Alert archive / Mississippi / Tornado Watches in 2020

Tornado Watch 10

January 11, 202014 counties in Mississippi; 11 counties in Tennessee

The Storm Prediction Center issued this tornado watch at Jan 11, 2020, 4:17 AM CST for 14 counties in Mississippi; 11 counties in Tennessee. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jan 11, 2020, 4:17 AM CST (10:17 UTC)
Expired
Jan 11, 2020, 10:00 AM CST
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
70 kt
All 25 counties

Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Monroe County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Yalobusha County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Decatur County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, Henry County, TN, Madison County, TN, McNairy County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 120 km from the middle of the area, began a volume at 10:21 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
60%
One or more gusts of 65 knots or more
30%
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

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

IssuedProductOfficeCountiesLasted
Jan 11, 4:22 AM CSTSevere Thunderstorm WarningMEGCoahoma, Panola, Quitman, Tallahatchie, Yalobusha38 min
Jan 11, 4:55 AM CSTSevere Thunderstorm WarningMEGCalhoun, Lafayette, Marshall, Panola, Tallahatchie, Tate and 2 more50 min
Jan 11, 5:13 AM CSTTornado WarningMEGBenton, Lafayette, Marshall, Panola, Tate27 min
Jan 11, 5:19 AM CSTSevere Thunderstorm WarningMEGCalhoun, Lafayette, Marshall, Panola, Pontotoc, Union and 1 more41 min
Jan 11, 5:21 AM CSTSevere Thunderstorm WarningMEGBenton, Marshall39 min
Jan 11, 5:34 AM CSTSevere Thunderstorm WarningMEGLafayette, Panola, Quitman, Tate5 min
Jan 11, 5:36 AM CSTTornado WarningMEGFayette, Hardeman24 min
Jan 11, 5:37 AM CSTSevere Thunderstorm WarningMEGBenton, Marshall, Tippah, Union38 min
Jan 11, 5:57 AM CSTSevere Thunderstorm WarningMEGBenton, Calhoun, Chickasaw, Lafayette, Lee, Marshall and 4 more48 min
Jan 11, 6:09 AM CSTSevere Thunderstorm WarningMEGAlcorn, Benton, Prentiss, Tippah51 min
Jan 11, 6:19 AM CSTSevere Thunderstorm WarningMEGChester, Hardeman, Hardin, McNairy41 min
Jan 11, 6:37 AM CSTSevere Thunderstorm WarningMEGChickasaw, Itawamba, Lee, Monroe, Pontotoc, Prentiss and 2 more38 min
Jan 11, 6:38 AM CSTSevere Thunderstorm WarningMEGBenton, Carroll, Henry37 min
Jan 11, 6:41 AM CSTSevere Thunderstorm WarningMEGBenton, Chester, Decatur, Hardin, Henderson, McNairy47 min
Jan 11, 6:56 AM CSTTornado WarningMEGLee, Prentiss, Tishomingo22 min
Jan 11, 6:59 AM CSTSevere Thunderstorm WarningMEGAlcorn, Prentiss, Tishomingo46 min
Jan 11, 7:05 AM CSTTornado WarningMEGAlcorn, Prentiss, Tishomingo40 min
Jan 11, 7:08 AM CSTSevere Thunderstorm WarningMEGChickasaw, Itawamba, Lee, Monroe, Prentiss, Tishomingo52 min
Jan 11, 7:37 AM CSTSevere Thunderstorm WarningMEGHardin23 min
Jan 11, 7:40 AM CSTSevere Thunderstorm WarningMEGItawamba, Lee, Monroe50 min
Jan 11, 9:17 AM CSTFlash Flood WarningMEGCalhoun, Chickasaw, Itawamba, Lee, Monroe, Pontotoc and 1 more4 hr

Discussions around it

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

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 10.3 hours before the alert went out and 142 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, Little Rock, AR at 00:00Z on 2020-01-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 346 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, Little Rock, AR at 00:00Z on 2020-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 341 square meters per square second.1939587897117Sfc1 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
346 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
532 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
341 m²/s²
0-3 km storm-relative helicity
385 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.2

Open this sounding in Storm Lab

The text

As transmitted.

