Alert archive / South Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 1971

August 12, 200419 counties in Georgia; 4 counties in North Carolina; 34 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2004, 10:02 AM EDT for 19 counties in Georgia; 4 counties in North Carolina; 34 counties in South Carolina. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Aug 12, 2004, 10:02 AM EDT (14:02 UTC)
Expired
Aug 12, 2004, 11:30 AM EDT
In force
88 min
Issued by
the Storm Prediction Center
All 57 counties

Bleckley County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Columbia County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glascock County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, McDuffie County, GA, Richmond County, GA, Screven County, GA, Treutlen County, GA, Washington County, GA, Wilkinson County, GA, Bladen County, NC, Columbus County, NC, Pender County, NC, Robeson County, NC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper 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

The radar

The Charleston,SC radar (KCLX), 71 km from the middle of the area, began a volume at 14:04 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

Charleston AFB, SC (KCHS), launched 12:00Z, 2.0 hours before the alert went out and 132 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-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2004-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3311 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2004-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3311 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
489 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
1.7
Supercell composite
10.5

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.

IssuedProductOfficeCountiesLasted
Aug 12, 4:09 AM EDTMesoscale DiscussionSPCBarrow, Bartow, Carroll, Cherokee, Clayton, Cobb and 14 more3 hr
Aug 12, 8:00 AM EDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 32 more3 hr
Aug 12, 8:50 AM EDTTornado WatchSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 38 more5 hr
Aug 12, 11:45 AM EDTTornado WatchSPCBleckley, Bryan, Bulloch, Burke, Candler, Chatham and 25 more6 hr
Aug 12, 12:50 PM EDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 30 more55 min
Aug 12, 1:50 PM EDTTornado WatchSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 19 more7 hr
Aug 12, 4:06 PM EDTMesoscale DiscussionSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more84 min
Aug 12, 7:02 PM EDTMesoscale DiscussionSPCBrantley, Camden, Glynn, McIntosh, Wayne88 min
Aug 12, 1:34 PM EDTMesoscale DiscussionSPCAlamance, Beaufort, Bertie, Camden, Caswell, Chatham and 28 more86 min
Aug 12, 2:25 PM EDTTornado WatchSPCAlamance, Beaufort, Bertie, Cabarrus, Camden, Caswell and 39 more6 hr
Aug 12, 5:55 PM EDTMesoscale DiscussionSPCBrunswick, Carteret, New Hanover, Onslow, Pender65 min
Aug 12, 6:47 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Camden, Chowan, Currituck, Gates and 7 more58 min

Nearby

Mesoscale Discussions in South Carolina, 2004Mesoscale Discussions in Georgia, 2004Mesoscale Discussions in North Carolina, 2004Every mesoscale discussion in 2004

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.