Alert archive / Virginia / Mesoscale Discussions in 2013

Mesoscale Discussion 1013

June 10, 20136 states

The Storm Prediction Center issued this mesoscale discussion at Jun 10, 2013, 12:56 PM EDT for 6 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 10, 2013, 12:56 PM EDT (16:56 UTC)
Expired: Jun 10, 2013, 3:00 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 133 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Frederick County, MD, Harford 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, Gates County, NC, Hertford County, NC, Northampton County, NC, Warren County, NC, Cumberland County, NJ, Salem County, NJ, Accomack County, VA, Albemarle County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Augusta County, VA, Bedford County, VA, Botetourt County, VA, Brunswick County, VA, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Danville, VA, City of Emporia, VA, City of Fairfax, VA, City of Falls Church, VA, City of Franklin, VA, City of Fredericksburg, VA, City of Hampton, VA, City of Harrisonburg, VA, City of Hopewell, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Martinsville, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Richmond, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Waynesboro, VA, City of Williamsburg, VA, Clarke County, VA, Culpeper County, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Franklin County, VA, Gloucester County, VA, Goochland County, VA, Greene County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Henry County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Lancaster County, VA, Loudoun County, VA, Louisa County, VA, Lunenburg County, VA, Madison County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, Montgomery County, VA, Nelson County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Orange County, VA, Page County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Roanoke County, VA, Rockbridge County, VA, Southampton County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Sussex County, VA, Warren County, VA, Westmoreland County, VA, York County, VA, Jefferson County, WV

The radar

The Norfolk radar (KAKQ), 67 km from the middle of the area, began a volume at 16:57 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 4.9 hours before the alert went out and 163 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: 9 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 742 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 200 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
Jun 10, 2:02 PM EDT	Tornado Watch	SPC	Kent, New Castle, Sussex	10 hr
Jun 10, 4:38 PM EDT	Mesoscale Discussion	SPC	Kent, New Castle, Sussex	97 min
Jun 10, 6:49 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Caroline, Charles, Dorchester and 10 more	86 min
Jun 10, 11:31 AM EDT	Mesoscale Discussion	SPC	Anson, Cabarrus, Chatham, Cleveland, Cumberland, Davidson and 18 more	119 min
Jun 10, 1:18 PM EDT	Tornado Watch	SPC	Alamance, Alexander, Anson, Bladen, Brunswick, Burke and 47 more	9 hr
Jun 10, 4:03 PM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Chatham, Cumberland, Davidson, Durham and 20 more	87 min
Jun 10, 5:47 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Brunswick, Chowan, Columbus, Craven and 14 more	58 min
Jun 10, 6:27 PM EDT	Mesoscale Discussion	SPC	Graham	93 min
Jun 10, 7:20 PM EDT	Mesoscale Discussion	SPC	Bladen, Brunswick, Columbus, Craven, Cumberland, Duplin and 14 more	85 min
Jun 10, 2:32 PM EDT	Mesoscale Discussion	SPC	Lee	88 min
Jun 10, 3:02 PM EDT	Severe Thunderstorm Watch	SPC	Buchanan, Dickenson, Lee, Russell, Scott, Washington and 3 more	7 hr

Nearby

Mesoscale Discussions in Virginia, 2013 Mesoscale Discussions in Maryland, 2013 Mesoscale Discussions in North Carolina, 2013 Every mesoscale discussion in 2013

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.