Alert archive / Georgia / Mesoscale Discussions in 2003

Mesoscale Discussion 818

May 7, 200326 counties in Alabama; 64 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at May 7, 2003, 10:24 AM CDT for 26 counties in Alabama; 64 counties in Georgia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2003, 10:24 AM CDT (15:24 UTC)
Expired
May 7, 2003, 12:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 90 counties

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, Elmore County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lee County, AL, Marshall County, AL, Randolph 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, Bartow County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Carroll County, GA, Chattahoochee County, GA, Clayton County, GA, Cobb County, GA, Columbia County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Dodge County, GA, Douglas County, GA, Emanuel County, GA, Fayette County, GA, Floyd County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Macon 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, Paulding County, GA, Peach County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Treutlen County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wilkinson County, GA

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 3.4 hours before the alert went out and 101 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, Birmingham, AL at 12:00Z on 2003-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1457 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, Birmingham, AL at 12:00Z on 2003-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 178 square meters per square second.19395878Sfc1 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
1457 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
538 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
236 m²/s²
Significant tornado parameter
1.3
Supercell composite
6.5

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, 11:32 PM CDTMesoscale DiscussionSPCJackson, Limestone, Madison88 min
May 6, 11:50 PM CDTTornado WatchSPCColbert, Lauderdale, Lawrence, Limestone, Madison, Morgan6 hr
May 7, 1:41 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Lawrence, Limestone, Madison and 1 more3 hr
May 7, 4:55 AM CDTTornado WatchSPCLauderdale6 hr
May 7, 7:06 AM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 8 more114 min
May 7, 7:35 AM CDTTornado WatchSPCBlount, Colbert, Cullman, Fayette, Franklin, Greene and 16 more5 hr
May 7, 10:35 AM CDTTornado WatchSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 23 more5 hr
May 7, 10:50 AM CDTTornado WatchSPCSumter5 hr
May 7, 1:42 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 14 more2 hr
May 7, 2:30 PM CDTTornado WatchSPCRussell6 hr
May 7, 3:00 PM CDTTornado WatchSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 30 more6 hr
May 7, 6:29 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 32 more91 min
May 7, 1:16 AM CDTMesoscale DiscussionSPCFannin, Lumpkin, Towns, Union, White3 hr

Nearby

Mesoscale Discussions in Georgia, 2003Mesoscale Discussions in Alabama, 2003Every mesoscale discussion in 2003

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.