Alert archive / North Carolina / Mesoscale Discussions in 2012

Mesoscale Discussion 1405

July 5, 201240 counties in North Carolina; 21 counties in South Carolina; 19 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2012, 1:40 PM EDT for 40 counties in North Carolina; 21 counties in South Carolina; 19 counties in Virginia. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jul 5, 2012, 1:40 PM EDT (17:40 UTC)
Expired: Jul 5, 2012, 3:15 PM EDT
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 80 counties

Anson County, NC, Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Northampton County, NC, Onslow County, NC, Pender County, NC, Pitt County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC, Aiken County, SC, Calhoun County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Horry County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Newberry County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Brunswick County, VA, Charles City County, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hopewell, VA, City of Newport News, VA, City of Petersburg, VA, City of Suffolk, VA, City of Williamsburg, VA, Dinwiddie County, VA, Greensville County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA

The radar

The Raleigh/Durham radar (KRAX), 42 km from the middle of the area, began a volume at 17:41 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, 5.7 hours before the alert went out and 127 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: 1093 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1766 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 27 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 5, 11:14 AM EDT	Mesoscale Discussion	SPC	Alleghany, Ashe, Avery, Watauga	91 min
Jul 5, 11:37 AM EDT	Severe Thunderstorm Watch	SPC	Alleghany, Ashe, Stokes, Surry, Watauga, Wilkes and 1 more	7 hr
Jul 5, 1:11 PM EDT	Mesoscale Discussion	SPC	Buncombe, Cherokee, Clay, Graham, Haywood, Henderson and 9 more	94 min
Jul 5, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 22 more	8 hr
Jul 5, 2:57 PM EDT	Mesoscale Discussion	SPC	Alexander, Alleghany, Ashe, Avery, Caldwell, Mitchell and 5 more	2 hr
Jul 5, 3:19 PM EDT	Severe Thunderstorm Watch	SPC	Cherokee, Clay	6 hr
Jul 5, 6:41 PM EDT	Mesoscale Discussion	SPC	Bladen, Columbus, Robeson, Scotland	94 min
Jul 4, 8:05 PM EDT	Mesoscale Discussion	SPC	Clarke, Frederick, Loudoun, Rappahannock, Shenandoah, Warren and 1 more	55 min
Jul 5, 3:29 AM EDT	Mesoscale Discussion	SPC	Essex, King George, Lancaster, Northumberland, Richmond, Stafford and 1 more	91 min

Nearby

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