Alert archive / South Carolina / Mesoscale Discussions in 2003

Mesoscale Discussion 793

May 6, 2003Effingham County, Screven County, Georgia; 6 counties in North Carolina; 33 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 2:18 PM EDT for Effingham County, Screven County, Georgia; 6 counties in North Carolina; 33 counties in South Carolina. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
May 6, 2003, 2:18 PM EDT (18:18 UTC)
Expired
May 6, 2003, 4:15 PM EDT
In force
117 min
Issued by
the Storm Prediction Center
All 41 counties

Effingham County, GA, Screven County, GA, Bladen County, NC, Brunswick County, NC, Columbus County, NC, Pender County, NC, Robeson County, NC, Scotland 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, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Williamsburg County, SC

The radar

The Columbia radar (KCAE), 68 km from the middle of the area, began a volume at 18:22 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, 6.3 hours before the alert went out and 117 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 2003-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 870 joules per kilogram.LCLLFCEL10008507005003002001001 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 2003-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.19395878Sfc1 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
870 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
821 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.5
Supercell composite
4.3

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
May 5, 8:53 PM EDTMesoscale DiscussionSPCBartow, Carroll, Chattooga, Cherokee, Cobb, Dade and 9 more2 hr
May 5, 9:30 PM EDTTornado WatchSPCBaldwin, Barrow, Bibb, Butts, Carroll, Clarke and 43 more8 hr
May 5, 11:27 PM EDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Butts, Carroll, Cherokee and 34 more2 hr
May 6, 1:55 AM EDTTornado WatchSPCBurke, Columbia, Jefferson, Lincoln, McDuffie, Richmond6 hr
May 6, 2:50 AM EDTTornado WatchSPCChattooga, Dade6 hr
May 6, 2:53 AM EDTMesoscale DiscussionSPCBaldwin, Barrow, Butts, Carroll, Clarke, Clayton and 40 more2 hr
May 6, 6:06 AM EDTMesoscale DiscussionSPCChattooga, Dade3 hr
May 6, 6:23 AM EDTMesoscale DiscussionSPCBurke, Columbia, Jefferson, McDuffie, Richmond2 hr
May 6, 8:40 AM EDTTornado WatchSPCChattooga, Dade, Walker5 hr
May 6, 10:45 AM EDTSevere Thunderstorm WatchSPCBanks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 41 more5 hr
May 6, 11:26 AM EDTMesoscale DiscussionSPCChattooga, Dade2 hr
May 6, 1:15 PM EDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Butts, Carroll, Chattooga and 50 more90 min
May 6, 1:30 PM EDTTornado WatchSPCBaldwin, Banks, Barrow, Bartow, Burke, Butts and 59 more7 hr
May 6, 4:41 PM EDTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bartow, Bibb, Burke and 60 more2 hr
May 5, 11:05 PM EDTMesoscale DiscussionSPCAiken, Berkeley, Calhoun, Chester, Chesterfield, Clarendon and 17 more3 hr
May 6, 2:40 PM EDTTornado WatchSPCAiken, Allendale, Bamberg, Barnwell, Berkeley, Calhoun and 20 more5 hr

Nearby

Mesoscale Discussions in South Carolina, 2003Mesoscale Discussions in North Carolina, 2003Mesoscale Discussions in Georgia, 2003Every 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; radar from the NEXRAD Level II archive.