Alert archive / Virginia / Mesoscale Discussions in 2015

Mesoscale Discussion 946

June 8, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2015, 4:46 PM EDT for 4 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jun 8, 2015, 4:46 PM EDT (20:46 UTC)
Expired: Jun 8, 2015, 5:45 PM EDT
In force: 59 min
Issued by: the Storm Prediction Center

All 53 counties

Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Washington County, MD, Adams County, PA, Berks County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Northampton County, PA, Schuylkill County, PA, York County, PA, Albemarle County, VA, Arlington County, VA, Augusta County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Harrisonburg, 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, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, Loudoun County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Stafford County, VA, Warren County, VA, Berkeley County, WV, Jefferson County, WV

The radar

The Sterling radar (KLWX), 79 km from the middle of the area, began a volume at 20:50 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.

Severe Thunderstorm Watch 279Jun 8, 7:20 PM EDT

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.8 hours before the alert went out and 80 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: 1040 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 249 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 8, 1:10 PM EDT	Mesoscale Discussion	SPC	Allegany, Garrett	2 hr
Jun 8, 1:31 PM EDT	Mesoscale Discussion	SPC	Washington	119 min
Jun 8, 2:34 PM EDT	Tornado Watch	SPC	Allegany, Anne Arundel, Baltimore, Carroll, Charles, Frederick and 6 more	5 hr
Jun 8, 2:40 PM EDT	Severe Thunderstorm Watch	SPC	Garrett	6 hr
Jun 8, 7:07 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Carroll, Charles, Frederick, Harford and 4 more	53 min
Jun 8, 7:24 PM EDT	Severe Thunderstorm Watch	SPC	Anne Arundel, Baltimore, Carroll, Charles, Harford, Howard and 3 more	2 hr
Jun 8, 1:39 PM EDT	Tornado Watch	SPC	Bradford, Lackawanna, Luzerne, Pike, Susquehanna, Wayne and 1 more	6 hr
Jun 8, 2:58 PM EDT	Mesoscale Discussion	SPC	Bradford, Columbia, Lackawanna, Luzerne, Lycoming, Monroe and 6 more	92 min
Jun 8, 3:20 PM EDT	Mesoscale Discussion	SPC	Adams, Berks, Bucks, Carbon, Centre, Chester and 25 more	85 min
Jun 8, 4:13 PM EDT	Tornado Watch	SPC	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	4 hr
Jun 8, 7:12 PM EDT	Mesoscale Discussion	SPC	Lackawanna, Luzerne, Pike, Wayne	93 min
Jun 8, 1:08 PM EDT	Mesoscale Discussion	SPC	Lee	97 min
Jun 8, 4:24 PM EDT	Mesoscale Discussion	SPC	Bland, Buchanan, Dickenson, Lee, Russell, Scott and 6 more	96 min
Jun 8, 6:24 PM EDT	Mesoscale Discussion	SPC	Amherst, Appomattox, Bedford, Bland, Buckingham, Campbell and 27 more	96 min

Nearby

Mesoscale Discussions in Virginia, 2015 Mesoscale Discussions in Pennsylvania, 2015 Mesoscale Discussions in Maryland, 2015 Every mesoscale discussion in 2015

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.