Alert archive / Virginia / Mesoscale Discussions in 2005

Mesoscale Discussion 2123

August 30, 20055 counties in Maryland; 53 counties in Virginia; Jefferson County, West Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 30, 2005, 8:25 PM EDT for 5 counties in Maryland; 53 counties in Virginia; Jefferson County, West Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 30, 2005, 8:25 PM EDT (00:25 UTC)
Expired: Aug 30, 2005, 10:30 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 59 counties

Calvert County, MD, Charles County, MD, Frederick County, MD, Montgomery County, MD, Prince George's County, MD, Albemarle County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Augusta County, VA, Bath County, VA, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Charlotte County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, 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, Cumberland County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Frederick County, VA, Goochland County, VA, Greene County, VA, Hanover County, VA, Highland County, VA, King George County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Powhatan County, VA, Prince Edward County, VA, Prince William County, VA, Rappahannock County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Westmoreland County, VA, Jefferson County, WV

The radar

The Sterling radar (KLWX), 132 km from the middle of the area, began a volume at 00:26 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, 0.4 hours before the alert went out and 134 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: 1575 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 666 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 12.8

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
Aug 30, 10:19 PM EDT	Mesoscale Discussion	SPC	Baltimore, Carroll, Harford, Howard, Washington, City of Baltimore	116 min
Aug 30, 8:02 PM EDT	Mesoscale Discussion	SPC	Alleghany, Amherst, Appomattox, Bath, Bedford, Bland and 29 more	58 min

Nearby

Mesoscale Discussions in Virginia, 2005 Mesoscale Discussions in Maryland, 2005 Mesoscale Discussions in West Virginia, 2005 Every mesoscale discussion in 2005

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.