Alert archive / Georgia / Mesoscale Discussions in 2004
Mesoscale Discussion 342
The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2004, 4:44 PM EDT for 25 counties in Georgia; 25 counties in South Carolina. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Apr 12, 2004, 4:44 PM EDT (20:44 UTC)
- Expired
- Apr 12, 2004, 6:15 PM EDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 50 counties
Baldwin County, GA, Bleckley County, GA, Burke County, GA, Columbia County, GA, Dodge County, GA, Emanuel County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Lincoln County, GA, McDuffie County, GA, Putnam County, GA, Richmond County, GA, Screven County, GA, Taliaferro County, GA, Treutlen County, GA, Twiggs County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Wilkinson County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Berkeley County, SC, Calhoun County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Edgefield County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, McCormick County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Williamsburg County, SC
The radar
The Columbia radar (KCAE), 87 km from the middle of the area, began a volume at 20:43 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, 8.7 hours before the alert went out and 181 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.
872 ACUS11 KWNS 122044 SWOMCD SPC MCD 122044 SCZ000-NCZ000-GAZ000-122215- MESOSCALE DISCUSSION 0342 NWS STORM PREDICTION CENTER NORMAN OK 0344 PM CDT MON APR 12 2004 AREAS AFFECTED...ERN GA / CENTRAL AND ERN SC CONCERNING...SEVERE THUNDERSTORM WATCH 70... VALID 122044Z - 122215Z SEVERE THREAT CONTINUES ACROSS WW AREA. STORMS HAVE BEEN SLOW TO DEVELOP ACROSS WW THIS AFTERNOON...APPARENTLY DUE TO WEAK SUBSIDENCE ASSOCIATED WITH SHORT-WAVE RIDGING IN THE WAKE OF VORT MAX NOW LIFTING NEWD ACROSS THE CENTRAL APPALACHIANS. NONETHELESS...UNSTABLE AIRMASS EXISTS SOUTH OF WEDGE FRONT...WHERE DEEP-LAYER WIND FIELD REMAINS SUPPORTIVE OF SEVERE STORMS / SUPERCELLS. ALTHOUGH IT APPEARS ATTM THAT MOST WIDESPREAD CONVECTIVE DEVELOPMENT OVER THE NEXT COUPLE OF HOURS SHOULD REMAIN WEST OF WW AREA /WITHIN WW 0071/...THREAT STILL EXISTS FOR A FEW ISOLATED SUPERCELLS ACROSS WW 0070. ..GOSS.. 04/12/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...RAH...ILM...CHS...CAE...GSP...FFC... 33528372 34727948 33327901 32138325
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, 1:52 PM EDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 7 more | 113 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, 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 Georgia, 2004Mesoscale Discussions in South 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.