Alert archive / South Carolina / Mesoscale Discussions in 2003

Mesoscale Discussion 1818

July 13, 200310 counties in North Carolina; 14 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2003, 6:09 PM EDT for 10 counties in North Carolina; 14 counties in South Carolina. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2003, 6:09 PM EDT (22:09 UTC)
Expired: Jul 13, 2003, 7:15 PM EDT
In force: 66 min
Issued by: the Storm Prediction Center

All 24 counties

Bladen County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Jones County, NC, Lenoir County, NC, Onslow County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Abbeville County, SC, Chester County, SC, Chesterfield County, SC, Darlington County, SC, Dillon County, SC, Fairfield County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Marlboro County, SC, Newberry County, SC, Saluda County, SC

The radar

The Wilmington radar (KLTX), 129 km from the middle of the area, began a volume at 22:11 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, 10.2 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: 160 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1169 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 69 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 13, 12:50 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Columbus, Cumberland, Duplin and 18 more	115 min
Jul 13, 1:16 PM EDT	Mesoscale Discussion	SPC	Alleghany, Ashe, Avery, Buncombe, Cherokee, Clay and 12 more	119 min

Nearby

Mesoscale Discussions in South Carolina, 2003 Mesoscale Discussions in North 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.