Alert archive / Kentucky / Tornado Watches in 2022

Tornado Watch 2

December 31, 20214 states

The Storm Prediction Center issued this tornado watch at Dec 31, 2021, 11:57 PM CST for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Dec 31, 2021, 11:57 PM CST (05:57 UTC)
Expired
Jan 1, 2022, 7:00 AM CST
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 84 counties

Clay County, AR, Craighead County, AR, Cross County, AR, Greene County, AR, Mississippi County, AR, Poinsett County, AR, Adair County, KY, Allen County, KY, Barren County, KY, Butler County, KY, Calloway County, KY, Carlisle County, KY, Casey County, KY, Christian County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Fulton County, KY, Graves County, KY, Green County, KY, Hart County, KY, Hickman County, KY, Jackson County, KY, Knox County, KY, Laurel County, KY, Lincoln County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCreary County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Owsley County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Simpson County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Wayne County, KY, Whitley County, KY, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Clay County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fentress County, TN, Gibson County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lake County, TN, Lauderdale County, TN, Macon County, TN, Madison County, TN, Montgomery County, TN, Obion County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Robertson County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Tipton County, TN, Trousdale County, TN, Weakley County, TN, Wilson County, TN

The radar

The Ft Campbell radar (KHPX), 79 km from the middle of the area, began a volume at 05:57 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
30%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jan 1, 12:17 AM CSTSevere Thunderstorm WarningMEGMississippi28 min
Jan 1, 12:42 AM CSTSevere Thunderstorm WarningMEGPemiscot33 min
Jan 1, 1:16 AM CSTSevere Thunderstorm Warning Considerable damage threatMEGHenry, Obion, Weakley44 min
Jan 1, 1:38 AM CSTFlash Flood WarningPAHCalloway, Graves, Marshall, Trigg6 hr
Jan 1, 1:41 AM CSTTornado WarningMEGHenry, Weakley34 min
Jan 1, 1:51 AM CSTSevere Thunderstorm WarningPAHCalloway, Graves, Marshall39 min
Jan 1, 1:57 AM CSTTornado WarningMEGHenry, Weakley35 min
Jan 1, 2:01 AM CSTFlash Flood WarningPAHChristian, Todd6 hr
Jan 1, 2:04 AM CSTSevere Thunderstorm WarningMEGClay26 min
Jan 1, 2:20 AM CSTSevere Thunderstorm WarningOHXStewart40 min
Jan 1, 2:21 AM CSTSevere Thunderstorm WarningLMKBarren, Green, Metcalfe24 min
Jan 1, 3:13 AM CSTFlash Flood WarningLMKAllen, Barren, Metcalfe, Warren5 hr
Jan 1, 3:15 AM CSTSevere Thunderstorm WarningPAHChristian, Todd30 min
Jan 1, 3:39 AM CSTFlash Flood WarningLMKAdair, Casey, Green, Metcalfe, Taylor5 hr
Jan 1, 4:01 AM CSTFlash Flood WarningJKLClay, Laurel, Leslie, Owsley, Perry7 hr
Jan 1, 4:20 AM CSTSevere Thunderstorm WarningLMKAllen, Barren, Edmonson, Warren25 min
Jan 1, 4:39 AM CSTSevere Thunderstorm WarningLMKBarren, Green, Metcalfe36 min
Jan 1, 4:47 AM CSTFlash Flood WarningLMKLincoln3 hr
Jan 1, 4:54 AM CSTSevere Thunderstorm WarningJKLJackson, Pulaski, Rockcastle36 min
Jan 1, 5:08 AM CSTFlash Flood WarningJKLBreathitt, Clay, Jackson, Lee, Owsley, Perry5 hr
Jan 1, 5:13 AM CSTSevere Thunderstorm WarningLMKAdair, Metcalfe, Russell32 min
Jan 1, 5:18 AM CSTFlash Flood WarningJKLJackson, Rockcastle5 hr
Jan 1, 5:39 AM CSTSevere Thunderstorm WarningLMKAdair, Casey, Russell21 min
Jan 1, 5:47 AM CSTSevere Thunderstorm WarningJKLPulaski, Rockcastle43 min
Jan 1, 5:57 AM CSTTornado WarningJKLPulaski33 min
Jan 1, 6:22 AM CSTSevere Thunderstorm Warning Considerable damage threatJKLLaurel, Pulaski, Rockcastle39 min
Jan 1, 6:25 AM CSTTornado WarningJKLLaurel, Pulaski, Rockcastle20 min
Jan 1, 6:45 AM CSTFlash Flood WarningJKLJackson, Laurel, Pulaski, Rockcastle5 hr
Jan 1, 6:51 AM CSTSevere Thunderstorm WarningJKLClay, Jackson, Laurel, Owsley, Rockcastle39 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

