Alert archive / Virginia / Mesoscale Discussions in 2007

Mesoscale Discussion 1385

July 4, 200788 counties in Virginia; 6 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2007, 4:27 PM EDT for 88 counties in Virginia; 6 counties in West Virginia. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jul 4, 2007, 4:27 PM EDT (20:27 UTC)
Expired: Jul 4, 2007, 5:30 PM EDT
In force: 63 min
Issued by: the Storm Prediction Center

All 94 counties

Albemarle County, VA, Alleghany County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Brunswick County, VA, Buckingham County, VA, Campbell County, VA, Caroline County, VA, Carroll County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Covington, VA, City of Emporia, VA, City of Franklin, VA, City of Galax, VA, City of Hampton, VA, City of Hopewell, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Radford, VA, City of Richmond, VA, City of Roanoke, VA, City of Salem, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Waynesboro, VA, City of Williamsburg, VA, Craig County, VA, Cumberland County, VA, Dinwiddie County, VA, Essex County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Giles County, VA, Gloucester County, VA, Goochland County, VA, Grayson County, VA, Greensville County, VA, Halifax County, VA, Hanover County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King William County, VA, Lancaster County, VA, Louisa County, VA, Lunenburg County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, Montgomery County, VA, Nelson County, VA, New Kent County, VA, Northampton County, VA, Nottoway County, VA, Patrick County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Pulaski County, VA, Richmond County, VA, Roanoke County, VA, Rockbridge County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, Wythe County, VA, York County, VA, Greenbrier County, WV, Mercer County, WV, Monroe County, WV, Raleigh County, WV, Summers County, WV, Wyoming County, WV

The radar

The Roanoke radar (KFCX), 105 km from the middle of the area, began a volume at 20:28 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 486Jul 4, 5:00 PM EDT

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.5 hours before the alert went out and 233 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: 139 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 759 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 4, 12:39 PM EDT	Mesoscale Discussion	SPC	Accomack, Arlington, Caroline, Clarke, Culpeper, Essex and 24 more	66 min
Jul 4, 2:06 PM EDT	Tornado Watch	SPC	Arlington, Augusta, Clarke, Culpeper, Fairfax, Fauquier and 22 more	8 hr
Jul 4, 4:13 PM EDT	Mesoscale Discussion	SPC	Arlington, Augusta, Caroline, Clarke, Culpeper, Fairfax and 27 more	62 min
Jul 4, 5:01 PM EDT	Severe Thunderstorm Watch	SPC	Albemarle, Alleghany, Amelia, Amherst, Appomattox, Bath and 46 more	4 hr
Jul 4, 1:27 PM EDT	Mesoscale Discussion	SPC	Braxton, Cabell, Calhoun, Clay, Doddridge, Gilmer and 18 more	63 min
Jul 4, 1:41 PM EDT	Tornado Watch	SPC	Barbour, Braxton, Brooke, Cabell, Calhoun, Doddridge and 22 more	7 hr

Nearby

Mesoscale Discussions in Virginia, 2007 Mesoscale Discussions in West Virginia, 2007 Every mesoscale discussion in 2007

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.