Alert archive / Texas / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 374

June 11, 201235 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 11, 2012, 3:52 PM CDT for 35 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 11, 2012, 3:52 PM CDT (20:52 UTC)
Expired
Jun 11, 2012, 11:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 35 counties

Archer County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Grayson County, TX, Hood County, TX, Irion County, TX, Jack County, TX, Johnson County, TX, Jones County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Sterling County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 21 km from the middle of the area, began a volume at 20:52 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
20%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
40%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 11, 4:21 PM CDTSevere Thunderstorm WarningSJTSterling39 min
Jun 11, 4:49 PM CDTSevere Thunderstorm WarningSJTCallahan56 min
Jun 11, 4:57 PM CDTSevere Thunderstorm WarningSJTSterling63 min
Jun 11, 5:21 PM CDTSevere Thunderstorm WarningSJTCoke, Sterling, Tom Green39 min
Jun 11, 5:26 PM CDTSevere Thunderstorm WarningSJTColeman, Concho, McCulloch64 min
Jun 11, 5:46 PM CDTSevere Thunderstorm WarningSJTCallahan, Coleman, Taylor59 min
Jun 11, 6:06 PM CDTSevere Thunderstorm WarningFWDStephens54 min
Jun 11, 6:07 PM CDTSevere Thunderstorm WarningSJTShackelford38 min
Jun 11, 6:20 PM CDTSevere Thunderstorm WarningSJTColeman40 min
Jun 11, 6:56 PM CDTSevere Thunderstorm WarningFWDStephens50 min
Jun 11, 7:20 PM CDTSevere Thunderstorm WarningSJTConcho, Menard40 min
Jun 11, 7:24 PM CDTSevere Thunderstorm WarningFWDYoung96 min
Jun 11, 7:43 PM CDTSevere Thunderstorm WarningSJTCallahan, Jones, Shackelford, Taylor34 min
Jun 11, 8:01 PM CDTSevere Thunderstorm WarningSJTConcho, Menard44 min
Jun 11, 8:26 PM CDTSevere Thunderstorm WarningOUNArcher, Clay64 min
Jun 11, 8:28 PM CDTSevere Thunderstorm WarningFWDJack77 min
Jun 11, 8:56 PM CDTSevere Thunderstorm WarningFWDYoung30 min
Jun 11, 9:09 PM CDTSevere Thunderstorm WarningOUNArcher, Baylor51 min
Jun 11, 9:14 PM CDTSevere Thunderstorm WarningFWDMontague32 min
Jun 11, 9:55 PM CDTSevere Thunderstorm WarningFWDCooke65 min
Jun 11, 10:01 PM CDTSevere Thunderstorm WarningOUNClay59 min
Jun 11, 10:56 PM CDTSevere Thunderstorm WarningFWDCooke49 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, 8.9 hours before the alert went out and 190 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 2012-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3217 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 2012-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 290 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
3217 J/kg
Mixed-layer CIN
-426 J/kg
Mixed-layer LCL
1113 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
290 m²/s²
0-3 km storm-relative helicity
354 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 11, 9:31 AM CDTMesoscale DiscussionSPCOttawa59 min
Jun 11, 3:59 PM CDTMesoscale DiscussionSPCAdair, Atoka, Cherokee, Cleveland, Coal, Creek and 22 more91 min
Jun 11, 3:32 PM CDTMesoscale DiscussionSPCCallahan, Coke, Coleman, Concho, Cooke, Eastland and 21 more58 min

Nearby

Severe Thunderstorm Watches in Texas, 2012Every severe thunderstorm watch in 2012

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.