Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 293

March 27, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2011, 10:51 AM CDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Mar 27, 2011, 10:51 AM CDT (15:51 UTC)
Expired
Mar 27, 2011, 12:15 PM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 91 counties

Barbour County, AL, Coffee County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Pike County, AL, Bay County, FL, Calhoun County, FL, Gadsden County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Walton County, FL, Washington County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Bleckley County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Calhoun County, GA, Candler County, GA, Chatham County, GA, Chattahoochee County, GA, Clay County, GA, Clinch 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, Echols County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Grady County, GA, Houston County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Laurens County, GA, Lee County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, Macon County, GA, Marion County, GA, McIntosh County, GA, Miller County, GA, Mitchell County, GA, Montgomery County, GA, Peach County, GA, Pierce County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Tattnall County, GA, Taylor County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Turner County, GA, Ware County, GA, Wayne County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Worth County, GA, Beaufort County, SC, Jasper County, SC

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.9 hours before the alert went out and 116 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 2011-03-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1068 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 2011-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 174 square meters per square second.1939587897Sfc1 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
1068 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
620 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
174 m²/s²
0-3 km storm-relative helicity
150 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.0

Open this sounding in Storm Lab

The text

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

073 
ACUS11 KWNS 271552
SWOMCD
SPC MCD 271551
SCZ000-GAZ000-FLZ000-ALZ000-271715-

MESOSCALE DISCUSSION 0293
NWS STORM PREDICTION CENTER NORMAN OK
1051 AM CDT SUN MAR 27 2011

AREAS AFFECTED...SE AL...SRN GA...SRN SC...FL PANHANDLE

CONCERNING...SEVERE THUNDERSTORM WATCH 68...

VALID 271551Z - 271715Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 68
CONTINUES.

RISK OF SURFACE-BASED THUNDERSTORMS WILL INCREASE EARLY THIS
AFTERNOON WITH THREATS OF VERY LARGE HAIL...ISOLATED TORNADOES AND
DAMAGING WIND GUSTS.

MORNING BAND OF ELEVATED STORMS ALONG/N OF THE WAVY FRONT FROM SC
MIDLANDS WWD INTO CNTRL AL HAS CONTAINED BRIEF SUPERCELL STRUCTURES
WITH LARGE HAIL.  LATE MORNING MESOANALYSIS SHOWS THAT THE BOUNDARY
LAYER WAS HEATING STEADILY AHEAD OF THESE STORMS AND THE MORNING
ACTIVITY WILL BE JOINED BY WARM-SECTOR BANDS/CLUSTERS OF STORMS
THROUGH THE AFTERNOON.  THESE STORMS WILL BE ROOTED IN THE DEEPENING
MOIST BOUNDARY LAYER EXHIBITING MLCAPES TO 1500 J/KG WITH A GOOD
PART OF THAT CAPE PROFILE BELOW MINUS 10 DEG C.  COUPLED WITH 40-50
KTS OF EFFECTIVE VERTICAL SHEAR...RISKS FOR SUPERCELLS WITH VERY
LARGE HAIL WILL RESULT.

THE LOW-LEVEL WIND PROFILE IS GENERALLY VEERED AND UNIDIRECTIONAL IN
THE WARM SECTOR WITH THE STRONGEST EFFECTIVE SRH LOCATED ACROSS
PARTS OF SE GA AND SRN SC.  WHILE THE PRIMARY SVR THREAT WILL BE THE
LARGE HAIL...ISOLATED TORNADOES WILL REMAIN POSSIBLE...PARTICULARLY
ACROSS THE ABOVE MENTIONED AREAS.

..RACY.. 03/27/2011

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

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

LAT...LON   31538681 32678434 32458257 32508102 32518042 31858048
            31298128 30858226 30518369 30028481 30138553 30438670
            30938710 31538681

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 26, 7:47 PM CDTTornado WatchSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 17 more7 hr
Mar 26, 11:21 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 17 more54 min
Mar 27, 7:33 AM CDTMesoscale DiscussionSPCAutauga, Bibb, Chambers, Chilton, Clay, Coosa and 16 more117 min
Mar 27, 8:55 AM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bullock, Butler, Chambers, Chilton and 17 more7 hr
Mar 27, 2:49 PM CDTMesoscale DiscussionSPCBaldwin, Coffee, Covington, Dale, Geneva, Henry and 1 more56 min
Mar 27, 3:27 PM CDTSevere Thunderstorm WatchSPCCoffee, Covington, Dale, Escambia, Geneva, Henry and 1 more5 hr
Mar 27, 6:24 PM CDTMesoscale DiscussionSPCBaldwin, Coffee, Conecuh, Covington, Dale, Escambia and 4 more2 hr
Mar 26, 7:55 PM CDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 36 more95 min
Mar 26, 8:19 PM CDTSevere Thunderstorm WatchSPCBanks, Barrow, Bartow, Burke, Catoosa, Chattooga and 39 more8 hr
Mar 26, 10:10 PM CDTMesoscale DiscussionSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 3 more65 min
Mar 26, 11:43 PM CDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Burke, Catoosa, Chattooga and 38 more62 min
Mar 27, 2:03 AM CDTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Ben Hill, Bibb, Bleckley and 40 more57 min
Mar 27, 2:25 AM CDTTornado WatchSPCAppling, Baldwin, Bibb, Bleckley, Bryan, Bulloch and 46 more3 hr

Nearby

Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Florida, 2011Mesoscale Discussions in Alabama, 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.