Alert archive / Georgia / Tornado Watches in 2020

Tornado Watch 17

January 11, 202040 counties in Georgia; 28 counties in North Carolina; 16 counties in South Carolina

The Storm Prediction Center issued this tornado watch at Jan 11, 2020, 5:38 PM EST for 40 counties in Georgia; 28 counties in North Carolina; 16 counties in South Carolina. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jan 11, 2020, 5:38 PM EST (22:38 UTC)
Expired
Jan 12, 2020, 12:00 AM EST
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
60 kt
All 84 counties

Baldwin County, GA, Bleckley County, GA, Burke County, GA, Clarke County, GA, Columbia County, GA, Dodge County, GA, Elbert County, GA, Emanuel County, GA, Franklin County, GA, Glascock County, GA, Greene County, GA, Habersham County, GA, Hancock County, GA, Hart County, GA, Jefferson County, GA, Johnson County, GA, Laurens County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Montgomery County, GA, Morgan County, GA, Oconee County, GA, Oglethorpe County, GA, Pulaski County, GA, Putnam County, GA, Rabun County, GA, Richmond County, GA, Stephens County, GA, Taliaferro County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Twiggs County, GA, Warren County, GA, Washington County, GA, Wheeler County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA, Alexander County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Union County, NC, Yancey County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Greenville County, SC, Greenwood County, SC, Laurens County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Pickens County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 59 km from the middle of the area, began a volume at 22:40 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

42 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jan 11, 5:42 PM ESTSevere Thunderstorm WarningGSPGraham, Macon, Swain50 min
Jan 11, 5:59 PM ESTSevere Thunderstorm WarningGSPHabersham, Rabun, Stephens61 min
Jan 11, 6:10 PM ESTSevere Thunderstorm WarningGSPHaywood, Jackson, Macon, Swain41 min
Jan 11, 6:31 PM ESTSevere Thunderstorm WarningGSPBuncombe, Haywood, Jackson, Madison, Transylvania44 min
Jan 11, 6:42 PM ESTSevere Thunderstorm WarningGSPFranklin, Hart, Rabun, Stephens48 min
Jan 11, 6:52 PM ESTSevere Thunderstorm WarningFFCJasper, Morgan, Putnam38 min
Jan 11, 6:58 PM ESTSevere Thunderstorm WarningFFCBibb, Crawford, Houston, Peach, Taylor, Twiggs47 min
Jan 11, 7:02 PM ESTSevere Thunderstorm WarningGSPBuncombe, Haywood, Henderson, Transylvania43 min
Jan 11, 7:13 PM ESTSevere Thunderstorm WarningGSPGreenville, Pickens62 min
Jan 11, 7:14 PM ESTSevere Thunderstorm WarningFFCDooly, Houston, Macon, Peach, Sumter, Twiggs46 min
Jan 11, 7:32 PM ESTSevere Thunderstorm WarningGSPBuncombe, Henderson, McDowell, Polk, Rutherford, Yancey31 min
Jan 11, 7:39 PM ESTSevere Thunderstorm WarningGSPElbert, Franklin, Hart51 min
Jan 11, 7:43 PM ESTSevere Thunderstorm WarningFFCBaldwin, Bibb, Jones, Twiggs, Washington, Wilkinson47 min
Jan 11, 7:53 PM ESTSevere Thunderstorm WarningGSPBurke, McDowell, Mitchell, Polk, Rutherford, Yancey52 min
Jan 11, 7:54 PM ESTSevere Thunderstorm WarningFFCBleckley, Dodge, Houston, Laurens, Pulaski, Twiggs and 1 more51 min
Jan 11, 7:54 PM ESTTornado WarningGSPHart36 min
Jan 11, 8:01 PM ESTSevere Thunderstorm WarningFFCWilkes29 min
Jan 11, 8:02 PM ESTSevere Thunderstorm WarningGSPAvery, Burke, Caldwell43 min
Jan 11, 8:07 PM ESTTornado WarningFFCWilkes13 min
Jan 11, 8:13 PM ESTSevere Thunderstorm WarningCAELincoln32 min
Jan 11, 8:20 PM ESTSevere Thunderstorm WarningFFCBaldwin, Glascock, Hancock, Jefferson, Taliaferro, Warren and 2 more40 min
Jan 11, 8:21 PM ESTSevere Thunderstorm WarningGSPElbert39 min
Jan 11, 8:22 PM ESTSevere Thunderstorm WarningGSPAlexander, Burke, Caldwell, Catawba, Cleveland, Lincoln and 2 more53 min
Jan 11, 8:25 PM ESTSevere Thunderstorm WarningCAEColumbia, Lincoln, McDuffie35 min
Jan 11, 8:29 PM ESTSevere Thunderstorm WarningGSPAnderson, Greenville, Laurens, Pickens, Spartanburg45 min
Jan 11, 8:34 PM ESTTornado WarningGSPAbbeville, Greenwood, Laurens26 min
Jan 11, 8:51 PM ESTSevere Thunderstorm WarningCAEColumbia, Lincoln, McDuffie39 min
Jan 11, 8:53 PM ESTSevere Thunderstorm WarningCAEBurke, Columbia, McDuffie, Richmond52 min
Jan 11, 8:56 PM ESTSevere Thunderstorm WarningGSPGreenwood, Laurens, Spartanburg, Union49 min
Jan 11, 8:57 PM ESTSevere Thunderstorm WarningGSPAlexander, Catawba, Cleveland, Gaston, Iredell, Lincoln48 min
Jan 11, 8:59 PM ESTSevere Thunderstorm WarningGSPCherokee, Spartanburg, Union46 min
Jan 11, 9:12 PM ESTSevere Thunderstorm WarningCAEFairfield, Newberry, Saluda48 min
Jan 11, 9:21 PM ESTSevere Thunderstorm WarningGSPCherokee, Chester, Union, York39 min
Jan 11, 9:32 PM ESTSevere Thunderstorm WarningCAEAiken, Edgefield, Fairfield, Lexington, Newberry, Richland and 1 more43 min
Jan 11, 9:36 PM ESTFlash Flood WarningGSPMcDowell3 hr
Jan 11, 9:36 PM ESTTornado WarningGSPChester, Union, York24 min
Jan 11, 9:37 PM ESTTornado WarningCAEFairfield, Newberry23 min
Jan 11, 9:41 PM ESTSevere Thunderstorm WarningGSPCabarrus, Catawba, Davie, Gaston, Iredell, Lincoln and 2 more49 min
Jan 11, 9:46 PM ESTSevere Thunderstorm WarningCAEBurke, Richmond44 min
Jan 11, 9:55 PM ESTSevere Thunderstorm WarningGSPMecklenburg, Union65 min
Jan 11, 10:19 PM ESTSevere Thunderstorm WarningGSPCabarrus, Davie, Mecklenburg, Rowan41 min
Jan 11, 10:31 PM ESTTornado WarningGSPUnion17 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.6 hours before the alert went out and 219 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.

