Alert archive / Virginia / Mesoscale Discussions in 2008

Mesoscale Discussion 1113

May 31, 20085 states

The Storm Prediction Center issued this mesoscale discussion at May 31, 2008, 8:54 AM EDT for 5 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 31, 2008, 8:54 AM EDT (12:54 UTC)
Expired: May 31, 2008, 10:30 AM EDT
In force: 96 min
Issued by: the Storm Prediction Center

All 44 counties

New Castle County, DE, Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Kent 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, Lancaster County, PA, Lebanon County, PA, York County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, 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, Loudoun County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 51 km from the middle of the area, began a volume at 12:57 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, 0.9 hours before the alert went out and 54 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: 658 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 965 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.6

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
May 31, 10:20 AM EDT	Tornado Watch	SPC	Kent, New Castle	7 hr
May 31, 4:10 AM EDT	Tornado Watch	SPC	Garrett	6 hr
May 31, 12:05 PM EDT	Mesoscale Discussion	SPC	Saint Mary's, Somerset	55 min
May 31, 3:07 PM EDT	Tornado Watch	SPC	Calvert, Charles, Dorchester, Saint Mary's, Somerset, Wicomico and 1 more	6 hr
May 31, 4:28 PM EDT	Mesoscale Discussion	SPC	Garrett	62 min
May 31, 2:56 AM EDT	Mesoscale Discussion	SPC	Beaver, Lawrence, Mercer	94 min
May 31, 7:27 AM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Cambria, Fayette, Greene, Indiana and 3 more	2 hr
May 31, 2:55 PM EDT	Mesoscale Discussion	SPC	McKean, Potter, Tioga	65 min
May 31, 5:34 PM EDT	Mesoscale Discussion	SPC	Bradford, Cameron, Carbon, Centre, Clarion, Clearfield and 24 more	26 min
May 31, 4:04 PM EDT	Mesoscale Discussion	SPC	Brunswick, Dinwiddie, Greensville, Isle of Wight, Lunenburg, Mecklenburg and 7 more	56 min
May 31, 4:23 PM EDT	Tornado Watch	SPC	Appomattox, Brunswick, Campbell, Charlotte, Dinwiddie, Greensville and 23 more	4 hr
May 31, 6:19 PM EDT	Mesoscale Discussion	SPC	Lee	56 min
May 31, 7:37 PM EDT	Mesoscale Discussion	SPC	Accomack, Brunswick, Caroline, Charles City, Chesterfield, Dinwiddie and 36 more	53 min

Nearby

Mesoscale Discussions in Virginia, 2008 Mesoscale Discussions in Maryland, 2008 Mesoscale Discussions in Pennsylvania, 2008 Every mesoscale discussion in 2008

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.