Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 2131

September 5, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2011, 11:01 AM CDT for 4 states. It was in force for 29 min.

The area

The outline as issued.

The facts

Issued
Sep 5, 2011, 11:01 AM CDT (16:01 UTC)
Expired
Sep 5, 2011, 11:30 AM CDT
In force
29 min
Issued by
the Storm Prediction Center
All 159 counties

Autauga County, AL, Baldwin County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Choctaw 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, Etowah County, AL, Geneva County, AL, Hale County, AL, Henry County, AL, Houston County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Washington County, AL, Wilcox County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Baldwin County, GA, Barrow County, GA, Bartow County, GA, Ben Hill County, GA, Berrien County, GA, Bibb County, GA, Bleckley County, GA, Brooks County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clay County, GA, Clayton County, GA, Cobb County, GA, Colquitt County, GA, Cook County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, Dawson County, GA, Decatur County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Douglas County, GA, Early County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gordon County, GA, Grady County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Irwin County, GA, Jackson County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Miller County, GA, Mitchell County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Paulding County, GA, Peach County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Seminole County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Troup County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Webster County, GA, Wilcox County, GA, Wilkinson County, GA, Worth County, GA, George County, MS, Greene County, MS, Jackson County, MS, Stone 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.0 hours before the alert went out and 170 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, Tallahassee Rgnl, FL at 12:00Z on 2011-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2763 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, Tallahassee Rgnl, FL at 12:00Z on 2011-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 square meters per square second.193958Sfc1 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
2763 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
465 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
266 m²/s²
Significant tornado parameter
2.6
Supercell composite
17.8

Open this sounding in Storm Lab

The text

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

415 
ACUS11 KWNS 051601
SWOMCD
SPC MCD 051601 
GAZ000-FLZ000-ALZ000-MSZ000-051630-

MESOSCALE DISCUSSION 2131
NWS STORM PREDICTION CENTER NORMAN OK
1101 AM CDT MON SEP 05 2011

AREAS AFFECTED...SERN-EAST CENTRAL MS/SRN AND CENTRAL AL/FL
PANHANDLE/PARTS OF WRN AND CENTRAL GA

CONCERNING...TORNADO WATCH 838...

VALID 051601Z - 051630Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 838 CONTINUES.

A NEW TORNADO WATCH WILL BE COORDINATED SOON FOR PARTS OF WRN AND
CENTRAL GA...AS THE ONGOING TORNADO THREAT ACROSS VALID PARTS OF WW
838 DEVELOPS/EXPANDS ENEWD THIS AFTERNOON.

15Z MESOSCALE ANALYSIS AND SATELLITE/RADAR IMAGERY SHOWED THE
REMNANT CENTER OF LEE LOCATED OVER SERN MS...WITH A SECOND AREA OF
LOW PRESSURE OVER SWRN-W CENTRAL AL.  THIS LATTER LOW WAS LOCATED
ALONG A BAROCLINIC ZONE WHICH EXTENDED NEWD FROM THE SERN LOW CENTER
THROUGH WRN TO NERN AL...INTO FAR NWRN GA TO ALONG THE TN/NC
BORDER...AND FARTHER NEWD INTO WRN VA.  DIABATIC HEATING IS
SUPPORTING SUFFICIENT DESTABILIZATION INTO THE AFTERNOON FROM WW 838
INTO PARTS OF WRN/CENTRAL GA AND PARTS OF NWRN FL.  AS THE SERN MS
LOW TRACKS NEWD TODAY...50 KT SLY LLJ WILL TRANSLATE EWD RESULTING
IN AN INCREASE IN LOW LEVEL SHEAR/SRH FOR AN ENHANCED TORNADO
THREAT.

MEANWHILE...EXTENSIVE CLOUDS N OF THE REMNANT LOW IN MUCH OF ERN MS
AND N OF THE BAROCLINIC ZONE INTO NRN AL WILL LIMIT THE SEVERE
WEATHER THREAT ACROSS THESE AREAS...AND AS SUCH AFFECTED COUNTIES
HAVE BEEN REMOVED FROM WW 838.

..PETERS.. 09/05/2011

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

ATTN...WFO...JAX...FFC...TAE...BMX...HUN...MOB...JAN...LIX...

LAT...LON   30048826 30758918 32008855 32828781 34148642 34638504
            34378370 34058320 32978303 31638299 30738334 30418352
            29828368 29458438 29288523 29708603 29938645 29828814
            30048826

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 4, 9:42 PM CDTTornado WatchSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 16 more9 hr
Sep 4, 11:35 PM CDTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Conecuh, Covington, Escambia and 6 more115 min
Sep 5, 4:26 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 41 more94 min
Sep 5, 5:35 AM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Blount, Bullock and 50 more10 hr
Sep 5, 7:24 AM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 20 more66 min
Sep 5, 3:04 PM CDTSevere Thunderstorm WatchSPCCoffee, Dale, Geneva, Henry, Houston6 hr
Sep 5, 3:15 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Coffee, Dale, Elmore and 9 more30 min
Sep 5, 3:49 PM CDTTornado WatchSPCAutauga, Barbour, Bullock, Calhoun, Chambers, Chilton and 16 more4 hr
Sep 5, 6:37 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Calhoun, Chambers, Clay, Cleburne and 9 more113 min
Sep 5, 5:24 PM CDTMesoscale DiscussionSPCAlachua, Baker, Columbia, Gilchrist, Hamilton, Levy and 1 more66 min
Sep 5, 11:10 AM CDTTornado WatchSPCBartow, Bibb, Butts, Carroll, Chattahoochee, Chattooga and 46 more4 hr
Sep 5, 12:23 PM CDTMesoscale DiscussionSPCBaldwin, Burke, Columbia, Elbert, Emanuel, Glascock and 17 more67 min
Sep 5, 2:05 PM CDTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 75 more55 min
Sep 5, 2:42 PM CDTTornado WatchSPCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 81 more7 hr
Sep 5, 4:48 PM CDTMesoscale DiscussionSPCAppling, Bacon, Brantley, Bryan, Bulloch, Camden and 19 more87 min
Sep 5, 5:12 PM CDTSevere Thunderstorm WatchSPCBurke, Richmond4 hr

Nearby

Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Alabama, 2011Mesoscale Discussions in Florida, 2011Every mesoscale discussion in 2011

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.