Alert archive / Georgia / Mesoscale Discussions in 2003

Mesoscale Discussion 2239

August 24, 200339 counties in Georgia; 11 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Aug 24, 2003, 2:27 PM EDT for 39 counties in Georgia; 11 counties in South Carolina. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 24, 2003, 2:27 PM EDT (18:27 UTC)
Expired: Aug 24, 2003, 5:00 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 50 counties

Baldwin County, GA, Barrow County, GA, Bulloch County, GA, Burke County, GA, Butts County, GA, Candler County, GA, Clarke County, GA, Clayton County, GA, Columbia County, GA, DeKalb County, GA, Effingham County, GA, Emanuel County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Lincoln County, GA, McDuffie County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Putnam County, GA, Richmond County, GA, Rockdale County, GA, Screven County, GA, Taliaferro County, GA, Walton 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, Beaufort County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Edgefield County, SC, Hampton County, SC, Jasper County, SC

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 6.5 hours before the alert went out and 189 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: 107 J/kg
Mixed-layer CIN: -203 J/kg
Mixed-layer LCL: 1415 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 14 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.

213 
ACUS11 KWNS 241828
SWOMCD
SPC MCD 241827 
SCZ000-GAZ000-242100-

MESOSCALE DISCUSSION 2239
NWS STORM PREDICTION CENTER NORMAN OK
0127 PM CDT SUN AUG 24 2003

AREAS AFFECTED...NRN GA...SRN SC

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 241827Z - 242100Z

EXPECT STRONG AND PERHAPS A FEW SEVERE TSTMS ACROSS THE SOUTHEAST
THIS AFTERNOON. A WATCH IS NOT CURRENTLY ANTICIPATED DUE TO WEAK
STORM ORGANIZATION AND RANDOM NATURE OF MICROBURST THREAT.

THUNDERSTORMS ARE EXPECTED TO INCREASE ALONG THE SAVANNAH RIVER
BETWEEN ERN GA AND SRN SC...AND ALONG THE COAST OF SC OVER THE NEXT
HOUR OR SO. CONVECTIVE INITIATION WAS BEING AIDED BY SEVERAL
BOUNDARIES ACROSS THE REGION IN ADDITION TO RESIDUAL SYNOPTIC
FRONTAL ZONE. PRIMARY LOW LEVEL CONVERGENCE AXIS ACROSS ERN GA INTO
SRN SC APPEARS TO BE A RESULT OF DIFFERENTIAL HEATING OVER THE PAST
FEW HOURS WITH AN INFLECTION...OR BOUNDARY INTERSECTION...LOCATED
NEAR AGS. ANOTHER BOUNDARY INTERSECTION WAS RESULTING IN CONVECTIVE
DEVELOPMENT NORTH OF CHS WHERE DIFFERENTIAL HEATING BOUNDARY
INTERSECTS DEVELOPING SEABREEZE. STORMS DEVELOPING ON THESE
BOUNDARIES SHOULD MOVE GENERALLY SWWD INTO INCREASING INSTABILITY
ACROSS ERN/SERN GA GIVEN NWLY STEERING FLOW ON THE ERN PERIPHERY OF
CNTRL U.S. UPPER HIGH. DESPITE RELATIVELY HIGH CAPE...FCST SOUNDINGS
AND SHORT TERM MODEL DATA DO INDICATE RATHER WARM MID LEVEL
TEMPERATURES WHICH MAY TEND TO LIMIT UPDRAFT/DOWNDRAFT STRENGTH.
NONETHELESS...A FEW CELLS COULD PRODUCE ISOLATED STRONG TO DAMAGING
WET MICROBURSTS GIVEN THETAE DEFICITS APPROACHING 30C AND DCAPE
VALUES AROUND 1000 J/KG.

..CARBIN.. 08/24/2003

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

ATTN...WFO...CHS...CAE...GSP...FFC...

33728169 32867976 32348050 32348212 32938359 33468448
34088443 34308395

Nearby

Mesoscale Discussions in Georgia, 2003 Mesoscale Discussions in South 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.