Alert archive / Georgia / Mesoscale Discussions in 2020

Mesoscale Discussion 43

January 11, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2020, 3:16 PM CST for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Jan 11, 2020, 3:16 PM CST (21:16 UTC)
Expired
Jan 11, 2020, 4:45 PM CST
In force
89 min
Issued by
the Storm Prediction Center
All 71 counties

Bullock County, AL, Chambers County, AL, Clay County, AL, Cleburne County, AL, Lee County, AL, Macon County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Bartow County, GA, Carroll County, GA, Chattahoochee County, GA, Cherokee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Lumpkin County, GA, Marion County, GA, Meriwether County, GA, Murray County, GA, Muscogee County, GA, Paulding County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Rockdale County, GA, Spalding County, GA, Stewart County, GA, Talbot County, GA, Towns County, GA, Troup County, GA, Union County, GA, Webster County, GA, White County, GA, Whitfield County, GA, Cherokee County, NC, Clay County, NC, Graham County, NC, Macon County, NC, Swain County, NC, Anderson County, TN, Blount County, TN, Bradley County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sevier County, TN, Union County, TN

The radar

The Atlanta radar (KFFC), 98 km from the middle of the area, began a volume at 21:17 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 12:00Z, 9.3 hours before the alert went out and 97 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 2020-01-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 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 2020-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 417 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
13 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
557 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
417 m²/s²
0-3 km storm-relative helicity
450 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 11, 6:12 AM CSTMesoscale DiscussionSPCColbert, Lauderdale, Limestone, Madison93 min
Jan 11, 6:57 AM CSTTornado WatchSPCColbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 7 more7 hr
Jan 11, 7:39 AM CSTMesoscale DiscussionSPCChoctaw, Clarke, Greene, Hale, Marengo, Mobile and 3 more96 min
Jan 11, 7:57 AM CSTTornado WatchSPCAutauga, Baldwin, Bibb, Blount, Butler, Chilton and 22 more9 hr
Jan 11, 9:28 AM CSTMesoscale DiscussionSPCBlount, Cullman, DeKalb, Fayette, Jackson, Lawrence and 7 more92 min
Jan 11, 9:54 AM CSTMesoscale DiscussionSPCChoctaw, Greene, Marengo, Pickens, Sumter, Washington96 min
Jan 11, 11:50 AM CSTMesoscale DiscussionSPCBibb, Blount, Chilton, Choctaw, Clarke, Cullman and 15 more85 min
Jan 11, 12:20 PM CSTMesoscale DiscussionSPCBlount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 9 more85 min
Jan 11, 12:42 PM CSTTornado WatchSPCBarbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 15 more7 hr
Jan 11, 1:15 PM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Chilton, DeKalb, Etowah and 6 more90 min
Jan 11, 2:26 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Butler, Coffee, Covington, Crenshaw and 10 more94 min
Jan 11, 2:44 PM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston5 hr
Jan 11, 5:21 PM CSTMesoscale DiscussionSPCHouston114 min
Jan 11, 3:48 PM CSTMesoscale DiscussionSPCBanks, Elbert, Franklin, Habersham, Hart, Madison and 2 more117 min
Jan 11, 4:38 PM CSTTornado WatchSPCBaldwin, Bleckley, Burke, Clarke, Columbia, Dodge and 34 more6 hr
Jan 11, 5:36 PM CSTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Butts and 63 more84 min
Jan 10, 11:58 PM CSTTornado WatchSPCCrockett, Dyer, Fayette, Gibson, Haywood, Lake and 4 more7 hr
Jan 11, 3:52 AM CSTMesoscale DiscussionSPCCrockett, Dyer, Fayette, Hardeman, Haywood, Lauderdale and 3 more83 min
Jan 11, 4:17 AM CSTTornado WatchSPCBenton, Carroll, Chester, Decatur, Hardeman, Hardin and 5 more6 hr
Jan 11, 5:06 AM CSTMesoscale DiscussionSPCFayette, Hardeman, McNairy54 min
Jan 11, 8:20 AM CSTMesoscale DiscussionSPCBledsoe, Cannon, Clay, Cumberland, DeKalb, Fentress and 11 more55 min

Nearby

Mesoscale Discussions in Georgia, 2020Mesoscale Discussions in Tennessee, 2020Mesoscale Discussions in Alabama, 2020Every mesoscale discussion in 2020

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.