Alert archive / Texas / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 534

June 21, 201190 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 21, 2011, 4:58 PM CDT for 90 counties in Texas. It was in force for 10 hr.

The area

The outline as issued.

The facts

Issued
Jun 21, 2011, 4:58 PM CDT (21:58 UTC)
Expired
Jun 22, 2011, 3:04 AM CDT
In force
10 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
65 kt
All 90 counties

Anderson County, TX, Angelina County, TX, Bell County, TX, Bosque County, TX, Brewster County, TX, Brown County, TX, Burnet County, TX, Callahan County, TX, Cherokee County, TX, Coke County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Crane County, TX, Crockett County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ector County, TX, Edwards County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Freestone County, TX, Gillespie County, TX, Glasscock County, TX, Gregg County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Irion County, TX, Jeff Davis County, TX, Johnson County, TX, Kaufman County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Midland County, TX, Milam County, TX, Mills County, TX, Nacogdoches County, TX, Navarro County, TX, Nolan County, TX, Palo Pinto County, TX, Panola County, TX, Parker County, TX, Pecos County, TX, Rains County, TX, Reagan County, TX, Real County, TX, Reeves County, TX, Robertson County, TX, Rockwall County, TX, Runnels County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Saba County, TX, Schleicher County, TX, Shelby County, TX, Smith County, TX, Somervell County, TX, Stephens County, TX, Sterling County, TX, Sutton County, TX, Tarrant County, TX, Taylor County, TX, Terrell County, TX, Tom Green County, TX, Trinity County, TX, Upton County, TX, Val Verde County, TX, Van Zandt County, TX, Ward County, TX, Williamson County, TX, Wood County, TX

