Alert archive / North Carolina / Mesoscale Discussions in 2003

Mesoscale Discussion 1780

July 11, 200348 counties in North Carolina; 13 counties in South Carolina; 15 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2003, 6:34 PM EDT for 48 counties in North Carolina; 13 counties in South Carolina; 15 counties in Virginia. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jul 11, 2003, 6:34 PM EDT (22:34 UTC)
Expired: Jul 11, 2003, 8:00 PM EDT
In force: 86 min
Issued by: the Storm Prediction Center

All 76 counties

Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Camden County, NC, Carteret County, NC, Chatham County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Currituck County, NC, Dare 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, Moore County, NC, Nash County, NC, New Hanover 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, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Berkeley County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Williamsburg County, SC, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Newport News, VA, City of Norfolk, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, Greensville County, VA, Isle of Wight County, VA, Northampton County, VA, Southampton County, VA, York County, VA

The radar

The Wilmington radar (KLTX), 58 km from the middle of the area, began a volume at 22:35 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.

Severe Thunderstorm Watch 727Jul 11, 7:05 PM EDT

The nearest sounding before it

Newport, NC (KMHX), launched 12:00Z, 10.6 hours before the alert went out and 149 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, 12:45 PM EDT	Mesoscale Discussion	SPC	Anson, Beaufort, Bertie, Bladen, Camden, Chatham and 41 more	2 hr
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, 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 Virginia, 2003 Mesoscale Discussions in South Carolina, 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.