Alert archive / Virginia / Mesoscale Discussions in 2012

Mesoscale Discussion 1443

July 9, 201241 counties in North Carolina; Dillon County, South Carolina; 50 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2012, 1:36 PM EDT for 41 counties in North Carolina; Dillon County, South Carolina; 50 counties in Virginia. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jul 9, 2012, 1:36 PM EDT (17:36 UTC)
Expired: Jul 9, 2012, 2:30 PM EDT
In force: 54 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 92 counties

Alamance County, NC, Beaufort County, NC, Bertie County, NC, Caswell County, NC, Chatham County, NC, Chowan County, NC, Cumberland County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Greene County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Moore County, NC, Nash County, NC, Northampton County, NC, Orange County, NC, Perquimans County, NC, Person County, NC, Pitt County, NC, Randolph County, NC, Robeson County, NC, Rockingham County, NC, Sampson County, NC, Scotland County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Dillon County, SC, Albemarle County, VA, Amelia County, VA, Amherst County, VA, Appomattox County, VA, Bedford County, VA, Botetourt County, VA, Brunswick County, VA, Buckingham County, VA, Campbell 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 Danville, VA, City of Emporia, VA, City of Franklin, VA, City of Hopewell, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Petersburg, VA, City of Portsmouth, VA, City of Roanoke, VA, City of Salem, VA, City of Suffolk, VA, Cumberland County, VA, Dinwiddie County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Goochland County, VA, Greensville County, VA, Halifax County, VA, Henry County, VA, Isle of Wight County, VA, Lunenburg County, VA, Mecklenburg County, VA, Montgomery County, VA, Nelson County, VA, Nottoway County, VA, Patrick County, VA, Pittsylvania County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Roanoke County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA

The radar

The Raleigh/Durham radar (KRAX), 95 km from the middle of the area, began a volume at 17:37 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

Roanoke, VA (KRNK), launched 12:00Z, 5.6 hours before the alert went out and 113 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: 43 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 1063 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 68 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 9, 1:01 PM EDT	Mesoscale Discussion	SPC	Alexander, Avery, Buncombe, Burke, Caldwell, Catawba and 20 more	89 min
Jul 9, 2:59 PM EDT	Severe Thunderstorm Watch	SPC	Alamance, Beaufort, Bertie, Bladen, Camden, Carteret and 45 more	7 hr
Jul 9, 3:19 PM EDT	Severe Thunderstorm Watch	SPC	Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more	4 hr
Jul 9, 4:48 PM EDT	Mesoscale Discussion	SPC	Anson, Beaufort, Bertie, Bladen, Camden, Chowan and 39 more	87 min
Jul 9, 5:53 PM EDT	Mesoscale Discussion	SPC	Alamance, Alleghany, Caswell, Davie, Forsyth, Guilford and 7 more	97 min
Jul 9, 7:17 PM EDT	Mesoscale Discussion	SPC	Alamance, Beaufort, Bertie, Brunswick, Camden, Carteret and 25 more	88 min
Jul 9, 12:09 AM EDT	Mesoscale Discussion	SPC	Arlington, Caroline, Clarke, Culpeper, Fairfax, Fauquier and 21 more	96 min

Nearby

Mesoscale Discussions in Virginia, 2012 Mesoscale Discussions in North Carolina, 2012 Mesoscale Discussions in South Carolina, 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.