Alert archive / Georgia / Mesoscale Discussions in 2008

Mesoscale Discussion 951

May 20, 200844 counties in Georgia; 16 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 20, 2008, 2:23 PM EDT for 44 counties in Georgia; 16 counties in South Carolina. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: May 20, 2008, 2:23 PM EDT (18:23 UTC)
Expired: May 20, 2008, 3:30 PM EDT
In force: 67 min
Issued by: the Storm Prediction Center

All 60 counties

Baldwin County, GA, Bibb County, GA, Burke County, GA, Butts County, GA, Clayton County, GA, Columbia County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Henry County, GA, Jasper County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Lincoln County, GA, McDuffie County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Pike County, GA, Putnam County, GA, Richmond County, GA, Rockdale County, GA, Screven County, GA, Spalding County, GA, Talbot County, GA, Taliaferro County, GA, Upson 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, Calhoun County, SC, Clarendon County, SC, Edgefield County, SC, Hampton County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, McCormick County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC

The radar

The Robins AFB radar (KJGX), 127 km from the middle of the area, began a volume at 18:25 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 191 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: 572 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 979 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 225 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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.

Issued	Product	Office	Counties	Lasted
May 20, 2:59 PM EDT	Severe Thunderstorm Watch	SPC	Baldwin, Banks, Barrow, Bartow, Burke, Butts and 70 more	7 hr
May 20, 3:39 PM EDT	Tornado Watch	SPC	Jenkins, Screven	7 hr
May 20, 7:19 PM EDT	Mesoscale Discussion	SPC	Baldwin, Banks, Barrow, Butts, Carroll, Clarke and 45 more	86 min
May 20, 3:23 PM EDT	Mesoscale Discussion	SPC	Allendale, Berkeley, Charleston, Clarendon, Colleton, Dorchester and 5 more	37 min

Nearby

Mesoscale Discussions in Georgia, 2008 Mesoscale Discussions in South Carolina, 2008 Every mesoscale discussion in 2008

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.