Alert archive / South Carolina / Mesoscale Discussions in 2009

Mesoscale Discussion 730

May 6, 200923 counties in Georgia; Scotland County, North Carolina; 30 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 6, 2009, 8:47 AM EDT for 23 counties in Georgia; Scotland County, North Carolina; 30 counties in South Carolina. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
May 6, 2009, 8:47 AM EDT (12:47 UTC)
Expired
May 6, 2009, 10:15 AM EDT
In force
88 min
Issued by
the Storm Prediction Center
All 54 counties

Banks County, GA, Barrow County, GA, Clarke County, GA, Columbia County, GA, Elbert County, GA, Franklin County, GA, Greene County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Hart County, GA, Jackson County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Oconee County, GA, Oglethorpe County, GA, Richmond County, GA, Stephens County, GA, Taliaferro County, GA, Walton County, GA, Warren County, GA, Wilkes County, GA, Scotland County, NC, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chester County, SC, Chesterfield County, SC, Darlington County, SC, Edgefield County, SC, Fairfield County, SC, Greenville County, SC, Greenwood County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marlboro County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Orangeburg County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 73 km from the middle of the area, began a volume at 12:51 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 0.8 hours before the alert went out and 213 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, Peachtre/Fal Fld, GA at 12:00Z on 2009-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 749 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, Peachtre/Fal Fld, GA at 12:00Z on 2009-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 125 square meters per square second.193958Sfc1 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
749 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
526 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
125 m²/s²
0-3 km storm-relative helicity
149 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.6

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 6, 5:03 AM EDTSevere Thunderstorm WatchSPCBartow, Catoosa, Chattooga, Dade, Floyd, Gordon and 6 more6 hr
May 6, 8:22 AM EDTMesoscale DiscussionSPCChattooga, Dade, Floyd, Haralson, Polk83 min
May 6, 10:04 AM EDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Carroll, Chattooga, Cherokee and 36 more56 min
May 6, 10:27 AM EDTTornado WatchSPCBaldwin, Banks, Barrow, Bartow, Bibb, Butts and 75 more9 hr
May 6, 2:57 PM EDTMesoscale DiscussionSPCBarrow, Bibb, Butts, Chattahoochee, Clarke, Crawford and 31 more93 min
May 6, 5:47 PM EDTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Bryan, Bulloch, Burke and 47 more58 min
May 5, 8:43 PM EDTMesoscale DiscussionSPCAnson, Bertie, Chatham, Chowan, Cumberland, Durham and 30 more62 min
May 6, 11:40 AM EDTMesoscale DiscussionSPCAlamance, Anson, Cabarrus, Caswell, Chatham, Cleveland and 32 more2 hr
May 6, 2:16 PM EDTTornado WatchSPCAlamance, Alexander, Anson, Bertie, Buncombe, Burke and 52 more6 hr
May 6, 7:29 PM EDTMesoscale DiscussionSPCAlamance, Anson, Bertie, Cabarrus, Caswell, Chatham and 40 more91 min

Nearby

Mesoscale Discussions in South Carolina, 2009Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in North Carolina, 2009Every mesoscale discussion in 2009

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.