Alert archive / South Carolina / Mesoscale Discussions in 2004
Mesoscale Discussion 340
The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2004, 1:52 PM EDT for 13 counties in Georgia; Brunswick County, Columbus County, New Hanover County, North Carolina; 25 counties in South Carolina. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Apr 12, 2004, 1:52 PM EDT (17:52 UTC)
- Expired
- Apr 12, 2004, 3:45 PM EDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 41 counties
Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Jenkins County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Richmond County, GA, Screven County, GA, Brunswick County, NC, Columbus County, NC, New Hanover 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, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC
The radar
The Charleston,SC radar (KCLX), 96 km from the middle of the area, began a volume at 17:53 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, 5.9 hours before the alert went out and 53 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 753 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 265 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
243 ACUS11 KWNS 121753 SWOMCD SPC MCD 121752 NCZ000-SCZ000-GAZ000-121945- MESOSCALE DISCUSSION 0340 NWS STORM PREDICTION CENTER NORMAN OK 1252 PM CDT MON APR 12 2004 AREAS AFFECTED...ERN GA / SERN SC / FAR SERN NC... CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 121752Z - 121945Z THUNDERSTORM DEVELOPMENT POSSIBLE IN THE NEXT 1 TO 2 HOURS ACROSS ERN GA / ERN SC. WE ARE MONITORING THIS REGION FOR POSSIBLE WW ISSUANCE. LATEST SURFACE DATA AND OBJECTIVE ANALYSES INDICATE DESTABILIZING AIRMASS SOUTH OF WEDGE FRONT ACROSS THIS REGION...WITH WEAK LOW POSSIBLY DEVELOPING ALONG FRONT INVOF AGS. EXTENDING SWD FROM THIS WEAK LOW...A WIND SHIFT / CONVERGENCE AXIS IS INDICATED...WITH UPPER 60S TO LOW 70S DEWPOINTS AHEAD OF AND UPPER 50S TO LOW 60S DEWPOINTS BEHIND THIS AXIS. WITH 1500 TO 2000 J/KG SURFACE-BASED CAPE NOW INDICATED ACROSS THIS REGION...POTENTIAL FOR STORM DEVELOPMENT APPEARS TO EXIST OVER THE NEXT 1 TO 2 HOURS WITHIN LOW-LEVEL CONVERGENCE ZONES ALONG BOTH ERN GA WIND SHIFT AND WEDGE FRONT. LATEST VWP DATA ACROSS THIS REGION INDICATES MODERATE / VEERING DEEP-LAYER WIND FIELD SUPPORTIVE OF SUPERCELL STORMS. EXPECT ANY DEVELOPING STORMS TO BECOME SEVERE...WITH LOCALLY DAMAGING WINDS AND MARGINAL HAIL POSSIBLE. IN ADDITION...IT APPEARS THAT AN ISOLATED TORNADO THREAT EXISTS AS WELL...AS MEAN WIND WOULD SUGGEST ENEWD STORM MOVEMENT -- POTENTIALLY ALONG WEDGE FRONT AND ASSOCIATED BAROCLINIC VORTICITY AXIS. ..GOSS.. 04/12/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILM...CHS...CAE...JAX...FFC... 33668219 34168076 34597887 34317781 34027785 33757882 33127921 32128090 31418128 31658180 32978233
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 2:18 AM EDT | Mesoscale Discussion | SPC | Chatham, Effingham, Screven | 87 min |
| Apr 12, 2:25 PM EDT | Tornado Watch | SPC | Baldwin, Bleckley, Burke, Columbia, Emanuel, Glascock and 19 more | 6 hr |
| Apr 12, 2:33 PM EDT | Mesoscale Discussion | SPC | Calhoun, Chattahoochee, Clay, Decatur, Early, Miller and 5 more | 117 min |
| Apr 12, 3:10 PM EDT | Severe Thunderstorm Watch | SPC | Baker, Banks, Barrow, Bartow, Bibb, Butts and 58 more | 5 hr |
| Apr 12, 4:44 PM EDT | Mesoscale Discussion | SPC | Baldwin, Bleckley, Burke, Columbia, Dodge, Emanuel and 19 more | 91 min |
| Apr 12, 7:31 PM EDT | Mesoscale Discussion | SPC | Baker, Butts, Calhoun, Chattahoochee, Clay, Coweta and 21 more | 59 min |
| Apr 12, 7:50 PM EDT | Severe Thunderstorm Watch | SPC | Baker, Baldwin, Ben Hill, Berrien, Bibb, Bleckley and 67 more | 5 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.