Alert archive / Virginia / Mesoscale Discussions in 2008

Mesoscale Discussion 824

May 8, 20085 states

The Storm Prediction Center issued this mesoscale discussion at May 8, 2008, 2:22 PM EDT for 5 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: May 8, 2008, 2:22 PM EDT (18:22 UTC)
Expired: May 8, 2008, 3:45 PM EDT
In force: 83 min
Issued by: the Storm Prediction Center

All 77 counties

Breathitt County, KY, Carter County, KY, Elliott County, KY, Floyd County, KY, Johnson County, KY, Knott County, KY, Lawrence County, KY, Letcher County, KY, Magoffin County, KY, Martin County, KY, Morgan County, KY, Perry County, KY, Pike County, KY, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Haywood County, NC, Henderson County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yancey County, NC, Carter County, TN, Cocke County, TN, Greene County, TN, Hamblen County, TN, Hawkins County, TN, Johnson County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, Alleghany County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Buchanan County, VA, Carroll County, VA, City of Bristol, VA, City of Buena Vista, VA, City of Covington, VA, City of Galax, VA, City of Lexington, VA, City of Norton, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Dickenson County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Lee County, VA, Montgomery County, VA, Patrick County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA, McDowell County, WV, Mingo County, WV, Monroe County, WV, Wayne County, WV

The radar

The Jackson,KY radar (KJKL), 143 km from the middle of the area, began a volume at 18:22 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

Roanoke, VA (KRNK), launched 12:00Z, 6.4 hours before the alert went out and 223 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: 29 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 977 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 182 m²/s²
0-3 km storm-relative helicity: 200 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
May 8, 6:27 PM EDT	Mesoscale Discussion	SPC	Boone, Breckinridge, Bullitt, Campbell, Carroll, Daviess and 13 more	63 min
May 8, 6:12 PM EDT	Mesoscale Discussion	SPC	Alamance, Alleghany, Caswell, Forsyth, Guilford, Person and 5 more	63 min
May 8, 6:48 PM EDT	Tornado Watch	SPC	Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more	9 hr
May 8, 7:20 PM EDT	Tornado Watch	SPC	Alamance, Alexander, Anson, Avery, Buncombe, Burke and 29 more	8 hr
May 8, 11:07 AM EDT	Mesoscale Discussion	SPC	Franklin, Giles, Grundy, Hamilton, Lawrence, Lincoln and 2 more	83 min
May 8, 1:37 PM EDT	Mesoscale Discussion	SPC	Franklin, Grundy, Hamilton, Lincoln, Marion, Moore and 1 more	83 min
May 8, 1:40 PM EDT	Tornado Watch	SPC	Bledsoe, Bradley, Franklin, Hamilton, Lincoln, McMinn and 7 more	5 hr

Nearby

Mesoscale Discussions in Virginia, 2008 Mesoscale Discussions in North Carolina, 2008 Mesoscale Discussions in Kentucky, 2008 Every mesoscale discussion in 2008

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.