085 
WWUS20 KWNS 111013
SEL0  
SPC WW 111013
MSZ000-TNZ000-111600-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 10
NWS Storm Prediction Center Norman OK
415 AM CST Sat Jan 11 2020

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northeast Mississippi
  Western Tennessee

* Effective this Saturday morning from 415 AM until 1000 AM CST.

* Primary threats include...
  A couple tornadoes possible
  Scattered damaging winds likely with isolated significant gusts
    to 80 mph possible

SUMMARY...Squall line along the Mississippi River will move east
across northern Mississippi and western Tennessee this morning.
Damaging winds are the primary threat, but a couple tornadoes are
also possible.

The tornado watch area is approximately along and 35 statute miles
east and west of a line from 65 miles north northeast of Jackson TN
to 35 miles south southwest of Tupelo MS. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU0).

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 7...WW 8...WW 9...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0.5 inches. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 24045.

...Grams

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 10, 11:58 PM CSTTornado WatchSPCBolivar, Coahoma, DeSoto, Leflore, Marshall, Panola and 6 more7 hr
Jan 11, 2:22 AM CSTMesoscale DiscussionSPCAdams, Claiborne, Copiah, Franklin, Hinds, Humphreys and 8 more53 min
Jan 11, 2:37 AM CSTTornado WatchSPCAdams, Attala, Carroll, Choctaw, Claiborne, Copiah and 22 more8 hr
Jan 11, 3:52 AM CSTMesoscale DiscussionSPCBenton, Bolivar, Coahoma, DeSoto, Grenada, Lafayette and 9 more83 min
Jan 11, 4:31 AM CSTMesoscale DiscussionSPCAdams, Amite, Claiborne, Copiah, Franklin, Hinds and 11 more59 min
Jan 11, 5:06 AM CSTMesoscale DiscussionSPCAlcorn, Benton, DeSoto, Lafayette, Lee, Marshall and 7 more54 min
Jan 11, 5:18 AM CSTTornado WatchSPCAmite, Hancock, Pearl River, Pike, Walthall, Wilkinson7 hr
Jan 11, 7:39 AM CSTMesoscale DiscussionSPCAmite, Attala, Choctaw, Clarke, Copiah, Covington and 31 more96 min
Jan 11, 7:57 AM CSTTornado WatchSPCClarke, Clay, Covington, Forrest, George, Greene and 20 more9 hr
Jan 11, 9:54 AM CSTMesoscale DiscussionSPCClarke, Forrest, Greene, Jasper, Jones, Kemper and 10 more96 min
Jan 11, 6:12 AM CSTMesoscale DiscussionSPCBenton, Cheatham, Davidson, Dickson, Giles, Hickman and 14 more93 min
Jan 11, 6:57 AM CSTTornado WatchSPCBedford, Cannon, Cheatham, Clay, Coffee, Cumberland and 34 more7 hr
Jan 11, 8:20 AM CSTMesoscale DiscussionSPCBledsoe, Cannon, Clay, Cumberland, DeKalb, Fentress and 11 more55 min
Jan 11, 9:28 AM CSTMesoscale DiscussionSPCBedford, Bledsoe, Cannon, Clay, Coffee, Cumberland and 27 more92 min
Jan 11, 12:20 PM CSTMesoscale DiscussionSPCBledsoe, Bradley, Franklin, Grundy, Hamilton, McMinn and 6 more85 min
Jan 11, 12:42 PM CSTTornado WatchSPCAnderson, Bledsoe, Blount, Bradley, Coffee, Cumberland and 18 more7 hr
Jan 11, 3:16 PM CSTMesoscale DiscussionSPCAnderson, Blount, Bradley, Jefferson, Knox, Loudon and 9 more89 min
Jan 11, 5:36 PM CSTMesoscale DiscussionSPCCarter, Cocke, Greene, Hamblen, Hancock, Hawkins and 4 more84 min

Nearby

Tornado Watches in Mississippi, 2020Tornado Watches in Tennessee, 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.