The radar

The San Angelo radar (KSJT), 60 km from the middle of the area, began a volume at 22:00 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
80%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
95%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 21, 5:06 PM CDTSevere Thunderstorm WarningSJTCoke39 min
Jun 21, 5:16 PM CDTSevere Thunderstorm WarningSHVNacogdoches, Rusk, Sabine, San Augustine, Shelby44 min
Jun 21, 5:16 PM CDTSevere Thunderstorm WarningSJTCallahan, Coleman44 min
Jun 21, 5:27 PM CDTSevere Thunderstorm WarningFWDComanche, Eastland63 min
Jun 21, 5:46 PM CDTSevere Thunderstorm WarningSJTBrown, Coleman44 min
Jun 21, 5:59 PM CDTSevere Thunderstorm WarningSHVAngelina, Nacogdoches, Sabine, San Augustine, Shelby46 min
Jun 21, 6:00 PM CDTSevere Thunderstorm WarningFWDEastland30 min
Jun 21, 6:10 PM CDTSevere Thunderstorm WarningSJTRunnels20 min
Jun 21, 6:25 PM CDTSevere Thunderstorm WarningSJTCoke, Nolan50 min
Jun 21, 6:29 PM CDTSevere Thunderstorm WarningSJTBrown, Coleman46 min
Jun 21, 6:30 PM CDTSevere Thunderstorm WarningFWDEastland60 min
Jun 21, 6:33 PM CDTSevere Thunderstorm WarningSJTColeman42 min
Jun 21, 6:37 PM CDTSevere Thunderstorm WarningSJTSterling38 min
Jun 21, 6:45 PM CDTSevere Thunderstorm WarningSHVNacogdoches, Sabine, San Augustine, Shelby45 min
Jun 21, 6:47 PM CDTSevere Thunderstorm WarningFWDStephens58 min
Jun 21, 6:48 PM CDTSevere Thunderstorm WarningMAFGlasscock57 min
Jun 21, 6:58 PM CDTSevere Thunderstorm WarningFWDErath, Palo Pinto62 min
Jun 21, 6:59 PM CDTSevere Thunderstorm WarningSJTTom Green46 min
Jun 21, 7:04 PM CDTSevere Thunderstorm WarningSJTCallahan, Coleman, Runnels, Taylor56 min
Jun 21, 7:20 PM CDTSevere Thunderstorm WarningSJTTom Green40 min
Jun 21, 7:26 PM CDTSevere Thunderstorm WarningSHVAngelina, Sabine, San Augustine49 min
Jun 21, 7:27 PM CDTSevere Thunderstorm WarningFWDMills78 min
Jun 21, 7:27 PM CDTSevere Thunderstorm WarningSJTSterling, Tom Green33 min
Jun 21, 7:29 PM CDTSevere Thunderstorm WarningSJTBrown, Coleman, Concho, McCulloch, San Saba46 min
Jun 21, 7:32 PM CDTSevere Thunderstorm WarningSJTConcho, Runnels43 min
Jun 21, 7:55 PM CDTSevere Thunderstorm WarningMAFBrewster65 min
Jun 21, 7:57 PM CDTSevere Thunderstorm WarningFWDParker63 min
Jun 21, 8:00 PM CDTSevere Thunderstorm WarningSJTConcho, Irion, Runnels, Sterling, Tom Green60 min
Jun 21, 8:01 PM CDTSevere Thunderstorm WarningMAFGlasscock59 min
Jun 21, 8:06 PM CDTSevere Thunderstorm WarningSJTRunnels, Taylor39 min
Jun 21, 8:14 PM CDTSevere Thunderstorm WarningSJTSan Saba46 min
Jun 21, 8:16 PM CDTSevere Thunderstorm WarningSHVAngelina, Sabine, San Augustine29 min
Jun 21, 8:17 PM CDTSevere Thunderstorm WarningHGXHouston43 min
Jun 21, 8:17 PM CDTSevere Thunderstorm WarningMAFReagan58 min
Jun 21, 8:45 PM CDTSevere Thunderstorm WarningFWDHenderson, Van Zandt60 min
Jun 21, 9:10 PM CDTSevere Thunderstorm WarningMAFMidland, Upton65 min
Jun 21, 9:13 PM CDTSevere Thunderstorm WarningSJTIrion47 min
Jun 21, 9:20 PM CDTSevere Thunderstorm WarningFWDHamilton55 min
Jun 21, 9:25 PM CDTSevere Thunderstorm WarningFWDDenton, Parker, Tarrant, Wise65 min
Jun 21, 9:43 PM CDTSevere Thunderstorm WarningFWDBosque, Coryell62 min
Jun 21, 9:43 PM CDTSevere Thunderstorm WarningMAFCrane, Upton62 min
Jun 21, 10:16 PM CDTSevere Thunderstorm WarningFWDCollin, Dallas, Denton, Tarrant59 min
Jun 21, 10:23 PM CDTSevere Thunderstorm WarningFWDNavarro67 min
Jun 21, 10:29 PM CDTSevere Thunderstorm WarningFWDBell, Bosque, Coryell, Hill, McLennan76 min
Jun 21, 10:42 PM CDTSevere Thunderstorm WarningMAFCrane, Upton63 min
Jun 21, 11:05 PM CDTFlash Flood WarningFWDHenderson, Navarro4 hr
Jun 21, 11:16 PM CDTSevere Thunderstorm WarningMAFPecos, Reagan, Upton59 min
Jun 21, 11:17 PM CDTSevere Thunderstorm WarningFWDCollin, Dallas, Hunt, Kaufman, Rockwall58 min
Jun 21, 11:45 PM CDTSevere Thunderstorm WarningFWDFreestone, Limestone, Navarro60 min
Jun 21, 11:47 PM CDTTornado WarningFWDFreestone, Limestone, Navarro43 min
Jun 21, 11:49 PM CDTSevere Thunderstorm WarningEWXBlanco, Burnet, Comal, Hays, Kendall, Travis and 1 more56 min
Jun 22, 12:05 AM CDTSevere Thunderstorm WarningMAFCrane, Pecos, Upton55 min
Jun 22, 12:07 AM CDTSevere Thunderstorm WarningFWDDelta, Hopkins, Hunt, Kaufman, Rains, Van Zandt68 min
Jun 22, 12:43 AM CDTSevere Thunderstorm WarningFWDAnderson, Freestone, Henderson, Navarro77 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

Midland Regional, TX (KMAF), launched 12:00Z, 10.0 hours before the alert went out and 218 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, Midland Regional, TX at 12:00Z on 2011-06-21Temperature 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, Midland Regional, TX at 12:00Z on 2011-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 268 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
2672 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
268 m²/s²
0-3 km storm-relative helicity
328 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 7:56 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Jack, Montague, Stephens and 3 more94 min
Jun 20, 9:46 PM CDTSevere Thunderstorm WatchSPCArcher, Bosque, Clay, Collin, Comanche, Cooke and 30 more9 hr
Jun 21, 3:15 AM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coleman, Collin, Comanche and 39 more60 min
Jun 21, 3:43 PM CDTMesoscale DiscussionSPCAnderson, Bosque, Camp, Cass, Cherokee, Coryell and 32 more62 min
Jun 21, 6:21 PM CDTMesoscale DiscussionSPCCollin, Dallas, Delta, Denton, Ellis, Fannin and 15 more54 min
Jun 21, 6:59 PM CDTMesoscale DiscussionSPCAngelina, Cherokee, Hardin, Houston, Jasper, Liberty and 10 more61 min

Nearby

Severe Thunderstorm Watches in Texas, 2011Every severe thunderstorm watch in 2011

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.