Alert archive / North Carolina / Mesoscale Discussions in 2003

Mesoscale Discussion 1771

July 11, 200347 counties in North Carolina; 21 counties in South Carolina; 16 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2003, 12:45 PM EDT for 47 counties in North Carolina; 21 counties in South Carolina; 16 counties in Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 11, 2003, 12:45 PM EDT (16:45 UTC)
Expired: Jul 11, 2003, 2:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 84 counties

Anson County, NC, Beaufort County, NC, Bertie County, NC, Bladen County, NC, Camden County, NC, Chatham 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, Hyde 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, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Pitt County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Tyrrell County, NC, Union County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Calhoun County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon 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, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Williamsburg 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 Petersburg, VA, City of Suffolk, VA, Dinwiddie County, VA, Greensville County, VA, Henrico County, VA, Isle of Wight County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA

The radar

The Raleigh/Durham radar (KRAX), 71 km from the middle of the area, began a volume at 16:46 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

Newport, NC (KMHX), launched 12:00Z, 4.8 hours before the alert went out and 161 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: 1617 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 788 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 7.4

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 10, 9:29 PM EDT	Mesoscale Discussion	SPC	Alleghany, Ashe, Avery, Buncombe, Haywood, Jackson and 5 more	31 min
Jul 11, 1:55 PM EDT	Severe Thunderstorm Watch	SPC	Anson, Scotland, Union	6 hr
Jul 11, 4:10 PM EDT	Severe Thunderstorm Watch	SPC	Alamance, Anson, Bertie, Cabarrus, Camden, Caswell and 44 more	4 hr
Jul 11, 4:49 PM EDT	Mesoscale Discussion	SPC	Scotland	116 min
Jul 11, 6:34 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 42 more	86 min
Jul 11, 7:05 PM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Chowan and 22 more	6 hr
Jul 10, 10:37 PM EDT	Mesoscale Discussion	SPC	Albemarle, Amherst, Appomattox, Arlington, Bedford, Buckingham and 33 more	83 min

Nearby

Mesoscale Discussions in North Carolina, 2003 Mesoscale Discussions in South Carolina, 2003 Mesoscale Discussions in Virginia, 2003 Every mesoscale discussion in 2003

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.