Alert archive / Texas / Tornado Watches in 2014

Tornado Watch 76

April 13, 20149 counties in Arkansas; 17 parishes in Louisiana; 56 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 13, 2014, 5:13 PM CDT for 9 counties in Arkansas; 17 parishes in Louisiana; 56 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 13, 2014, 5:13 PM CDT (22:13 UTC)
Expired
Apr 13, 2014, 11:14 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
65 kt
All 82 counties

Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Anderson County, TX, Bell County, TX, Bosque County, TX, Bowie County, TX, Brown County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Collin County, TX, Comanche County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Hamilton County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Limestone County, TX, Marion County, TX, McLennan County, TX, Mills County, TX, Morris County, TX, Navarro County, TX, Palo Pinto County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 84 km from the middle of the area, began a volume at 22:17 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
50%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 13, 5:40 PM CDTSevere Thunderstorm WarningFWDMills80 min
Apr 13, 5:57 PM CDTSevere Thunderstorm WarningFWDComanche, Erath63 min
Apr 13, 6:53 PM CDTSevere Thunderstorm WarningFWDLampasas, Mills67 min
Apr 13, 7:54 PM CDTSevere Thunderstorm WarningFWDBell, Coryell, Lampasas66 min
Apr 13, 8:14 PM CDTSevere Thunderstorm WarningFWDCooke, Denton, Grayson, Montague, Wise61 min
Apr 13, 8:42 PM CDTSevere Thunderstorm WarningFWDBell63 min
Apr 13, 9:40 PM CDTSevere Thunderstorm WarningFWDBell, Milam65 min
Apr 13, 9:40 PM CDTSevere Thunderstorm WarningFWDFannin, Lamar50 min
Apr 13, 10:01 PM CDTSevere Thunderstorm WarningSHVHoward, Sevier59 min
Apr 13, 10:08 PM CDTTornado WarningSHVHoward, Sevier37 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

Fort Worth, TX (KFWD), launched 12:00Z, 10.2 hours before the alert went out and 97 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, Fort Worth, TX at 12:00Z on 2014-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 73 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, Fort Worth, TX at 12:00Z on 2014-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 334 square meters per square second.1939587897Sfc1 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
73 J/kg
Mixed-layer CIN
-284 J/kg
Mixed-layer LCL
635 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
334 m²/s²
0-3 km storm-relative helicity
439 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.

332 
WWUS20 KWNS 132215
SEL6  
SPC WW 132215
ARZ000-LAZ000-OKZ000-TXZ000-140500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 76
NWS STORM PREDICTION CENTER NORMAN OK
515 PM CDT SUN APR 13 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  SOUTHWESTERN ARKANSAS
  NORTHWESTERN LOUISIANA
  EXTREME SOUTHEASTERN OKLAHOMA
  CENTRAL....NORTH-CENTRAL AND NORTHEAST TEXAS

* EFFECTIVE THIS SUNDAY AFTERNOON FROM 515 PM UNTIL MIDNIGHT CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 3
    INCHES IN DIAMETER POSSIBLE
  ISOLATED SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 150 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF
WACO TEXAS TO 20 MILES NORTH NORTHEAST OF TEXARKANA ARKANSAS. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).

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 73...WW 74...WW 75...

DISCUSSION...SVR POTENTIAL EXPECTED TO INCREASE ACROSS THIS REGION
DURING NEXT FEW HOURS AS HODOGRAPHS ENLARGE...WITH DISCRETE
SUPERCELLS...CLUSTERS AND LINEAR/MIXED STORM MODES ALL POSSIBLE. 
INSTABILITY FIELDS WILL RANGE FROM MARGINAL TO FAVORABLE IN PATCHY
FASHION...BASED ON RATES OF RECOVERY FROM EARLIER CLOUD/PRECIP PLUME
THAT HAD BEEN OVER CENTRAL/N TX.  THAT PLUME -- NOW OVER PORTIONS
ARKLATEX REGION -- ALSO MAY CONTINUE TO SPAWN ISOLATED/EMBEDDED
SUPERCELLS AS IT SHIFTS NEWD.  DRYLINE/COLD-FRONTAL SVR THREAT WILL
SHIFT INTO THIS SAME AREA LATER THIS EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27030.


...EDWARDS

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 13, 2:34 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more2 hr
Apr 13, 4:13 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Crawford, Franklin and 9 more32 min
Apr 13, 4:27 PM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Madison, Marion and 3 more7 hr
Apr 13, 4:54 PM CDTMesoscale DiscussionSPCClark, Columbia, Hempstead, Howard, Lafayette, Little River and 4 more66 min
Apr 13, 6:01 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Madison, Marion and 3 more59 min
Apr 13, 6:25 PM CDTMesoscale DiscussionSPCClark, Conway, Crawford, Franklin, Garland, Hempstead and 15 more65 min
Apr 13, 12:26 PM CDTMesoscale DiscussionSPCWichita94 min
Apr 13, 1:43 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 7 more2 hr
Apr 13, 1:56 PM CDTTornado WatchSPCArcher, Clay, Cooke, Grayson, Jack, Montague and 3 more8 hr

Nearby

Tornado Watches in Texas, 2014Tornado Watches in Louisiana, 2014Tornado Watches in Arkansas, 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.