Alert archive / Georgia / Mesoscale Discussions in 2005

Mesoscale Discussion 721

April 30, 20056 states

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2005, 6:41 AM CDT for 6 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2005, 6:41 AM CDT (11:41 UTC)
Expired
Apr 30, 2005, 8:15 AM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 162 counties

Autauga County, AL, Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Chambers County, AL, Chilton County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Talladega County, AL, Tallapoosa County, AL, Washington County, AL, Wilcox County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Baldwin County, GA, Bartow County, GA, Ben Hill County, GA, Berrien County, GA, Bibb County, GA, Bleckley County, GA, Burke County, GA, Butts County, GA, Calhoun County, GA, Candler County, GA, Carroll County, GA, Chattahoochee County, GA, Clay County, GA, Clayton County, GA, Cobb County, GA, Coffee County, GA, Colquitt County, GA, Columbia County, GA, Cook County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, Decatur County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Douglas County, GA, Early County, GA, Emanuel County, GA, Fayette County, GA, Fulton County, GA, Glascock County, GA, Grady County, GA, Greene County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Irwin County, GA, Jasper County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Lee County, GA, Macon County, GA, Marion County, GA, McDuffie County, GA, Meriwether County, GA, Miller County, GA, Mitchell County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Paulding County, GA, Peach County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Richmond County, GA, Rockdale County, GA, Schley County, GA, Screven County, GA, Seminole County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Troup County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA, Worth County, GA, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Stone County, MS, Aiken County, SC, Allendale County, SC, Barnwell County, SC

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, 11.7 hours before the alert went out and 175 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 2005-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2005-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2071 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
165 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
ACUS11 KWNS 301141
SWOMCD
SPC MCD 301141 
SCZ000-GAZ000-FLZ000-ALZ000-MSZ000-LAZ000-301315-

MESOSCALE DISCUSSION 0721
NWS STORM PREDICTION CENTER NORMAN OK
0641 AM CDT SAT APR 30 2005

AREAS AFFECTED...GA....AL....SRN MS...SERN LA...WRN FL PNHDL

CONCERNING...TORNADO WATCH 215...

VALID 301141Z - 301315Z

EXTENSIVE PRE-FRONTAL SQUALL LINE WILL CONTINUE TO MOVE EAST AT UP
TO 50KT ACROSS PORTIONS OF NRN GA...SERN AL AND PARTS OF THE FL
PNHDL THIS MORNING. FARTHER SW...FROM SRN AL ACROSS SERN LA...EWD
MOTION OF THE LINE WILL BE SLOWER. LATEST MOTION ACROSS NRN SECTIONS
OF TORNADO WATCH 215 WOULD SUGGEST THAT A NEW WATCH MAY BE NEEDED
ACROSS PARTS OF GA...SERN AL...AND PERHAPS SC...IN LESS THAN 2
HOURS.

CONVECTION HAS TAKEN ON MORE OF A LINEAR STRUCTURE OVER THE LAST
COUPLE OF HOURS AS COLD POOLS HAVE MERGED AND FORCING ALONG THE
ADVANCING FRONT REMAINS QUITE STRONG. A POSSIBLE MESOLOW HAS EVOLVED
OVER CNTRL AL NEAR THE INTERSECTION OF NRN AND SRN SQUALL LINE
SEGMENTS. NUMEROUS SMALL SCALE BOWING SEGMENTS OF CONVECTION...SOME
MOVING AT OVER 50KT...WERE EMBEDDED WITHIN THE LARGER SCALE LINES
AND ARE LIKELY PRODUCING LOCALLY DAMAGING WINDS AT THIS TIME.

LOW LEVEL SLY FLOW OF 30-50KT AHEAD OF THE FRONT AND DEVELOPING
SQUALL LINE HAS RESULTED IN STRONG MOISTURE FLUX FROM THE WRN FL
PNHDL NEWD ACROSS GA AND SC THIS MORNING. OBJECTIVE ANALYSIS FIELDS
INDICATED THAT THE PRE-CONVECTIVE AIR MASS CONTINUES TO STEADILY
DESTABILIZE AHEAD OF THE LINE. THUS...EXPECT THREAT OF DAMAGING
WINDS AND/OR A COUPLE TORNADOES TO PERSIST EWD AS STRONG LARGE SCALE
AND MESOSCALE FORCING CONTINUE TO ACT ON VERY MOIST AND MODERATELY
UNSTABLE AIR MASS.

..CARBIN.. 04/30/2005

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

ATTN...WFO...CHS...CAE...JAX...FFC...TAE...BMX...MOB...JAN...LIX...

34508481 33888408 33668146 33308108 31788242 28308749
28478950 29719064 31958796

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 8:53 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 26 more97 min
Apr 29, 9:45 PM CDTTornado WatchSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more7 hr
Apr 30, 1:39 AM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more96 min
Apr 30, 2:40 AM CDTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Choctaw, Cullman and 16 more7 hr
Apr 30, 4:42 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bibb, Blount, Bullock, Butler and 43 more93 min
Apr 30, 5:05 AM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 25 more7 hr
Apr 30, 7:10 AM CDTSevere Thunderstorm WatchSPCDale, Geneva, Henry, Houston6 hr
Apr 30, 11:02 AM CDTMesoscale DiscussionSPCBaldwin, Covington, Escambia, Mobile58 min
Apr 30, 11:48 AM CDTMesoscale DiscussionSPCBaker, Columbia, Hamilton, Jefferson, Lafayette, Madison and 2 more27 min
Apr 30, 12:05 PM CDTSevere Thunderstorm WatchSPCBaker, Bay, Calhoun, Columbia, Franklin, Gadsden and 11 more5 hr
Apr 30, 8:40 AM CDTSevere Thunderstorm WatchSPCColumbia, Lincoln, Richmond6 hr
Apr 29, 10:55 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 8 more2 hr
Apr 30, 1:08 AM CDTMesoscale DiscussionSPCAvoyelles, Concordia, East Baton Rouge, East Feliciana, Iberville, Livingston and 8 more2 hr
Apr 29, 9:23 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Marshall97 min
Apr 30, 2:25 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Marshall95 min
Apr 30, 8:19 AM CDTMesoscale DiscussionSPCAbbeville, Aiken, Bamberg, Barnwell, Berkeley, Calhoun and 29 more26 min
Apr 30, 10:25 AM CDTMesoscale DiscussionSPCAllendale, Bamberg, Barnwell, Berkeley, Calhoun, Chesterfield and 14 more2 hr
Apr 30, 2:21 PM CDTMesoscale DiscussionSPCBerkeley, Georgetown, Horry54 min

Nearby

Mesoscale Discussions in Georgia, 2005Mesoscale Discussions in Alabama, 2005Mesoscale Discussions in Florida, 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.