Alert archive / Virginia / Mesoscale Discussions in 2013

Mesoscale Discussion 1064

June 13, 20136 counties in Maryland; 78 counties in Virginia; 12 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2013, 2:20 PM EDT for 6 counties in Maryland; 78 counties in Virginia; 12 counties in West Virginia. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Jun 13, 2013, 2:20 PM EDT (18:20 UTC)
Expired: Jun 13, 2013, 3:15 PM EDT
In force: 55 min
Issued by: the Storm Prediction Center

All 96 counties

Anne Arundel County, MD, City of Baltimore, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Arlington 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, City of Alexandria, VA, City of Bristol, 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 Galax, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Martinsville, VA, City of Norton, 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, Dickenson County, VA, Fairfax County, VA, Fauquier County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Frederick County, VA, Giles County, VA, Grayson County, VA, Greene County, VA, Henry County, VA, Highland County, VA, Lee County, VA, Loudoun 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, Prince William County, VA, Pulaski County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Russell County, VA, Scott County, VA, Shenandoah County, VA, Smyth County, VA, Spotsylvania County, VA, Stafford County, VA, Tazewell County, VA, Warren County, VA, Washington County, VA, Wise County, VA, Wythe County, VA, Grant County, WV, Greenbrier County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, McDowell County, WV, Mercer County, WV, Monroe County, WV, Pendleton County, WV, Raleigh County, WV, Summers County, WV, Wyoming County, WV

The radar

The Roanoke radar (KFCX), 133 km from the middle of the area, began a volume at 18:22 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, 6.3 hours before the alert went out and 112 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: 1563 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 708 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.4

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 12, 11:22 PM EDT	Mesoscale Discussion	SPC	Allegany, Garrett	53 min
Jun 12, 11:53 PM EDT	Severe Thunderstorm Watch PDS	SPC	Garrett	7 hr
Jun 13, 2:40 AM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 18 more	2 hr
Jun 13, 3:58 AM EDT	Severe Thunderstorm Watch	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 7 more	7 hr
Jun 13, 5:27 AM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 18 more	2 hr
Jun 13, 7:30 AM EDT	Severe Thunderstorm Watch	SPC	Caroline, Cecil, Kent, Queen Anne's, Talbot	4 hr
Jun 13, 8:10 AM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 13 more	95 min
Jun 13, 11:38 AM EDT	Mesoscale Discussion	SPC	Anne Arundel, Calvert, Caroline, Charles, Dorchester, Montgomery and 7 more	67 min
Jun 13, 11:59 AM EDT	Mesoscale Discussion	SPC	Garrett	61 min
Jun 13, 12:19 PM EDT	Severe Thunderstorm Watch	SPC	Anne Arundel, Baltimore, Calvert, Caroline, Charles, Harford and 8 more	7 hr
Jun 13, 2:08 PM EDT	Severe Thunderstorm Watch PDS	SPC	Dorchester, Somerset, Wicomico, Worcester	8 hr
Jun 13, 4:22 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Calvert, Caroline, Charles, Dorchester, Kent and 7 more	53 min
Jun 13, 8:32 AM EDT	Mesoscale Discussion	SPC	Buchanan, Dickenson, Lee, Russell, Scott, Tazewell and 4 more	58 min
Jun 13, 1:53 PM EDT	Mesoscale Discussion	SPC	Amelia, Brunswick, Charles City, Charlotte, Chesterfield, Cumberland and 42 more	97 min
Jun 12, 8:05 PM EDT	Mesoscale Discussion	SPC	Brooke, Hancock, Harrison, Marion, Marshall, Monongalia and 5 more	55 min
Jun 13, 9:08 AM EDT	Severe Thunderstorm Watch	SPC	Barbour, Boone, Braxton, Cabell, Calhoun, Clay and 20 more	5 hr

Nearby

Mesoscale Discussions in Virginia, 2013 Mesoscale Discussions in West Virginia, 2013 Mesoscale Discussions in Maryland, 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.