Alert archive / Virginia / Mesoscale Discussions in 2012

Mesoscale Discussion 1436

July 8, 20126 states

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2012, 4:21 PM EDT for 6 states. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jul 8, 2012, 4:21 PM EDT (20:21 UTC)
Expired: Jul 8, 2012, 5:15 PM EDT
In force: 54 min
Issued by: the Storm Prediction Center

All 112 counties

Kent County, DE, Sussex County, DE, Anne Arundel County, MD, Calvert County, MD, Caroline County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Cumberland County, NJ, Gallia County, OH, Accomack County, VA, Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Arlington County, VA, Augusta County, VA, Bath County, VA, Botetourt County, VA, Buchanan County, VA, Buckingham County, VA, Caroline County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Manassas, VA, City of Manassas Park, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Craig County, VA, Culpeper County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Frederick County, VA, Goochland County, VA, Greene County, VA, Hanover County, VA, Highland County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Nelson County, VA, Northumberland County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Westmoreland County, VA, Barbour County, WV, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Fayette County, WV, Gilmer County, WV, Grant County, WV, Greenbrier County, WV, Hardy County, WV, Jackson County, WV, Jefferson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monroe County, WV, Nicholas County, WV, Pendleton County, WV, Pocahontas County, WV, Putnam County, WV, Raleigh County, WV, Randolph County, WV, Roane County, WV, Summers County, WV, Tucker County, WV, Upshur County, WV, Webster County, WV, Wirt County, WV, Wyoming County, WV

The radar

The Sterling radar (KLWX), 178 km from the middle of the area, began a volume at 20:23 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

Roanoke, VA (KRNK), launched 12:00Z, 8.4 hours before the alert went out and 145 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: 223 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1600 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 10 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
Jul 8, 12:47 PM EDT	Mesoscale Discussion	SPC	Kent	88 min
Jul 8, 1:44 PM EDT	Severe Thunderstorm Watch	SPC	Kent, Sussex	8 hr
Jul 8, 1:29 PM EDT	Mesoscale Discussion	SPC	Garrett	61 min
Jul 8, 6:00 PM EDT	Mesoscale Discussion	SPC	Dorchester, Saint Mary's, Somerset, Wicomico, Worcester	60 min
Jul 8, 1:14 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Clermont, Hamilton, Highland, Pike and 1 more	91 min
Jul 8, 2:48 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Clermont, Hamilton, Scioto	6 hr
Jul 8, 4:41 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Clermont, Hamilton, Scioto	64 min
Jul 8, 7:08 PM EDT	Mesoscale Discussion	SPC	Logan, Mingo, Wayne	3 hr

Nearby

Mesoscale Discussions in Virginia, 2012 Mesoscale Discussions in West Virginia, 2012 Mesoscale Discussions in Maryland, 2012 Every mesoscale discussion in 2012

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.