Alert archive / Virginia / Mesoscale Discussions in 2014

Mesoscale Discussion 1079

June 19, 20146 states

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2014, 12:18 AM EDT for 6 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2014, 12:18 AM EDT (04:18 UTC)
Expired: Jun 19, 2014, 1:45 AM EDT
In force: 87 min
Issued by: the Storm Prediction Center

All 84 counties

Kent County, DE, New Castle County, DE, Allegany County, MD, 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, Frederick County, MD, Garrett 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, Talbot County, MD, Washington County, MD, Salem County, NJ, Adams County, PA, Bedford County, PA, Berks County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Union County, PA, York County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Barbour County, WV, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Pendleton County, WV, Preston County, WV, Taylor County, WV, Tucker County, WV

The radar

The Sterling radar (KLWX), 52 km from the middle of the area, began a volume at 04:21 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 4.3 hours before the alert went out and 57 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: 1758 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1858 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 7.3

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 18, 9:06 PM EDT	Mesoscale Discussion	SPC	Allegany, Garrett, Washington	54 min
Jun 18, 9:37 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Baltimore, Carroll, Frederick, Garrett, Harford and 3 more	5 hr
Jun 19, 12:06 PM EDT	Mesoscale Discussion	SPC	Albemarle, Amherst, Appomattox, Augusta, Bedford, Botetourt and 25 more	2 hr
Jun 19, 2:28 PM EDT	Severe Thunderstorm Watch	SPC	Accomack, Amelia, Appomattox, Bedford, Brunswick, Buckingham and 60 more	7 hr
Jun 19, 6:16 PM EDT	Mesoscale Discussion	SPC	Accomack, Amelia, Amherst, Appomattox, Bedford, Brunswick and 57 more	59 min

Nearby

Mesoscale Discussions in Virginia, 2014 Mesoscale Discussions in Pennsylvania, 2014 Mesoscale Discussions in Maryland, 2014 Every mesoscale discussion in 2014

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.