Alert archive / Texas / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 272

May 10, 201231 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 10, 2012, 12:32 PM CDT for 31 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 10, 2012, 12:32 PM CDT (17:32 UTC)
Expired
May 10, 2012, 8:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 31 counties

Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Concho County, TX, Edwards County, TX, Fayette County, TX, Gillespie County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Lavaca County, TX, Lee County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, Medina County, TX, Menard County, TX, Real County, TX, San Saba County, TX, Travis County, TX, Uvalde County, TX, Val Verde County, TX, Williamson County, TX

The radar

The Austin/San Antonio radar (KEWX), 98 km from the middle of the area, began a volume at 17:32 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
30%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 10, 1:15 PM CDTTornado WarningEWXGonzales, Karnes, Wilson45 min
May 10, 1:57 PM CDTTornado WarningEWXDeWitt, Gonzales, Karnes, Wilson33 min
May 10, 2:19 PM CDTFlash Flood WarningEWXAtascosa, DeWitt, Gonzales, Karnes, Wilson3 hr
May 10, 2:49 PM CDTFlash Flood WarningEWXBandera, Edwards, Kerr, Real, Uvalde3 hr
May 10, 4:39 PM CDTFlash Flood WarningEWXBandera, Gillespie, Kerr81 min
May 10, 4:52 PM CDTSevere Thunderstorm WarningEWXDeWitt, Gonzales, Karnes29 min
May 10, 5:58 PM CDTFlash Flood WarningEWXBandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 4 more3 hr
May 10, 5:58 PM CDTSevere Thunderstorm WarningEWXDimmit, Maverick, Uvalde, Zavala47 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

Del Rio, TX (KDRT), launched 12:00Z, 5.5 hours before the alert went out and 182 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, Del Rio, TX at 12:00Z on 2012-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1149 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, Del Rio, TX at 12:00Z on 2012-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 111 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
1149 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
663 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
111 m²/s²
0-3 km storm-relative helicity
185 m²/s²
Significant tornado parameter
1.7
Supercell composite
7.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 10:09 PM CDTMesoscale DiscussionSPCHidalgo, Kenedy, Willacy66 min
May 10, 5:27 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Brooks, Dimmit, Duval, Edwards and 19 more2 hr
May 10, 5:42 AM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bee, Bexar, Brooks, Cameron and 36 more7 hr
May 10, 9:51 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bee, Bexar, Brooks, Cameron and 39 more114 min
May 10, 11:40 AM CDTTornado WatchSPCAransas, Atascosa, Bee, Brooks, Calhoun, Cameron and 27 more8 hr
May 10, 11:52 AM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Brown, Coke, Coleman and 24 more53 min
May 10, 2:07 PM CDTMesoscale DiscussionSPCAransas, Atascosa, Bee, Brooks, DeWitt, Dimmit and 19 more113 min
May 10, 3:04 PM CDTMesoscale DiscussionSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more116 min
May 10, 5:21 PM CDTMesoscale DiscussionSPCCrockett, Edwards, Sutton, Terrell, Val Verde54 min
May 10, 5:43 PM CDTMesoscale DiscussionSPCAransas, Atascosa, Bee, Brooks, Cameron, DeWitt and 23 more2 hr

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.