Alert archive / Tennessee / Tornado Watches in 2014

Tornado Watch 59

April 4, 201423 counties in Alabama; 10 counties in Mississippi; 36 counties in Tennessee

The Storm Prediction Center issued this tornado watch at Apr 4, 2014, 2:52 AM CDT for 23 counties in Alabama; 10 counties in Mississippi; 36 counties in Tennessee. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 4, 2014, 2:52 AM CDT (07:52 UTC)
Expired
Apr 4, 2014, 7:54 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 69 counties

Blount County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Clay County, MS, Kemper County, MS, Lauderdale County, MS, Lowndes County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Scott County, MS, Winston County, MS, Bedford County, TN, Cannon County, TN, Cheatham County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hickman County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Columbus AFB radar (KGWX), 65 km from the middle of the area, began a volume at 07:53 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
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 4, 3:50 AM CDTSevere Thunderstorm WarningJANClay55 min
Apr 4, 4:02 AM CDTSevere Thunderstorm WarningJANOktibbeha58 min
Apr 4, 4:10 AM CDTSevere Thunderstorm WarningOHXPerry, Wayne50 min
Apr 4, 4:13 AM CDTSevere Thunderstorm WarningHUNColbert, Franklin, Lauderdale47 min
Apr 4, 4:17 AM CDTSevere Thunderstorm WarningBMXLamar, Marion58 min
Apr 4, 4:26 AM CDTSevere Thunderstorm WarningJANLowndes49 min
Apr 4, 4:34 AM CDTSevere Thunderstorm WarningHUNFranklin, Lawrence41 min
Apr 4, 4:44 AM CDTSevere Thunderstorm WarningOHXDickson, Hickman, Houston, Humphreys61 min
Apr 4, 4:53 AM CDTSevere Thunderstorm WarningBMXFayette, Walker, Winston67 min
Apr 4, 5:19 AM CDTSevere Thunderstorm WarningOHXCheatham, Davidson, Dickson, Hickman, Williamson41 min
Apr 4, 5:33 AM CDTSevere Thunderstorm WarningOHXDavidson, Rutherford, Smith, Sumner, Williamson, Wilson57 min
Apr 4, 5:47 AM CDTSevere Thunderstorm WarningOHXBedford, Marshall, Maury, Rutherford, Williamson43 min
Apr 4, 6:05 AM CDTSevere Thunderstorm WarningHUNCullman, Marshall25 min
Apr 4, 6:11 AM CDTTornado WarningOHXCannon, DeKalb, Rutherford, Smith, Wilson34 min
Apr 4, 6:21 AM CDTSevere Thunderstorm WarningHUNDeKalb, Jackson, Marshall24 min
Apr 4, 6:33 AM CDTSevere Thunderstorm WarningOHXBedford, Cannon, Coffee, DeKalb, Rutherford, Warren and 1 more42 min
Apr 4, 6:43 AM CDTSevere Thunderstorm WarningHUNDeKalb, Jackson17 min
Apr 4, 7:35 AM CDTSevere Thunderstorm WarningOHXCumberland, Fentress55 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

Birmingham, AL (KBMX), launched 00:00Z, 7.9 hours before the alert went out and 177 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, Birmingham, AL at 00:00Z on 2014-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Birmingham, AL at 00:00Z on 2014-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2046 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
243 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

662 
WWUS20 KWNS 040754
SEL9  
SPC WW 040754
ALZ000-MSZ000-TNZ000-041500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 59
NWS STORM PREDICTION CENTER NORMAN OK
255 AM CDT FRI APR 4 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHERN AND WESTERN ALABAMA
  EASTERN MISSISSIPPI
  MIDDLE TENNESSEE

* EFFECTIVE THIS FRIDAY MORNING FROM 255 AM UNTIL 1000 AM CDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL TORNADOES POSSIBLE
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY
  SEVERAL LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH NORTHEAST OF
MUSCLE SHOALS ALABAMA TO 80 MILES SOUTHWEST OF TUSCALOOSA
ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 55...WW 56...WW 57...WW
58...

