Alert archive / Georgia / Mesoscale Discussions in 2004

Mesoscale Discussion 2268

September 27, 200434 counties in Georgia; 31 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2004, 10:27 AM EDT for 34 counties in Georgia; 31 counties in South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Sep 27, 2004, 10:27 AM EDT (14:27 UTC)
Expired
Sep 27, 2004, 12:30 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 65 counties

Baldwin County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Camden County, GA, Candler County, GA, Chatham County, GA, Columbia County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glascock County, GA, Glynn County, GA, Hancock County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Liberty County, GA, Lincoln County, GA, Long County, GA, McDuffie County, GA, McIntosh County, GA, Montgomery County, GA, Richmond County, GA, Screven County, GA, Taliaferro County, GA, Tattnall County, GA, Toombs County, GA, Treutlen County, GA, Warren County, GA, Washington County, GA, Wayne County, GA, Wilkinson County, GA, 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, Dorchester County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Greenwood County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, McCormick 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), 28 km from the middle of the area, began a volume at 14:31 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, 2.5 hours before the alert went out and 128 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 2004-09-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1064 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 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 2004-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.193958Sfc1 km3 km6 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
1064 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
509 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.7

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
Sep 27, 12:35 AM EDTTornado WatchSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 36 more8 hr
Sep 27, 4:47 AM EDTMesoscale DiscussionSPCAppling, Ben Hill, Bryan, Bulloch, Candler, Chatham and 15 more118 min
Sep 27, 7:38 AM EDTMesoscale DiscussionSPCBryan, Chatham, Effingham2 hr
Sep 27, 10:40 AM EDTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 12 more6 hr
Sep 27, 6:05 PM EDTMesoscale DiscussionSPCBanks, Franklin, Habersham, Hart, Madison, Rabun and 1 more115 min
Sep 26, 9:53 PM EDTMesoscale DiscussionSPCBeaufort, Berkeley, Charleston, Colleton, Dorchester, Hampton and 1 more2 hr
Sep 27, 3:24 PM EDTMesoscale DiscussionSPCBamberg, Berkeley, Calhoun, Chesterfield, Clarendon, Colleton and 15 more96 min
Sep 27, 3:50 PM EDTTornado WatchSPCBamberg, Berkeley, Calhoun, Charleston, Chesterfield, Clarendon and 17 more6 hr
Sep 27, 6:31 PM EDTMesoscale DiscussionSPCBerkeley, Calhoun, Chester, Chesterfield, Clarendon, Darlington and 16 more119 min

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.