Alert archive / Georgia / Mesoscale Discussions in 2012

Mesoscale Discussion 61

January 23, 20126 counties in Alabama; 20 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 23, 2012, 11:30 AM CST for 6 counties in Alabama; 20 counties in Georgia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jan 23, 2012, 11:30 AM CST (17:30 UTC)
Expired
Jan 23, 2012, 1:30 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 26 counties

Barbour County, AL, Bullock County, AL, Coffee County, AL, Crenshaw County, AL, Pike County, AL, Russell County, AL, Bibb County, GA, Bleckley County, GA, Chattahoochee County, GA, Crawford County, GA, Dooly County, GA, Harris County, GA, Houston County, GA, Macon County, GA, Marion County, GA, Muscogee County, GA, Peach County, GA, Quitman County, GA, Schley County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Twiggs County, GA, Upson County, GA, Webster County, GA

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 5.5 hours before the alert went out and 130 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 12:00Z on 2012-01-23Temperature 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 12:00Z on 2012-01-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 492 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
463 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
492 m²/s²
0-3 km storm-relative helicity
722 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.

376 
ACUS11 KWNS 231730
SWOMCD
SPC MCD 231730 
GAZ000-ALZ000-231930-

MESOSCALE DISCUSSION 0061
NWS STORM PREDICTION CENTER NORMAN OK
1130 AM CST MON JAN 23 2012

AREAS AFFECTED...SRN AL...FL PANHANDLE...SWRN GA

CONCERNING...TORNADO WATCH 12...

VALID 231730Z - 231930Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 12 CONTINUES.

TORNADO WATCH 12 WILL BE ALLOWED TO EXPIRE ON TIME.

A LINE OF STORMS HAS WEAKENED AS IT MOVED FROM ERN AL INTO
GA...WHERE COOLER AND MORE STABLE AIR EXISTS. THE LINES CONTINUES TO
TRAIL SWWD ACROSS SRN AL...BUT THESE ECHOES WERE ALSO WEAKENING DUE
TO WARM PROFILES ALOFT DESPITE RELATIVELY WARM/MOIST AIR AT THE
SURFACE.

A WARM FRONT WAS SITUATED OVER SWRN GA AT 17Z...WITH TEMPERATURES
RAPIDLY WARMING INTO THE 70S OVER SW GA. SOME PRESSURE FALLS WERE
ALSO NOTED IN THIS AREA. HOWEVER...DEWPOINTS WERE MIXING INTO THE
UPPER 50S F TO LOWER 60S F. SHEAR STILL REMAINS FAVORABLE.
THEREFORE...FOR THE NEXT COUPLE HOURS...THE GREATEST POTENTIAL WILL
BE NEAR THE INTERSECTION OF THE EXISTING LINE OF STORMS/OUTFLOW AND
THE WARM FRONT...NEAR THE AL/GA BORDER...WHERE LIFT WILL BE
STRONGEST. HOWEVER...EVEN HERE...THE THREAT IS NOT VERY GREAT FOR
SEVERE.

..JEWELL.. 01/23/2012

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

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

LAT...LON   33098428 32888357 32498328 32188357 32048404 31468553
            31278647 31368659 31958639 32398566 32728499 33098428

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 22, 9:47 PM CSTMesoscale DiscussionSPCColbert, Franklin, Lamar, Lauderdale, Marion58 min
Jan 22, 10:59 PM CSTTornado WatchSPCBlount, Colbert, Cullman, DeKalb, Fayette, Franklin and 17 more7 hr
Jan 23, 1:25 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 31 more2 hr
Jan 23, 2:44 AM CSTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 37 more9 hr
Jan 23, 4:02 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Butler, Calhoun, Chambers and 32 more118 min
Jan 23, 6:38 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Calhoun and 27 more97 min
Jan 23, 7:49 AM CSTTornado WatchSPCBibb, Carroll, Chattahoochee, Coweta, Crawford, Crisp and 24 more5 hr

Nearby

Mesoscale Discussions in Georgia, 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.