Alert archive / Virginia / Mesoscale Discussions in 2006

Mesoscale Discussion 467

April 8, 200630 counties in Virginia; 5 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2006, 12:06 AM EDT for 30 counties in Virginia; 5 counties in West Virginia. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Apr 8, 2006, 12:06 AM EDT (04:06 UTC)
Expired: Apr 8, 2006, 1:00 AM EDT
In force: 54 min
Issued by: the Storm Prediction Center

All 35 counties

Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Buena Vista, VA, City of Covington, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Halifax County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Tazewell County, VA, Wythe County, VA, McDowell County, WV, Mercer County, WV, Monroe County, WV, Summers County, WV, Wyoming County, WV

The radar

The Roanoke radar (KFCX), 24 km from the middle of the area, began a volume at 04:08 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 00:00Z, 4.1 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2865 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 219 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
Apr 7, 10:21 PM EDT	Mesoscale Discussion	SPC	Albemarle, Amelia, Amherst, Appomattox, Augusta, Buckingham and 26 more	54 min
Apr 8, 8:30 AM EDT	Mesoscale Discussion	SPC	Amelia, Brunswick, Charles City, Chesterfield, Dinwiddie, Gloucester and 29 more	2 hr

Nearby

Mesoscale Discussions in Virginia, 2006 Mesoscale Discussions in West Virginia, 2006 Every mesoscale discussion in 2006

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.