Alert archive / Georgia / Mesoscale Discussions in 2020

Mesoscale Discussion 46

January 11, 20207 states

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2020, 6:36 PM EST for 7 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Jan 11, 2020, 6:36 PM EST (23:36 UTC)
Expired
Jan 11, 2020, 8:00 PM EST
In force
84 min
Issued by
the Storm Prediction Center
All 122 counties

Baldwin County, GA, Banks County, GA, Barrow County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Chattahoochee County, GA, Clarke County, GA, Columbia County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Elbert County, GA, Franklin County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Hancock County, GA, Hart County, GA, Henry County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Lee County, GA, Lincoln County, GA, Macon County, GA, Madison County, GA, Marion County, GA, McDuffie 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, Pulaski County, GA, Putnam County, GA, Rabun County, GA, Richmond County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stephens County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Terrell County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, White County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA, Letcher County, KY, Pike County, KY, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Cleveland County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Transylvania County, NC, Watauga County, NC, Yancey County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Edgefield County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, McCormick County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Carter County, TN, Cocke County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Johnson County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, McDowell County, WV

The radar

The Greer radar (KGSP), 80 km from the middle of the area, began a volume at 23:39 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, 11.6 hours before the alert went out and 202 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, 10:28 AM ESTMesoscale DiscussionSPCCatoosa, Dade, Walker92 min
Jan 11, 1:20 PM ESTMesoscale DiscussionSPCBartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 17 more85 min
Jan 11, 1:42 PM ESTTornado WatchSPCBanks, Barrow, Bartow, Bibb, Butts, Carroll and 61 more7 hr
Jan 11, 3:26 PM ESTMesoscale DiscussionSPCBaker, Calhoun, Clay, Decatur, Early, Miller and 4 more94 min
Jan 11, 3:44 PM ESTTornado WatchSPCBaker, Calhoun, Clay, Decatur, Dougherty, Early and 9 more5 hr
Jan 11, 4:16 PM ESTMesoscale DiscussionSPCBartow, Carroll, Chattahoochee, Cherokee, Clayton, Cobb and 36 more89 min
Jan 11, 4:48 PM ESTMesoscale DiscussionSPCBanks, Elbert, Franklin, Habersham, Hart, Madison and 2 more117 min
Jan 11, 5:38 PM ESTTornado WatchSPCBaldwin, Bleckley, Burke, Clarke, Columbia, Dodge and 34 more6 hr
Jan 11, 6:21 PM ESTMesoscale DiscussionSPCBaker, Brooks, Calhoun, Colquitt, Cook, Decatur and 13 more114 min
Jan 11, 7:12 AM ESTMesoscale DiscussionSPCButler, Caldwell, Christian, Daviess, Hancock, Henderson and 9 more93 min
Jan 11, 7:57 AM ESTTornado WatchSPCAllen, Butler, Caldwell, Christian, Daviess, Hancock and 10 more7 hr
Jan 11, 9:20 AM ESTMesoscale DiscussionSPCAdair, Anderson, Barren, Boone, Boyle, Breckinridge and 45 more55 min
Jan 11, 9:36 AM ESTSevere Thunderstorm WatchSPCAdair, Anderson, Barren, Bath, Boone, Bourbon and 62 more7 hr
Jan 11, 12:35 PM ESTMesoscale DiscussionSPCAdair, Anderson, Bath, Bourbon, Boyle, Bracken and 48 more85 min
Jan 11, 12:58 AM ESTTornado WatchSPCCrockett, Dyer, Fayette, Gibson, Haywood, Lake and 4 more7 hr
Jan 11, 4:52 AM ESTMesoscale DiscussionSPCCrockett, Dyer, Fayette, Hardeman, Haywood, Lauderdale and 3 more83 min
Jan 11, 5:17 AM ESTTornado WatchSPCBenton, Carroll, Chester, Decatur, Hardeman, Hardin and 5 more6 hr
Jan 11, 6:06 AM ESTMesoscale DiscussionSPCFayette, Hardeman, McNairy54 min

Nearby

Mesoscale Discussions in Georgia, 2020Mesoscale Discussions in North Carolina, 2020Mesoscale Discussions in South Carolina, 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.