Alert archive / Virginia / Mesoscale Discussions in 2011

Mesoscale Discussion 1180

June 11, 20116 counties in Maryland; 35 counties in Virginia; Berkeley County, Jefferson County, West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2011, 12:44 PM EDT for 6 counties in Maryland; 35 counties in Virginia; Berkeley County, Jefferson County, West Virginia. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jun 11, 2011, 12:44 PM EDT (16:44 UTC)
Expired: Jun 11, 2011, 2:15 PM EDT
In force: 91 min
Issued by: the Storm Prediction Center

All 43 counties

Anne Arundel County, MD, Charles County, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Albemarle County, VA, Arlington County, VA, Caroline County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Frederick County, VA, Goochland County, VA, Greene County, VA, Hanover County, VA, King George County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Orange County, VA, Page County, VA, Powhatan County, VA, Prince William County, VA, Rappahannock County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Westmoreland County, VA, Berkeley County, WV, Jefferson County, WV

The radar

The Sterling radar (KLWX), 49 km from the middle of the area, began a volume at 16:46 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 12:00Z, 4.7 hours before the alert went out and 51 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: 175 J/kg
Mixed-layer CIN: -275 J/kg
Mixed-layer LCL: 1552 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 153 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 11, 1:48 PM EDT	Mesoscale Discussion	SPC	Bedford, Bland, Botetourt, Buchanan, Carroll, Craig and 27 more	87 min
Jun 10, 8:34 PM EDT	Mesoscale Discussion	SPC	Braxton, Calhoun, Doddridge, Gilmer, Jackson, Lewis and 7 more	56 min
Jun 11, 1:40 AM EDT	Mesoscale Discussion	SPC	Cabell, Jackson, Kanawha, Mason, Pleasants, Putnam and 3 more	2 hr

Nearby

Mesoscale Discussions in Virginia, 2011 Mesoscale Discussions in Maryland, 2011 Mesoscale Discussions in West Virginia, 2011 Every mesoscale discussion in 2011

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.