Alert archive / Texas / Tornado Watches in 2010

Tornado Watch 86

April 23, 201045 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 23, 2010, 9:34 PM CDT for 45 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 2010, 9:34 PM CDT (02:34 UTC)
Expired
Apr 24, 2010, 4:25 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 45 counties

Atascosa County, TX, Austin County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Fayette County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Houston County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lavaca County, TX, Lee County, TX, Llano County, TX, Madison County, TX, Maverick County, TX, Medina County, TX, Montgomery County, TX, Polk County, TX, Real County, TX, San Jacinto County, TX, Travis County, TX, Trinity County, TX, Uvalde County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 38 km from the middle of the area, began a volume at 02:34 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
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
30%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 23, 9:47 PM CDTSevere Thunderstorm WarningEWXEdwards, Real58 min
Apr 23, 9:49 PM CDTSevere Thunderstorm WarningEWXUvalde56 min
Apr 23, 10:06 PM CDTSevere Thunderstorm WarningEWXEdwards, Kinney, Real, Uvalde, Val Verde39 min
Apr 23, 10:22 PM CDTSevere Thunderstorm WarningEWXMaverick, Uvalde, Zavala53 min
Apr 23, 10:29 PM CDTSevere Thunderstorm WarningEWXBandera, Medina, Uvalde46 min
Apr 23, 10:34 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano26 min
Apr 23, 10:39 PM CDTSevere Thunderstorm WarningEWXBandera, Kendall, Kerr51 min
Apr 23, 10:42 PM CDTSevere Thunderstorm WarningEWXEdwards, Kinney, Real, Uvalde48 min
Apr 23, 10:59 PM CDTSevere Thunderstorm WarningEWXBandera, Edwards, Kerr, Real, Uvalde46 min
Apr 23, 11:03 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano42 min
Apr 23, 11:09 PM CDTSevere Thunderstorm WarningEWXDimmit, Kinney, Maverick, Uvalde, Val Verde, Zavala51 min
Apr 23, 11:28 PM CDTSevere Thunderstorm WarningEWXBandera, Real, Uvalde34 min
Apr 23, 11:33 PM CDTSevere Thunderstorm WarningEWXMedina27 min
Apr 23, 11:56 PM CDTSevere Thunderstorm WarningEWXDimmit, Kinney, Maverick, Uvalde, Zavala49 min
Apr 24, 12:30 AM CDTFlash Flood WarningEWXZavala110 min
Apr 24, 12:35 AM CDTSevere Thunderstorm WarningEWXDimmit, Frio, Medina, Uvalde, Zavala40 min
Apr 24, 1:19 AM CDTSevere Thunderstorm WarningEWXAtascosa, Bexar41 min
Apr 24, 1:41 AM CDTSevere Thunderstorm WarningEWXBexar21 min
Apr 24, 1:49 AM CDTSevere Thunderstorm WarningEWXBexar, Comal, Guadalupe30 min
Apr 24, 1:51 AM CDTSevere Thunderstorm WarningEWXBexar, Comal, Guadalupe39 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 00:00Z, 2.6 hours before the alert went out and 240 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 00:00Z on 2010-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 417 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 00:00Z on 2010-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.1939587897117136Sfc1 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
417 J/kg
Mixed-layer CIN
-157 J/kg
Mixed-layer LCL
2624 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 7:57 PM CDTMesoscale DiscussionSPCBandera, Bell, Bexar, Blanco, Bosque, Brown and 38 more63 min
Apr 23, 11:16 PM CDTSevere Thunderstorm WatchSPCBosque, Collin, Coryell, Dallas, Denton, Ellis and 12 more4 hr
Apr 24, 1:20 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Camp, Cass, Cherokee, Gregg and 13 more25 min
Apr 24, 1:50 AM CDTTornado WatchSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more8 hr
Apr 24, 5:01 AM CDTMesoscale DiscussionSPCJasper, Newton, Sabine89 min
Apr 24, 6:15 AM CDTTornado WatchSPCHardin, Jasper, Jefferson, Newton, Orange, Tyler7 hr

Nearby

Tornado Watches in Texas, 2010Every tornado watch in 2010

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.