Alert archive / Texas / Tornado Watches in 2007

Tornado Watch 58

March 11, 200743 counties in Texas

The Storm Prediction Center issued this tornado watch at Mar 11, 2007, 5:16 PM CDT for 43 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Mar 11, 2007, 5:16 PM CDT (22:16 UTC)
Expired
Mar 12, 2007, 1:00 AM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
70 kt
All 43 counties

Atascosa County, TX, Bandera County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Brown County, TX, Burnet County, TX, Callahan County, TX, Coleman County, TX, Comal County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Dimmit County, TX, Eastland County, TX, Erath County, TX, Frio County, TX, Gillespie County, TX, Guadalupe County, TX, Hamilton County, TX, Hays County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, La Salle County, TX, Lampasas County, TX, Live Oak County, TX, Llano County, TX, Mason County, TX, Maverick County, TX, McCulloch County, TX, McMullen County, TX, Medina County, TX, Mills County, TX, Nolan County, TX, Runnels County, TX, San Saba County, TX, Taylor County, TX, Travis County, TX, Uvalde County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX

The radar

The San Angelo radar (KSJT), 145 km from the middle of the area, began a volume at 22:19 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
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 11, 5:54 PM CDTSevere Thunderstorm WarningSJTCoke, Runnels, Tom Green51 min
Mar 11, 5:56 PM CDTSevere Thunderstorm WarningEWXKerr28 min
Mar 11, 6:26 PM CDTSevere Thunderstorm WarningSJTConcho, McCulloch, Menard20 min
Mar 11, 6:42 PM CDTTornado WarningEWXBlanco, Gillespie33 min
Mar 11, 6:43 PM CDTSevere Thunderstorm WarningSJTColeman, McCulloch36 min
Mar 11, 7:12 PM CDTSevere Thunderstorm WarningEWXBlanco, Burnet63 min
Mar 11, 7:55 PM CDTFlash Flood WarningEWXComal, Kendall3 hr
Mar 11, 7:57 PM CDTFlash Flood WarningEWXBurnet3 hr
Mar 11, 8:07 PM CDTFlash Flood WarningEWXTravis3 hr
Mar 11, 8:13 PM CDTTornado WarningEWXBexar, Comal32 min
Mar 11, 8:19 PM CDTSevere Thunderstorm WarningEWXTravis41 min
Mar 11, 8:20 PM CDTSevere Thunderstorm WarningEWXGillespie55 min
Mar 11, 8:30 PM CDTSevere Thunderstorm WarningEWXWilliamson60 min
Mar 11, 8:45 PM CDTTornado WarningEWXComal30 min
Mar 11, 9:12 PM CDTTornado WarningEWXComal33 min
Mar 11, 9:36 PM CDTFlash Flood WarningEWXBandera, Kerr, Real3 hr
Mar 11, 9:55 PM CDTFlash Flood WarningEWXBurnet, Llano2 hr
Mar 11, 10:20 PM CDTFlash Flood WarningEWXCaldwell, Guadalupe3 hr
Mar 11, 10:20 PM CDTFlash Flood WarningEWXBlanco, Hays3 hr
Mar 11, 10:37 PM CDTFlash Flood WarningEWXBexar, Medina, Uvalde3 hr
Mar 11, 10:45 PM CDTSevere Thunderstorm WarningEWXMaverick60 min
Mar 11, 10:59 PM CDTFlash Flood WarningEWXBastrop, Travis3 hr
Mar 11, 11:03 PM CDTFlash Flood WarningEWXComal, Kendall3 hr
Mar 11, 11:09 PM CDTSevere Thunderstorm WarningEWXDimmit, Maverick66 min
Mar 12, 12:30 AM CDTSevere Thunderstorm WarningEWXBexar45 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, 10.3 hours before the alert went out and 202 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 2007-03-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 449 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 2007-03-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 square meters per square second.1939587897Sfc1 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
449 J/kg
Mixed-layer CIN
-247 J/kg
Mixed-layer LCL
575 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 11, 3:29 AM CDTMesoscale DiscussionSPCClay, Wichita, Wilbarger91 min
Mar 11, 10:18 AM CDTMesoscale DiscussionSPCBorden, Coke, Dawson, Garza, Glasscock, Howard and 13 more87 min
Mar 11, 1:58 PM CDTTornado WatchSPCBrewster, Coke, Crane, Crockett, Edwards, Irion and 13 more7 hr
Mar 11, 2:25 PM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Denton, Fannin and 10 more95 min
Mar 11, 4:50 PM CDTMesoscale DiscussionSPCBandera, Bell, Bexar, Blanco, Bosque, Brown and 33 more85 min
Mar 11, 5:27 PM CDTMesoscale DiscussionSPCConcho, Crockett, Edwards, Irion, Kimble, Menard and 7 more2 hr

Nearby

Tornado Watches in Texas, 2007Every tornado watch in 2007

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.