Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 698

May 4, 200953 counties in Georgia; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 4, 2009, 2:23 PM EDT for 53 counties in Georgia; 13 counties in South Carolina. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
May 4, 2009, 2:23 PM EDT (18:23 UTC)
Expired
May 4, 2009, 3:30 PM EDT
In force
67 min
Issued by
the Storm Prediction Center
All 66 counties

Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Berrien County, GA, Bleckley County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Coffee County, GA, Colquitt County, GA, Columbia County, GA, Cook County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glascock County, GA, Houston County, GA, Irwin County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, Lee County, GA, Long County, GA, Macon County, GA, McDuffie County, GA, Mitchell County, GA, Montgomery County, GA, Pulaski County, GA, Richmond County, GA, Screven County, GA, Sumter County, GA, Tattnall County, GA, Telfair County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Turner County, GA, Twiggs County, GA, Warren County, GA, Washington County, GA, Wayne County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA, Worth County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Colleton County, SC, Dorchester County, SC, Edgefield County, SC, Hampton County, SC, Jasper County, SC, Lexington County, SC, Orangeburg County, SC, Richland County, SC

The radar

The Robins AFB radar (KJGX), 67 km from the middle of the area, began a volume at 18:24 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, 6.4 hours before the alert went out and 196 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 2009-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 71 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 2009-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 155 square meters per square second.1939587897Sfc1 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
71 J/kg
Mixed-layer CIN
-108 J/kg
Mixed-layer LCL
680 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
155 m²/s²
0-3 km storm-relative helicity
271 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 4, 2:30 AM EDTMesoscale DiscussionSPCChattahoochee, Clay, Lee, Macon, Marion, Muscogee and 8 more3 hr
May 4, 11:38 AM EDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 52 more67 min
May 4, 1:02 PM EDTSevere Thunderstorm WatchSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 51 more7 hr
May 4, 2:39 PM EDTSevere Thunderstorm WatchSPCBurke, Columbia, Emanuel, Glascock, Hancock, Jefferson and 10 more5 hr
May 4, 6:15 PM EDTMesoscale DiscussionSPCBulloch, Burke, Candler, Effingham, Jenkins, Screven60 min
May 4, 1:15 PM EDTMesoscale DiscussionSPCDillon, Horry, Marion, Marlboro60 min
May 4, 7:39 PM EDTSevere Thunderstorm WatchSPCBerkeley, Charleston, Colleton, Dillon, Dorchester, Florence and 4 more3 hr

Nearby

Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in South 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.