Alert archive / South Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 2183

September 7, 200434 counties in Georgia; Columbus County, Robeson County, North Carolina; 45 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 7, 2004, 11:29 AM EDT for 34 counties in Georgia; Columbus County, Robeson County, North Carolina; 45 counties in South Carolina. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Sep 7, 2004, 11:29 AM EDT (15:29 UTC)
Expired
Sep 7, 2004, 1:00 PM EDT
In force
91 min
Issued by
the Storm Prediction Center
All 81 counties

Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Columbia County, GA, Effingham County, GA, Elbert County, GA, Emanuel County, GA, Evans County, GA, Franklin County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Hart County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Montgomery County, GA, Oglethorpe County, GA, Richmond County, GA, Screven County, GA, Stephens County, GA, Taliaferro County, GA, Tattnall County, GA, Toombs County, GA, Treutlen County, GA, Warren County, GA, Washington County, GA, Wheeler County, GA, Wilkes County, GA, Columbus County, NC, Robeson County, NC, Abbeville County, SC, Aiken County, SC, Allendale County, SC, Anderson 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, Greenville County, SC, Greenwood County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Orangeburg County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, Williamsburg County, SC, York County, SC

The radar

The Columbia radar (KCAE), 19 km from the middle of the area, began a volume at 15:32 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, 3.5 hours before the alert went out and 166 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 2004-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2597 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 2004-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939Sfc1 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
2597 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
466 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 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.

449 
ACUS11 KWNS 071532
SWOMCD
SPC MCD 071529 
NCZ000-SCZ000-GAZ000-071700-

MESOSCALE DISCUSSION 2183
NWS STORM PREDICTION CENTER NORMAN OK
1029 AM CDT TUE SEP 07 2004

AREAS AFFECTED...SC / ERN GA / NC

CONCERNING...TORNADO WATCH 808...

VALID 071529Z - 071700Z

TORNADO THREAT CONTINUES....PARTICULARLY ACROSS THE ERN 2/3 OF SC. 
NEW TORNADO WATCH WILL BE ISSUED WITHIN THE NEXT HOUR REPLACING WW
808...WHICH WILL EXTEND SLIGHTLY FURTHER NWD INTO SRN NC.

LATEST RADAR IMAGERY SHOWS FRANCES DRIFTING VERY SLOWLY NNEWD ACROSS
SWRN GA.  ALTHOUGH A LIMITED TORNADO THREAT WILL CONTINUE ACROSS N
FL -- PRIMARILY WITHIN MAIN FEEDER BAND EXTENDING FROM JUST N OF TPA
TO JUST S OF JAX -- AS WELL AS INTO PARTS OF ERN GA...GREATEST
THREAT REMAINS ACROSS SC.  

THICK CLOUD COVER EXISTS ACROSS MOST OF SC...ALTHOUGH SOME BREAKS
ARE EVIDENT ACROSS NRN PORTIONS OF THE STATE.  SOME THINNING IN THE
CLOUD COVER MAY OCCUR WITH TIME ACROSS SRN AND WRN PORTIONS OF THE
STATE...AS DRY SLOT SPREADS NEWD INTO THE REGION.  OVERALL
HOWEVER...EXPECT ONLY MINIMAL HEATING / DESTABILIZATION ACROSS THIS
REGION.

NONETHELESS...SUFFICIENT INSTABILITY EXISTS TO SUPPORT THUNDERSTORMS
-- PARTICULARLY ACROSS THE NERN THIRD OF THE STATE WHERE THINNER
CLOUD COVER AND ASSOCIATED WEAK HEATING HAS ALLOWED AROUND 1000 J/KG
MEAN-LAYER CAPE TO DEVELOP.  WITH LATEST COLUMBIA AND CHARLESTON SC
VWPS SHOWING PERSISTENT 35 TO 40 KTS 0-1 KM SHEAR / OVER 300 M2/S2
0-1 KM HELICITY...LOW-LEVEL ROTATION AND ISOLATED TORNADOES WILL
REMAIN A THREAT FOR THE NEXT SEVERAL HOURS.

..GOSS.. 09/07/2004

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...RAH...ILM...CHS...CAE...GSP...FFC...

35128235 35008149 34787918 34137842 32258044 31948119
32038293 34828353

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 7, 12:30 AM EDTMesoscale DiscussionSPCBrantley, Bryan, Bulloch, Camden, Chatham, Effingham and 7 more2 hr
Sep 7, 3:22 AM EDTMesoscale DiscussionSPCBrantley, Bryan, Bulloch, Camden, Charlton, Chatham and 8 more83 min
Sep 7, 4:00 AM EDTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 15 more10 hr
Sep 7, 5:30 AM EDTMesoscale DiscussionSPCFannin, Gilmer, Murray, Rabun, Towns, Union3 hr
Sep 7, 7:34 AM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 15 more116 min
Sep 7, 11:55 AM EDTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 12 more7 hr
Sep 7, 3:19 PM EDTMesoscale DiscussionSPCAppling, Bryan, Bulloch, Burke, Candler, Chatham and 28 more116 min
Sep 7, 6:07 PM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Columbia, Effingham, Jenkins and 4 more53 min
Sep 7, 6:40 PM EDTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more6 hr
Sep 7, 1:45 PM EDTTornado WatchSPCBladen, Brunswick, Columbus, Cumberland, Harnett, Hoke and 3 more5 hr

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.