Alert archive / Texas / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 288

May 12, 201139 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 12, 2011, 7:52 AM CDT for 39 counties in Texas. It took effect at May 12, 2011, 7:58 AM CDT. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
May 12, 2011, 7:52 AM CDT (12:52 UTC)
In effect from
May 12, 2011, 7:58 AM CDT
Expired
May 12, 2011, 5:00 PM CDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 39 counties

Aransas County, TX, Atascosa County, TX, Bandera County, TX, Bee County, TX, Bexar County, TX, Brooks County, TX, Calhoun County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Jim Hogg County, TX, Jim Wells County, TX, Karnes County, TX, Kendall County, TX, Kenedy County, TX, Kerr County, TX, Kinney County, TX, Kleberg County, TX, La Salle County, TX, Live Oak County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Nueces County, TX, Real County, TX, Refugio County, TX, San Patricio County, TX, Starr County, TX, Uvalde County, TX, Victoria County, TX, Webb County, TX, Wilson County, TX, Zapata County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 150 km from the middle of the area, began a volume at 12:52 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
40%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 12, 8:05 AM CDTSevere Thunderstorm WarningEWXDimmit, Kinney, Maverick, Medina, Uvalde, Zavala40 min
May 12, 8:26 AM CDTTornado WarningEWXDimmit, Maverick, Zavala49 min
May 12, 8:41 AM CDTSevere Thunderstorm WarningEWXBandera, Bexar, Comal, Dimmit, Frio, Kendall and 5 more64 min
May 12, 9:03 AM CDTSevere Thunderstorm WarningEWXAtascosa, Bexar, Medina42 min
May 12, 9:07 AM CDTTornado WarningEWXMedina23 min
May 12, 9:11 AM CDTSevere Thunderstorm WarningEWXBlanco, Burnet, Comal, Gillespie, Hays, Kendall and 3 more64 min
May 12, 9:20 AM CDTSevere Thunderstorm WarningEWXDimmit40 min
May 12, 9:27 AM CDTSevere Thunderstorm WarningCRPLa Salle, Webb63 min
May 12, 9:36 AM CDTSevere Thunderstorm WarningEWXBexar, Comal, Guadalupe, Medina54 min
May 12, 9:46 AM CDTSevere Thunderstorm WarningEWXAtascosa, Bexar, Blanco, Caldwell, Comal, Frio and 5 more59 min
May 12, 9:50 AM CDTSevere Thunderstorm WarningEWXAtascosa, Dimmit, Frio, Zavala55 min
May 12, 10:07 AM CDTSevere Thunderstorm WarningEWXDimmit38 min
May 12, 10:16 AM CDTFlash Flood WarningEWXBexar104 min
May 12, 10:29 AM CDTSevere Thunderstorm WarningCRPLa Salle, McMullen, Webb61 min
May 12, 10:37 AM CDTSevere Thunderstorm WarningEWXAtascosa, Bastrop, Caldwell, DeWitt, Fayette, Gonzales and 4 more53 min
May 12, 10:58 AM CDTSevere Thunderstorm WarningEWXBastrop, Caldwell, Fayette, Gonzales, Lavaca, Lee and 1 more47 min
May 12, 11:28 AM CDTSevere Thunderstorm WarningEWXAtascosa, Bastrop, Caldwell, DeWitt, Fayette, Gonzales and 3 more47 min
May 12, 11:30 AM CDTSevere Thunderstorm WarningCRPLa Salle, Webb60 min
May 12, 11:32 AM CDTTornado WarningEWXFayette, Gonzales, Lavaca28 min
May 12, 12:09 PM CDTFlash Flood WarningCRPWebb111 min
May 12, 12:29 PM CDTSevere Thunderstorm WarningCRPWebb41 min
May 12, 1:02 PM CDTSevere Thunderstorm WarningCRPAransas, Bee, Nueces, Refugio, San Patricio58 min
May 12, 1:23 PM CDTSevere Thunderstorm WarningCRPAransas, Calhoun, Refugio, Victoria52 min
May 12, 2:34 PM CDTSevere Thunderstorm WarningBROBrooks26 min
May 12, 3:02 PM CDTSevere Thunderstorm WarningBROBrooks, Kenedy28 min
May 12, 3:17 PM CDTFlash Flood WarningBROBrooks63 min
May 12, 3:22 PM CDTSevere Thunderstorm WarningCRPKleberg38 min
May 12, 3:29 PM CDTSevere Thunderstorm WarningBROBrooks, Kenedy46 min
May 12, 3:35 PM CDTSevere Thunderstorm WarningBROKenedy40 min
May 12, 3:57 PM CDTSevere Thunderstorm WarningCRPKleberg37 min
May 12, 4:11 PM CDTSevere Thunderstorm WarningBROKenedy19 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

Corpus Christi, TX (KCRP), launched 12:00Z, 0.9 hours before the alert went out and 186 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, Corpus Christi, TX at 12:00Z on 2011-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2980 joules per kilogram.LCLEL10008507005003002001001 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, Corpus Christi, TX at 12:00Z on 2011-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 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
2980 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
458 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
2.9
Supercell composite
13.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 11, 7:43 PM CDTMesoscale DiscussionSPCAnderson, Bell, Blanco, Bowie, Burnet, Camp and 20 more62 min
May 11, 11:25 PM CDTMesoscale DiscussionSPCAustin, Bandera, Bastrop, Bexar, Brazos, Burleson and 27 more65 min
May 12, 2:57 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 25 more33 min
May 12, 3:18 AM CDTSevere Thunderstorm WatchSPCBandera, Dimmit, Edwards, Frio, Kerr, Kinney and 7 more5 hr
May 12, 7:27 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bee, Bexar, Brooks, Dimmit and 26 more33 min
May 12, 8:46 AM CDTMesoscale DiscussionSPCBastrop, Bell, Bosque, Brazos, Burleson, Caldwell and 22 more59 min
May 12, 9:02 AM CDTSevere Thunderstorm WatchSPCAnderson, Austin, Bastrop, Bell, Blanco, Bosque and 53 more6 hr
May 12, 11:43 AM CDTMesoscale DiscussionSPCAnderson, Aransas, Austin, Bee, Brazos, Burleson and 33 more92 min
May 12, 1:46 PM CDTMesoscale DiscussionSPCFannin, Grayson, Lamar119 min
May 12, 3:17 PM CDTSevere Thunderstorm WatchSPCCooke, Fannin, Grayson, Lamar, Montague, Red River7 hr
May 12, 6:30 PM CDTMesoscale DiscussionSPCCooke, Fannin, Grayson, Lamar90 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.