Alert archive / Georgia / Mesoscale Discussions in 2023

Mesoscale Discussion 52

January 12, 202313 counties in Alabama; 23 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2023, 10:52 AM CST for 13 counties in Alabama; 23 counties in Georgia. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Jan 12, 2023, 10:52 AM CST (16:52 UTC)
Expired
Jan 12, 2023, 11:45 AM CST
In force
53 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...tornado watch likely
Chance of a watch
80%
All 36 counties

Bullock County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Elmore County, AL, Lee County, AL, Macon County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Bartow County, GA, Carroll County, GA, Cherokee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gordon County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Meriwether County, GA, Muscogee County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Troup County, GA

The radar

The Atlanta radar (KFFC), 54 km from the middle of the area, began a volume at 16:52 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 4.9 hours before the alert went out and 60 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 2023-01-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 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, Peachtre/Fal Fld, GA at 12:00Z on 2023-01-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 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
27 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
709 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 12, 6:38 AM CSTMesoscale DiscussionSPCBibb, Colbert, Cullman, Fayette, Franklin, Greene and 12 more2 hr
Jan 12, 6:59 AM CSTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Chilton, Colbert and 27 more7 hr
Jan 12, 9:01 AM CSTMesoscale DiscussionSPCGreene, Hale, Sumter, Tuscaloosa119 min
Jan 12, 9:54 AM CSTMesoscale DiscussionSPCBibb, Greene, Hale, Marengo, Perry, Sumter96 min
Jan 12, 10:20 AM CSTTornado WatchSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 12 more7 hr
Jan 12, 11:36 AM CSTMesoscale DiscussionSPCAutauga, Chilton, Coosa, Dallas, Perry84 min
Jan 12, 12:06 PM CSTTornado WatchSPCBarbour, Bullock, Chambers, Clay, Cleburne, Lee and 5 more8 hr
Jan 12, 1:00 PM CSTMesoscale DiscussionSPCElmore, Tallapoosa60 min
Jan 12, 1:19 PM CSTMesoscale DiscussionSPCBarbour, Coffee, Dale, Geneva, Henry, Houston116 min
Jan 12, 1:55 PM CSTMesoscale DiscussionSPCColbert, Lauderdale, Lawrence, Limestone, Madison, Morgan65 min
Jan 12, 2:01 PM CSTMesoscale DiscussionSPCChambers119 min
Jan 12, 2:06 PM CSTMesoscale DiscussionSPCBaldwin, Butler, Coffee, Conecuh, Covington, Crenshaw and 4 more114 min
Jan 12, 2:36 PM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston6 hr
Jan 12, 3:43 PM CSTMesoscale DiscussionSPCBarbour, Dale, Henry92 min
Jan 12, 9:13 AM CSTMesoscale DiscussionSPCBartow, Catoosa, Chattooga, Dade, Floyd, Gordon and 4 more62 min
Jan 12, 10:03 AM CSTTornado WatchSPCBartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 11 more6 hr
Jan 12, 3:16 PM CSTMesoscale DiscussionSPCColumbia, Elbert, Franklin, Hart, Lincoln, Stephens59 min
Jan 12, 3:41 PM CSTTornado WatchSPCBurke, Columbia, Elbert, Franklin, Hart, Lincoln and 3 more3 hr
Jan 12, 5:12 PM CSTMesoscale DiscussionSPCBleckley, Calhoun, Colquitt, Crisp, Dodge, Dooly and 15 more93 min

Nearby

Mesoscale Discussions in Georgia, 2023Mesoscale Discussions in Alabama, 2023Every mesoscale discussion in 2023

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.