Alert archive / Georgia / Mesoscale Discussions in 2005

Mesoscale Discussion 927

May 20, 200524 counties in Georgia; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 20, 2005, 5:52 AM EDT for 24 counties in Georgia; 13 counties in South Carolina. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
May 20, 2005, 5:52 AM EDT (09:52 UTC)
Expired
May 20, 2005, 6:45 AM EDT
In force
53 min
Issued by
the Storm Prediction Center
All 37 counties

Baldwin County, GA, Bleckley County, GA, Burke County, GA, Candler County, GA, Columbia County, GA, Emanuel County, GA, Glascock County, GA, Hancock County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Laurens County, GA, Lincoln County, GA, McDuffie County, GA, Richmond County, GA, Screven County, GA, Taliaferro County, GA, Treutlen County, GA, Twiggs 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, Edgefield 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), 117 km from the middle of the area, began a volume at 09:51 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 00:00Z, 9.9 hours before the alert went out and 206 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 00:00Z on 2005-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1236 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2005-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.1939Sfc1 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
1236 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1610 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.1

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 20, 2:00 AM EDTSevere Thunderstorm WatchSPCHart7 hr
May 20, 2:30 AM EDTSevere Thunderstorm WatchSPCBanks, Barrow, Catoosa, Cherokee, Dade, Dawson and 20 more8 hr
May 20, 5:18 AM EDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 26 more57 min
May 20, 8:42 AM EDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 36 more93 min
May 20, 9:40 AM EDTSevere Thunderstorm WatchSPCAppling, Baldwin, Banks, Barrow, Bartow, Bibb and 86 more7 hr
May 20, 1:16 PM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 11 more29 min
May 20, 1:20 PM EDTSevere Thunderstorm WatchSPCAppling, Bacon, Bryan, Bulloch, Burke, Candler and 15 more7 hr
May 20, 1:55 PM EDTMesoscale DiscussionSPCAppling, Bacon, Baldwin, Banks, Barrow, Bartow and 94 more65 min
May 20, 2:43 PM EDTMesoscale DiscussionSPCAppling, Bacon, Bryan, Bulloch, Burke, Candler and 14 more62 min
May 20, 4:10 PM EDTSevere Thunderstorm WatchSPCBaker, Ben Hill, Berrien, Bleckley, Brooks, Calhoun and 41 more8 hr
May 20, 4:40 PM EDTMesoscale DiscussionSPCAppling, Bacon, Bryan, Bulloch, Candler, Chatham and 10 more95 min
May 20, 7:44 PM EDTMesoscale DiscussionSPCBaker, Ben Hill, Berrien, Bleckley, Brooks, Calhoun and 50 more91 min
May 20, 12:56 AM EDTMesoscale DiscussionSPCCherokee, Greenville, Pickens, Spartanburg, York2 hr
May 20, 12:58 AM EDTMesoscale DiscussionSPCCherokee, Greenville, Pickens, Spartanburg, York2 hr

Nearby

Mesoscale Discussions in Georgia, 2005Mesoscale Discussions in South Carolina, 2005Every mesoscale discussion in 2005

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.