Alert archive / Texas / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 129

May 7, 201410 counties in Oklahoma; 19 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 7, 2014, 9:38 PM CDT for 10 counties in Oklahoma; 19 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2014, 9:38 PM CDT (02:38 UTC)
Expired
May 8, 2014, 3:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 29 counties

Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Grady County, OK, Jefferson County, OK, Kiowa County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Eastland County, TX, Haskell County, TX, Jack County, TX, Jones County, TX, Palo Pinto County, TX, Runnels County, TX, Shackelford County, TX, Stephens County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 48 km from the middle of the area, began a volume at 02:38 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
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
30%
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
30%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 7, 9:38 PM CDTSevere Thunderstorm WarningSJTTaylor52 min
May 7, 9:46 PM CDTSevere Thunderstorm WarningSJTHaskell, Jones, Shackelford, Throckmorton44 min
May 7, 9:53 PM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Grady52 min
May 7, 9:57 PM CDTSevere Thunderstorm WarningSJTCallahan, Shackelford, Taylor63 min
May 7, 10:17 PM CDTSevere Thunderstorm WarningFWDEastland, Stephens43 min
May 7, 10:18 PM CDTSevere Thunderstorm WarningOUNCaddo, Grady57 min
May 7, 10:36 PM CDTSevere Thunderstorm WarningFWDYoung39 min
May 7, 10:41 PM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Grady49 min
May 7, 11:20 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Grady40 min
May 7, 11:21 PM CDTSevere Thunderstorm WarningOUNCanadian, Cleveland, Grady, McClain, Oklahoma54 min
May 7, 11:29 PM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Cleveland, Grady, McClain, Oklahoma46 min
May 7, 11:42 PM CDTFlash Flood WarningOUNCanadian, Cleveland, Grady, McClain, Oklahoma3 hr
May 8, 12:12 AM CDTSevere Thunderstorm WarningOUNCanadian, Cleveland, Grady, McClain, Oklahoma48 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 00:00Z, 2.6 hours before the alert went out and 193 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 00:00Z on 2014-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 976 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 00:00Z on 2014-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
976 J/kg
Mixed-layer CIN
-221 J/kg
Mixed-layer LCL
1416 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
131 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 7, 11:12 PM CDTMesoscale DiscussionSPCCarter, Cleveland, Garvin, Grady, Jefferson, Love and 7 more93 min
May 8, 2:19 AM CDTMesoscale DiscussionSPCCaddo, Comanche, Cotton, Grady, Jackson, Kiowa and 1 more56 min
May 8, 3:22 PM CDTMesoscale DiscussionSPCKay113 min
May 7, 8:08 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Concho, Crockett and 14 more97 min
May 8, 1:11 PM CDTMesoscale DiscussionSPCBastrop, Bell, Blanco, Bosque, Brown, Burnet and 28 more2 hr
May 8, 5:39 PM CDTSevere Thunderstorm WatchSPCBell, Blanco, Burnet, Comal, Falls, Gillespie and 9 more4 hr

Nearby

Severe Thunderstorm Watches in Texas, 2014Severe Thunderstorm Watches in Oklahoma, 2014Every severe thunderstorm 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.