Alert archive / Georgia / Mesoscale Discussions in 2012

Mesoscale Discussion 464

April 5, 2012Geneva County, Henry County, Houston County, Alabama; 11 counties in Florida; 39 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2012, 3:49 PM CDT for Geneva County, Henry County, Houston County, Alabama; 11 counties in Florida; 39 counties in Georgia. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Apr 5, 2012, 3:49 PM CDT (20:49 UTC)
Expired
Apr 5, 2012, 5:15 PM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 53 counties

Geneva County, AL, Henry County, AL, Houston County, AL, Calhoun County, FL, Escambia County, FL, Gadsden County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Atkinson County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lee County, GA, Macon County, GA, Miller County, GA, Mitchell County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Webster County, GA, Wilcox County, GA, Worth County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.8 hours before the alert went out and 106 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 2012-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 71 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 2012-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
71 J/kg
Mixed-layer CIN
-397 J/kg
Mixed-layer LCL
1087 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
61 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.

882 
ACUS11 KWNS 052050
SWOMCD
SPC MCD 052049
GAZ000-FLZ000-ALZ000-052215-

MESOSCALE DISCUSSION 0464
NWS STORM PREDICTION CENTER NORMAN OK
0349 PM CDT THU APR 05 2012

AREAS AFFECTED...GA...NRN FL

CONCERNING...SEVERE THUNDERSTORM WATCH 143...148...

VALID 052049Z - 052215Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
143...148...CONTINUES.

REMAINING VALID PORTION OF WW 143 LIKELY WILL BE ALLOWED TO EXPIRE
AT 22Z.

AN EAST SOUTHEASTWARD ADVANCING CONVECTIVE OUTFLOW BOUNDARY REMAINS
THE FOCUS FOR OCCASIONAL VIGOROUS STORM DEVELOPMENT IN THE PRESENCE
OF STRONG DEEP LAYER SHEAR SUFFICIENT FOR UPDRAFT ROTATION...AND
WEAK TO MODERATE CAPE.  HOWEVER...THE ASSOCIATED LOWER/MID
TROPOSPHERIC CYCLONIC CIRCULATION HAS WEAKENED ACROSS EAST CENTRAL
ALABAMA/WEST CENTRAL GEORGIA.  IT IS NOT CLEAR THAT THERE WILL BE
SUBSTANTIVE FURTHER CONVECTIVE INTENSIFICATION LATE THIS AFTERNOON
INTO EARLY EVENING...BUT LATEST OBJECTIVE ANALYSIS SUGGESTS A
CORRIDOR OF GREATER INSTABILITY MAY EXIST SOUTH OF COLUMBUS INTO
AREAS OF SOUTH CENTRAL GEORGIA TO THE SOUTH OF MACON ...WHICH MAY
PROVIDE A FOCUS FOR ISOLATED STRONG/SEVERE STORM DEVELOPMENT THROUGH
23-00Z.

..KERR.. 04/05/2012

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

ATTN...WFO...JAX...FFC...TAE...BMX...MOB...

LAT...LON   30778765 30938648 31438539 31988498 32338464 32438390
            32328315 31908247 31348260 30998292 30448417 30188489
            30068533 30398593 30408731 30778765

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 5, 7:36 AM CDTMesoscale DiscussionSPCChoctaw, Greene, Hale, Marengo, Perry, Pickens and 2 more54 min
Apr 5, 9:14 AM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Bullock, Butler, Chambers and 34 more8 hr
Apr 5, 10:41 AM CDTMesoscale DiscussionSPCAutauga, Bibb, Butler, Chilton, Choctaw, Clarke and 15 more94 min
Apr 5, 12:09 PM CDTMesoscale DiscussionSPCColbert, Cullman, Franklin, Lauderdale, Lawrence, Limestone and 4 more96 min
Apr 5, 1:12 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Clay, Coffee, Covington and 11 more93 min
Apr 5, 1:21 PM CDTSevere Thunderstorm WatchSPCColbert, DeKalb, Franklin, Jackson, Lauderdale, Lawrence and 4 more8 hr
Apr 5, 1:58 PM CDTSevere Thunderstorm WatchSPCCoffee, Dale, Geneva, Henry, Houston6 hr
Apr 5, 3:06 PM CDTMesoscale DiscussionSPCColbert, DeKalb, Franklin, Jackson, Lauderdale, Lawrence and 4 more54 min
Apr 5, 3:46 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cullman, Etowah, Fayette, Jefferson and 7 more59 min
Apr 5, 6:14 PM CDTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Bullock, Calhoun, Chambers and 21 more3 hr
Apr 5, 6:15 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Bullock, Calhoun, Chambers and 23 more45 min
Apr 4, 9:03 PM CDTMesoscale DiscussionSPCCharlotte, Collier, DeSoto, Hillsborough, Lee, Manatee and 2 more57 min
Apr 5, 1:10 AM CDTMesoscale DiscussionSPCMiami-Dade, Monroe3 hr
Apr 5, 12:03 PM CDTMesoscale DiscussionSPCBanks, Burke, Clarke, Columbia, Effingham, Elbert and 24 more87 min
Apr 5, 12:47 PM CDTSevere Thunderstorm WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 17 more7 hr
Apr 5, 12:54 PM CDTMesoscale DiscussionSPCBartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 11 more96 min
Apr 5, 2:37 PM CDTMesoscale DiscussionSPCBurke, Chatham, Columbia, Effingham, Elbert, Franklin and 11 more53 min
Apr 5, 5:35 PM CDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 12 more85 min

Nearby

Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in Florida, 2012Mesoscale Discussions in Alabama, 2012Every mesoscale discussion in 2012

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.