Alert archive / Georgia / Mesoscale Discussions in 2008

Mesoscale Discussion 877

May 11, 200838 counties in Alabama; 99 counties in Georgia; 8 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 11, 2008, 1:06 AM CDT for 38 counties in Alabama; 99 counties in Georgia; 8 counties in South Carolina. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
May 11, 2008, 1:06 AM CDT (06:06 UTC)
Expired
May 11, 2008, 2:30 AM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 145 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Cullman County, AL, DeKalb County, AL, Elmore County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lawrence County, AL, Lee County, AL, Limestone County, AL, Macon County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Montgomery County, AL, Morgan County, AL, Perry County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Baldwin County, GA, Banks County, GA, Barrow County, GA, Bartow County, GA, Bibb County, GA, Bleckley County, GA, Bulloch County, GA, Burke County, GA, Butts County, GA, Candler County, GA, Carroll County, GA, Chattahoochee County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Columbia County, GA, Coweta County, GA, Crawford County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Douglas County, GA, Effingham County, GA, Elbert County, GA, Emanuel County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Glascock County, GA, Gordon County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Lincoln County, GA, Lumpkin County, GA, Macon County, GA, Madison County, GA, Marion County, GA, McDuffie County, GA, Meriwether County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Peach County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Richmond County, GA, Rockdale County, GA, Schley County, GA, Screven County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Toombs County, GA, Treutlen County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walker County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, Whitfield County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Edgefield County, SC, Hampton County, SC, Jasper County, SC, McCormick County, SC

The radar

The Atlanta radar (KFFC), 73 km from the middle of the area, began a volume at 06:08 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, 6.1 hours before the alert went out and 79 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 2008-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1834 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 00:00Z on 2008-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 square meters per square second.1939587897117Sfc1 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
1834 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
852 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
226 m²/s²
Significant tornado parameter
2.1
Supercell composite
11.1

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 10, 7:08 PM CDTTornado WatchSPCBlount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 23 more7 hr
May 10, 9:21 PM CDTMesoscale DiscussionSPCBlount, Colbert, Cullman, Etowah, Fayette, Franklin and 12 more84 min
May 10, 11:32 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 15 more118 min
May 11, 1:37 AM CDTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more7 hr
May 11, 3:40 AM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Chambers, Chilton and 14 more95 min
May 11, 4:52 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston8 hr
May 11, 6:24 AM CDTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Clay, Coosa, Dale and 9 more96 min
May 11, 7:51 AM CDTMesoscale DiscussionSPCBarbour, Chambers, Dale, Henry, Houston, Lee and 1 more84 min
May 10, 7:14 PM CDTMesoscale DiscussionSPCAppling, Baldwin, Bibb, Bleckley, Bryan, Bulloch and 77 more2 hr
May 10, 8:54 PM CDTMesoscale DiscussionSPCAppling, Bacon, Baldwin, Ben Hill, Bibb, Bleckley and 88 more96 min
May 10, 9:06 PM CDTTornado WatchSPCAppling, Bacon, Baldwin, Banks, Barrow, Bartow and 112 more7 hr
May 11, 4:38 AM CDTMesoscale DiscussionSPCAtkinson, Bacon, Baker, Berrien, Brantley, Brooks and 27 more67 min
May 11, 5:13 AM CDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 62 more92 min
May 11, 11:15 AM CDTMesoscale DiscussionSPCAtkinson, Baker, Berrien, Brooks, Calhoun, Camden and 21 more60 min
May 11, 1:24 PM CDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Berrien, Brantley, Brooks and 20 more66 min
May 11, 1:42 PM CDTTornado WatchSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 29 more5 hr
May 11, 3:43 PM CDTMesoscale DiscussionSPCAtkinson, Bacon, Brantley, Brooks, Bryan, Camden and 15 more2 hr
May 11, 6:06 PM CDTMesoscale DiscussionSPCBryan, Chatham, Effingham, Liberty, Long, McIntosh84 min
May 11, 12:39 PM CDTMesoscale DiscussionSPCCalhoun, Chester, Chesterfield, Darlington, Dillon, Fairfield and 9 more2 hr
May 11, 1:07 PM CDTTornado WatchSPCChester, Chesterfield, Darlington, Dillon, Fairfield, Florence and 5 more6 hr
May 11, 3:43 PM CDTTornado WatchSPCHorry6 hr
May 11, 6:30 PM CDTMesoscale DiscussionSPCHorry90 min

Nearby

Mesoscale Discussions in Georgia, 2008Mesoscale Discussions in Alabama, 2008Mesoscale Discussions in South Carolina, 2008Every 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.