149 
WWUS20 KWNS 112235
SEL7  
SPC WW 112235
GAZ000-NCZ000-SCZ000-120500-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 17
NWS Storm Prediction Center Norman OK
535 PM EST Sat Jan 11 2020

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  East and Northeast Georgia
  Western North Carolina
  Western South Carolina

* Effective this Saturday afternoon from 535 PM until Midnight
  EST.

* Primary threats include...
  A couple tornadoes possible
  Scattered damaging wind gusts to 70 mph possible

SUMMARY...A well-organized/fast-moving line of storms will continue
to steadily progress east-northeastward across the region this
evening. Damaging winds and a couple of tornadoes will be possible
within a weak instability/high shear scenario.

The tornado watch area is approximately along and 50 statute miles
east and west of a line from 30 miles east northeast of Hot Springs
NC to 50 miles west southwest of Vidalia GA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU7).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 15...WW 16...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 26045.

...Guyer

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, 6:21 PM ESTMesoscale DiscussionSPCBaker, Brooks, Calhoun, Colquitt, Cook, Decatur and 13 more114 min
Jan 11, 6:36 PM ESTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Butts and 63 more84 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
Jan 11, 7:12 AM ESTMesoscale DiscussionSPCBenton, Cheatham, Davidson, Dickson, Giles, Hickman and 14 more93 min
Jan 11, 7:57 AM ESTTornado WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 34 more7 hr
Jan 11, 9:20 AM ESTMesoscale DiscussionSPCBledsoe, Cannon, Clay, Cumberland, DeKalb, Fentress and 11 more55 min

Nearby

Tornado Watches in Georgia, 2020Tornado Watches in North Carolina, 2020Tornado Watches in South Carolina, 2020Every tornado watch 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.