relative helicity: 347 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
Feb 11, 5:53 PM EST	Severe Thunderstorm Watch	SPC	Allegany, Garrett	4 hr
Feb 11, 11:38 AM EST	Tornado Watch	SPC	Brown, Clermont, Hamilton	6 hr
Feb 11, 1:35 PM EST	Mesoscale Discussion	SPC	Adams, Athens, Belmont, Brown, Butler, Clermont and 25 more	85 min
Feb 11, 1:59 PM EST	Tornado Watch	SPC	Adams, Athens, Belmont, Butler, Carroll, Champaign and 36 more	7 hr
Feb 11, 4:34 PM EST	Mesoscale Discussion	SPC	Adams, Athens, Belmont, Champaign, Clark, Clinton and 32 more	86 min
Feb 11, 11:02 AM EST	Mesoscale Discussion	SPC	Lee	88 min

Nearby

Mesoscale Discussions in Virginia, 2009 Mesoscale Discussions in West Virginia, 2009 Mesoscale Discussions in Ohio, 2009 Every mesoscale discussion in 2009

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.