Alert archive / Virginia / Mesoscale Discussions in 2005

Mesoscale Discussion 1867

July 25, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2005, 5:33 PM EDT for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2005, 5:33 PM EDT (21:33 UTC)
Expired: Jul 25, 2005, 6:30 PM EDT
In force: 57 min
Issued by: the Storm Prediction Center

All 87 counties

Allegany County, MD, Charles County, MD, Frederick County, MD, Garrett County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Washington County, MD, Somerset County, PA, Albemarle County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Augusta County, VA, Bedford County, VA, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Charles City County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Colonial Heights, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Hopewell, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Petersburg, VA, City of Richmond, VA, City of Staunton, VA, City of Waynesboro, VA, City of Williamsburg, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Fluvanna County, VA, Frederick County, VA, Goochland County, VA, Greene County, VA, Hanover County, VA, Henrico County, VA, James City County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Nelson County, VA, New Kent County, VA, Nottoway County, VA, Orange County, VA, Page County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Prince William County, VA, Rappahannock County, VA, Richmond County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Warren County, VA, Westmoreland County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 98 km from the middle of the area, began a volume at 21:33 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 683Jul 25, 6:00 PM EDT

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 9.6 hours before the alert went out and 170 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: 310 J/kg
Mixed-layer CIN: -204 J/kg
Mixed-layer LCL: 1178 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 168 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
Jul 25, 6:00 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Garrett, Washington	3 hr
Jul 25, 7:34 PM EDT	Mesoscale Discussion	SPC	Washington	56 min
Jul 24, 11:28 PM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 12 more	92 min
Jul 24, 11:50 PM EDT	Severe Thunderstorm Watch	SPC	Clarion, Crawford, Forest, Jefferson, Mercer, Venango and 1 more	4 hr
Jul 25, 12:57 PM EDT	Mesoscale Discussion	SPC	Allegheny, Beaver, Butler, Fayette, Greene, Lawrence and 2 more	93 min
Jul 25, 2:10 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Armstrong, Beaver, Butler, Fayette, Greene and 3 more	5 hr
Jul 25, 6:21 PM EDT	Mesoscale Discussion	SPC	Armstrong, Fayette, Greene, Indiana, Westmoreland	24 min
Jul 25, 4:45 PM EDT	Severe Thunderstorm Watch	SPC	Alleghany, Bath, Botetourt, City of Covington	4 hr
Jul 25, 7:09 PM EDT	Mesoscale Discussion	SPC	Alleghany, Bath, Craig, City of Covington	66 min
Jul 25, 3:13 PM EDT	Mesoscale Discussion	SPC	Pleasants, Ritchie, Wirt, Wood	92 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.