DISCUSSION...BOW ECHO CONVECTIVE SYSTEM NOW IN NW MS EXPECTED TO
CONTINUE GENERALLY ENE INTO PARTS OF AL AND MIDDLE TN LATER THIS
MORNING. WHILE LOW-LVL BUOYANCY SOMEWHAT DIMINISHES WITH EWD EXTENT
ACROSS WW...EXISTING ORGANIZATION OF CONVECTIVE SYSTEM AND
STRENGTH/CHARACTER OF OBSERVED/FCST WIND FIELDS ON SE FRINGE OF
POTENT MID MS VLY SHORTWAVE TROUGH SUGGEST A CONTINUED RISK FOR DMGG
WIND AND POSSIBLY A COUPLE TORNADOES.

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 500.
MEAN STORM MOTION VECTOR 25040.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 2:29 AM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 9 more31 min
Apr 4, 5:28 AM CDTMesoscale DiscussionSPCBibb, Blount, Cullman, DeKalb, Etowah, Fayette and 16 more92 min
Apr 4, 7:00 AM CDTMesoscale DiscussionSPCCalhoun, Cherokee, Chilton, Clay, Cleburne, Coosa and 4 more90 min
Apr 4, 10:12 AM CDTMesoscale DiscussionSPCSumter63 min
Apr 3, 10:45 PM CDTMesoscale DiscussionSPCBenton, Bolivar, Calhoun, Carroll, Coahoma, DeSoto and 16 more60 min
Apr 4, 12:20 AM CDTMesoscale DiscussionSPCBolivar, Carroll, Claiborne, Coahoma, Copiah, DeSoto and 19 more55 min
Apr 4, 12:40 AM CDTTornado WatchSPCAlcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 37 more5 hr
Apr 4, 3:45 AM CDTMesoscale DiscussionSPCAlcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 21 more60 min
Apr 4, 5:04 AM CDTMesoscale DiscussionSPCAmite, Copiah, Covington, Forrest, Franklin, Jasper and 12 more116 min
Apr 4, 5:25 AM CDTSevere Thunderstorm WatchSPCAdams, Amite, Claiborne, Clarke, Copiah, Covington and 31 more7 hr
Apr 4, 7:22 AM CDTMesoscale DiscussionSPCAmite, Clarke, Covington, Forrest, Franklin, Hancock and 14 more83 min
Apr 3, 8:16 PM CDTMesoscale DiscussionSPCCrockett, Dyer, Gibson, Henry, Lake, Lauderdale and 3 more59 min
Apr 3, 8:30 PM CDTTornado WatchSPCCrockett, Dyer, Gibson, Henry, Lake, Lauderdale and 2 more7 hr
Apr 3, 11:40 PM CDTMesoscale DiscussionSPCCrockett, Dyer, Gibson, Henry, Lake, Lauderdale and 2 more95 min
Apr 4, 1:39 AM CDTMesoscale DiscussionSPCCheatham, Davidson, Dickson, Houston, Humphreys, Macon and 6 more3 hr
Apr 4, 2:12 AM CDTMesoscale DiscussionSPCDyer, Gibson, Henry, Obion, Stewart, Weakley63 min
Apr 4, 4:42 AM CDTMesoscale DiscussionSPCCampbell, Clay, Fentress, Jackson, Macon, Morgan and 7 more93 min
Apr 4, 4:58 AM CDTSevere Thunderstorm WatchSPCAnderson, Bledsoe, Campbell, Claiborne, Hamilton, Hancock and 8 more5 hr
Apr 4, 7:41 AM CDTMesoscale DiscussionSPCAnderson, Campbell, Claiborne, Meigs, Morgan, Rhea and 3 more49 min

Nearby

Tornado Watches in Tennessee, 2014Tornado Watches in Alabama, 2014Tornado Watches in Mississippi, 2014Every tornado watch in 2014

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.