Alert archive / Georgia / Mesoscale Discussions in 2012

Mesoscale Discussion 196

March 1, 201215 counties in Alabama; 57 counties in Georgia; 8 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2012, 3:00 AM CST for 15 counties in Alabama; 57 counties in Georgia; 8 counties in South Carolina. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Mar 1, 2012, 3:00 AM CST (09:00 UTC)
Expired: Mar 1, 2012, 4:30 AM CST
In force: 90 min
Issued by: the Storm Prediction Center

All 80 counties

Autauga County, AL, Bibb County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Elmore County, AL, Lee County, AL, Macon County, AL, Perry County, AL, Randolph County, AL, Shelby County, AL, Talladega County, AL, Tallapoosa County, AL, Baldwin County, GA, Barrow County, GA, Bibb County, GA, Burke County, GA, Butts County, GA, Carroll County, GA, Clarke County, GA, Clayton County, GA, Columbia County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Douglas County, GA, Elbert County, GA, Fayette County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Jasper County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Putnam County, GA, Richmond County, GA, Rockdale County, GA, Spalding 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, Wilkes County, GA, Wilkinson County, GA, Aiken County, SC, Allendale County, SC, Barnwell County, SC, Edgefield County, SC, Greenwood County, SC, Lexington County, SC, McCormick County, SC, Saluda County, SC

The radar

The Atlanta radar (KFFC), 24 km from the middle of the area, began a volume at 09:02 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 9.0 hours before the alert went out and 27 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 355 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 874 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

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

980 
ACUS11 KWNS 010901
SWOMCD
SPC MCD 010900
SCZ000-GAZ000-ALZ000-011030-

MESOSCALE DISCUSSION 0196
NWS STORM PREDICTION CENTER NORMAN OK
0300 AM CST THU MAR 01 2012

AREAS AFFECTED...CENTRAL AL/GA AND WRN SC

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 010900Z - 011030Z

A WW IS BEING CONSIDERED FOR PARTS OF CENTRAL AL...CENTRAL GA INTO
WRN SC.

REGIONAL RADAR IMAGERY/LIGHTNING DATA SINCE 06Z INDICATED AN
INCREASE IN TSTM COVERAGE IN A NARROW ZONE OVER CENTRAL AL/GA.  RUC
FORECAST SOUNDINGS SUGGEST MOST OR AT LEAST THE SRN EXTENT OF THIS
ACTIVITY IS LIKELY NEAR SURFACE /OR SURFACE/ BASED.

OBJECTIVE AND FORECAST DATA SHOWED W-E LOW-MID LEVEL CONFLUENCE
REGIONS OVER CENTRAL AND SRN MS TO GA...WITH THE PERSISTENT TSTM
ACTIVITY OCCURRING ALONG AN 850 MB BOUNDARY FROM CENTRAL AL INTO
CENTRAL GA.  A 30-40 KT WLY LLJ RESIDES ALONG THIS CORRIDOR COMBINED
WITH RICH MOISTURE /PW VALUES 1-1.4 INCH/ AND 7 C/KM MIDLEVEL LAPSE
RATES.  WEAK HEIGHT FALLS EXPECTED ACROSS THIS REGION THROUGH
DAYBREAK AND CONVERGENCE ALONG THE 850 MB BOUNDARY AND THE APPROACH
OF A SWD MOVING COLD FRONT TOWARD THE ONGOING TSTMS IS EXPECTED TO
PROVE SUFFICIENT FOR TSTMS TO PERSIST.

THE COMBINATION OF MUCAPE 500-1000 J/KG PER OBJECTIVE ANALYSES...
RELATIVELY STEEP MIDLEVEL LAPSE RATES...AND STRONG DEEP LAYER SHEAR
/50-60 KT/ SUGGEST ADDITIONAL ORGANIZED STORMS CAN BE EXPECTED
ACROSS CENTRAL AL AND CENTRAL GA.  STORM MOTION TO THE E AT 40 KT
AND STRONG WIND FIELDS ALOFT SUPPORT A DAMAGING WIND THREAT...WHILE
STRONG LOW LEVEL DIRECTIONAL/SPEED SHEAR /EFFECTIVE SRH 200-400 M2
PER S2/ SUPPORT A TORNADO THREAT AS WELL.

..PETERS.. 03/01/2012

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

ATTN...WFO...CHS...CAE...GSP...FFC...BMX...

LAT...LON   33098761 33528669 33868500 34218273 34148145 33458084
            32818146 32498304 32408541 32308669 32518724 33098761

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 1, 10:24 AM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Clarke, Coffee, Conecuh and 11 more	96 min
Mar 1, 12:44 PM CST	Mesoscale Discussion	SPC	Bryan, Bulloch, Candler, Chatham, Dodge, Effingham and 8 more	91 min

Nearby

Mesoscale Discussions in Georgia, 2012 Mesoscale Discussions in Alabama, 2012 Mesoscale Discussions in South Carolina, 2012 Every 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; radar from the NEXRAD Level II archive.