Nashville Metro, TN (KBNA), launched 00:00Z, 6.0 hours before the alert went out and 135 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, Nashville Metro, TN at 00:00Z on 2022-01-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 336 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, Nashville Metro, TN at 00:00Z on 2022-01-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 square meters per square second.1939587897117136Sfc1 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
336 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
894 m above ground
0-6 km bulk shear
79 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
268 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.3

Open this sounding in Storm Lab

The text

As transmitted.

724 
WWUS20 KWNS 010555
SEL2  
SPC WW 010555
ARZ000-KYZ000-MOZ000-TNZ000-011300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 2
NWS Storm Prediction Center Norman OK
1155 PM CST Fri Dec 31 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northeast Arkansas
  Southern Kentucky
  Southeast Missouri
  Western and northern Tennessee

* Effective this Friday night and Saturday morning from 1155 PM
  until 700 AM CST.

* Primary threats include...
  A couple tornadoes possible
  Scattered damaging wind gusts to 70 mph possible
  Isolated large hail events to 1 inch in diameter possible

SUMMARY...Strong to severe thunderstorms are expected to develop and
persist across the region overnight. A moist and modestly unstable
air mass along with very strong deep-layer/low-level winds will
support the possibility of well-organized/rotating storms capable of
tornado and damaging wind risks.

The tornado watch area is approximately along and 40 statute miles
north and south of a line from 15 miles west southwest of Jonesboro
AR to 15 miles east of London KY. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU2).

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 1...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 24040.

...Guyer

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 31, 9:08 PM CSTMesoscale DiscussionSPCCleburne, Conway, Craighead, Cross, Faulkner, Garland and 24 more3 hr
Dec 31, 10:35 PM CSTSevere Thunderstorm WatchSPCClark, Cleburne, Conway, Faulkner, Garland, Hot Spring and 26 more353 days
Jan 1, 2:07 AM CSTMesoscale DiscussionSPCCleburne, Craighead, Cross, Greene, Independence, Jackson and 4 more113 min
Jan 1, 11:37 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 5 more113 min
Jan 1, 1:30 PM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 9 more9 hr
Dec 31, 9:31 PM CSTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 67 more2 hr
Jan 1, 10:29 AM CSTMesoscale DiscussionSPCAdair, Allen, Barren, Butler, Casey, Edmonson and 10 more61 min
Jan 1, 10:50 AM CSTTornado WatchSPCAdair, Allen, Barren, Boyle, Casey, Clinton and 14 more7 hr
Jan 1, 12:38 PM CSTMesoscale DiscussionSPCAdair, Casey, Clay, Clinton, Cumberland, Estill and 17 more97 min
Jan 1, 12:56 PM CSTTornado WatchSPCBell, Breathitt, Clay, Harlan, Jackson, Knott and 12 more6 hr
Jan 1, 10:31 AM CSTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Daviess, DeKalb, Gentry and 9 more4 hr
Jan 1, 1:57 PM CSTMesoscale DiscussionSPCBedford, Giles, Hardin, Lawrence, Lincoln, Marshall and 2 more93 min
Jan 1, 3:27 PM CSTMesoscale DiscussionSPCAnderson, Bledsoe, Campbell, Coffee, Cumberland, Franklin and 14 more93 min
Jan 1, 5:53 PM CSTMesoscale DiscussionSPCAnderson, Bledsoe, Blount, Bradley, Cumberland, Franklin and 19 more67 min

Nearby

Tornado Watches in Kentucky, 2022Tornado Watches in Tennessee, 2022Tornado Watches in Arkansas, 2022Every tornado watch in 2022

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.