Alert archive / Georgia / Mesoscale Discussions in 2003

Mesoscale Discussion 830

May 7, 200338 counties in Alabama; 58 counties in Georgia; 6 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 7, 2003, 6:29 PM CDT for 38 counties in Alabama; 58 counties in Georgia; 6 counties in Mississippi. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
May 7, 2003, 6:29 PM CDT (23:29 UTC)
Expired
May 7, 2003, 8:00 PM CDT
In force
91 min
Issued by
the Storm Prediction Center
All 102 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Crenshaw County, AL, Dallas County, AL, Elmore County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Washington County, AL, Wilcox County, AL, Baldwin County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Carroll County, GA, Chattahoochee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Dooly County, GA, Douglas County, GA, Fayette County, GA, Fulton County, GA, Greene County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe 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, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wilkes County, GA, Wilkinson County, GA, Clarke County, MS, Jasper County, MS, Lauderdale County, MS, Lowndes County, MS, Newton County, MS, Wayne County, MS

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, 11.5 hours before the alert went out and 84 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.

700 
ACUS11 KWNS 072330
SWOMCD
SPC MCD 072329 
GAZ000-ALZ000-MSZ000-080100-

MESOSCALE DISCUSSION 0830
NWS STORM PREDICTION CENTER NORMAN OK
0629 PM CDT WED MAY 07 2003

AREAS AFFECTED...CENTRAL-SRN AL/CENTRAL GA/PORTIONS OF CENTRAL MS

CONCERNING...TORNADO WATCH 287...288...

VALID 072329Z - 080100Z

PARAMETERS REMAIN FAVORABLE FOR SEVERE STORMS PRODUCING TORNADOES
FROM PORTIONS OF CENTRAL-SRN AL INTO CENTRAL GA.

REGIONAL RADARS SHOW STRONG TO SEVERE STORMS FROM CENTRAL AL /JUST
SOUTH OF BHM/ EWD INTO WEST CENTRAL GA AT FULTON/COWETA COUNTIES. 
SURFACE MESOANALYSIS SHOWS A WELL DEFINED MESO-HIGH IN THE WAKE OF
THESE STORMS...WITH PRESSURE FALLS OVER EAST CENTRAL-SERN AL AND
WEST CENTRAL-SWRN GA...SUPPORTING BACKED S TO SELY SURFACE WINDS TO
THE SOUTH OF THE ONGOING STORMS.  STORMS WILL CONTINUE TO MOVE ESEWD
INTO SRN AL AND CENTRAL GA OVER THE NEXT SEVERAL HOURS... WHERE THE
AIR MASS REMAINS MODERATELY UNSTABLE.  GIVEN THE DEGREE OF
INSTABILITY COMBINED WITH STRONG DEEP LAYER SHEAR AND LOW-LEVEL
SHEAR FROM THE BACKED SURFACE WINDS...TORNADOES WITH LARGE HAIL WILL
CONTINUE TO BE A THREAT INTO THE EVENING.

ADDITIONAL STORMS HAVE DEVELOPED WWD ALONG THE INSTABILITY AXIS INTO
CENTRAL MS TO AROUND JAN.  ALTHOUGH THIS AIR MASS WAS UNCAPPED PER
JAN 18Z SOUNDING...VIS IMAGERY SHOWS A N-S ORIENTED  OUTFLOW
BOUNDARY FROM EARLIER CONVECTION HAS MOVED WWD INTO CENTRAL
MS...SUGGESTING CURRENT STORMS MAY BE ELEVATED.  

..PETERS.. 05/07/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FFC...TAE...BMX...MOB...JAN...

34218451 33918399 33908265 32338267 31808544 31368851
32328970 32788849 33538848

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, 10:24 AM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 20 more2 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, 1:16 AM CDTMesoscale DiscussionSPCFannin, Lumpkin, Towns, Union, White3 hr
May 6, 7:15 PM CDTSevere Thunderstorm WatchSPCAdams, Attala, Carroll, Choctaw, Claiborne, Clarke and 36 more5 hr
May 6, 9:53 PM CDTMesoscale DiscussionSPCAttala, Carroll, Chickasaw, Choctaw, Claiborne, Clarke and 32 more97 min
May 7, 2:27 AM CDTMesoscale DiscussionSPCAttala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 36 more3 hr
May 7, 9:47 AM CDTMesoscale DiscussionSPCAdams, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 25 more118 min
May 7, 1:54 PM CDTMesoscale DiscussionSPCAttala, Carroll, Choctaw, Claiborne, Clay, Hinds and 23 more2 hr

Nearby

Mesoscale Discussions in Georgia, 2003Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Mississippi, 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.