Alert archive / Virginia / Mesoscale Discussions in 2013

Mesoscale Discussion 322

March 24, 201329 counties in Virginia; 8 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2013, 11:53 AM EDT for 29 counties in Virginia; 8 counties in West Virginia. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Mar 24, 2013, 11:53 AM EDT (15:53 UTC)
Expired: Mar 24, 2013, 5:30 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 37 counties

Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Botetourt County, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, Craig County, VA, Giles County, VA, Greene County, VA, Highland County, VA, Madison County, VA, Montgomery County, VA, Nelson County, VA, Page County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Grant County, WV, Greenbrier County, WV, Hardy County, WV, Monroe County, WV, Pendleton County, WV, Pocahontas County, WV, Randolph County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 140 km from the middle of the area, began a volume at 15:55 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 3.9 hours before the alert went out and 231 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1325 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 280 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
Mar 24, 7:13 PM EDT	Mesoscale Discussion	SPC	Alleghany, Bath, Highland, City of Covington	6 hr

Nearby

Mesoscale Discussions in Virginia, 2013 Mesoscale Discussions in West Virginia, 2013 Every mesoscale discussion in 2013

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.