Alert archive / Virginia / Mesoscale Discussions in 2012

Mesoscale Discussion 1330

July 1, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2012, 9:27 AM EDT for 5 states. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jul 1, 2012, 9:27 AM EDT (13:27 UTC)
Expired: Jul 1, 2012, 10:30 AM EDT
In force: 63 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 55 counties

Floyd County, KY, Harlan County, KY, Knott County, KY, Letcher County, KY, Perry County, KY, Pike County, KY, Alleghany County, NC, Ashe County, NC, Forsyth County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Carter County, TN, Johnson County, TN, Sullivan County, TN, Bedford County, VA, Bland County, VA, Buchanan County, VA, Campbell County, VA, Carroll County, VA, City of Bristol, VA, City of Danville, VA, City of Galax, VA, City of Martinsville, 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, Henry County, VA, Lee County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke 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, Mercer County, WV, Monroe County, WV, Wyoming County, WV

The radar

The Roanoke radar (KFCX), 71 km from the middle of the area, began a volume at 13:28 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.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 1.5 hours before the alert went out and 133 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: 1262 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 2188 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 61 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 1, 2:59 PM EDT	Mesoscale Discussion	SPC	Crittenden, Union	61 min
Jul 1, 4:32 PM EDT	Severe Thunderstorm Watch	SPC	Boyd, Greenup	6 hr
Jul 1, 5:59 PM EDT	Severe Thunderstorm Watch	SPC	Anderson, Boone, Bourbon, Boyle, Bracken, Breckinridge and 35 more	5 hr
Jul 1, 9:44 AM EDT	Severe Thunderstorm Watch	SPC	Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more	5 hr
Jul 1, 11:38 AM EDT	Mesoscale Discussion	SPC	Alamance, Alexander, Alleghany, Ashe, Avery, Caldwell and 12 more	97 min
Jul 1, 12:56 PM EDT	Severe Thunderstorm Watch	SPC	Alamance, Anson, Beaufort, Bertie, Camden, Carteret and 51 more	7 hr
Jul 1, 1:39 PM EDT	Mesoscale Discussion	SPC	Alexander, Anson, Buncombe, Burke, Cabarrus, Catawba and 24 more	96 min
Jul 1, 2:01 PM EDT	Severe Thunderstorm Watch	SPC	Bladen, Brunswick, Cabarrus, Catawba, Cleveland, Columbus and 12 more	9 hr
Jul 1, 2:53 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Camden, Carteret, Chowan and 37 more	97 min
Jul 1, 4:15 PM EDT	Mesoscale Discussion	SPC	Bladen, Brunswick, Columbus, Duplin, New Hanover, Pender and 3 more	90 min
Jul 1, 7:04 PM EDT	Mesoscale Discussion	SPC	Alamance, Beaufort, Bertie, Camden, Carteret, Caswell and 40 more	56 min
Jul 1, 7:39 PM EDT	Mesoscale Discussion	SPC	Anson, Bladen, Brunswick, Cabarrus, Cleveland, Columbus and 14 more	96 min
Jul 1, 2:08 PM EDT	Mesoscale Discussion	SPC	Bradley, Franklin, Giles, Grundy, Hamilton, Hardin and 7 more	3 hr
Jul 1, 7:22 PM EDT	Mesoscale Discussion	SPC	Brooke, Hancock, Ohio	83 min

Nearby

Mesoscale Discussions in Virginia, 2012 Mesoscale Discussions in North Carolina, 2012 Mesoscale Discussions in Kentucky, 2012 Every mesoscale discussion in 2012

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.