Alert archive / Texas / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 151

April 17, 200739 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 17, 2007, 1:37 PM CDT for 39 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 17, 2007, 1:37 PM CDT (18:37 UTC)
Expired
Apr 17, 2007, 7:09 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 39 counties

Archer County, TX, Baylor County, TX, Borden County, TX, Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Comanche County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Eastland County, TX, Erath County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Hamilton County, TX, Haskell County, TX, Howard County, TX, Jack County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Mills County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Palo Pinto County, TX, Runnels County, TX, Scurry County, TX, Shackelford County, TX, Stephens County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 93 km from the middle of the area, began a volume at 18:39 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
20%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 17, 2:00 PM CDTSevere Thunderstorm WarningMAFScurry45 min
Apr 17, 2:21 PM CDTSevere Thunderstorm WarningLUBGarza34 min
Apr 17, 2:25 PM CDTSevere Thunderstorm WarningSJTFisher, Nolan50 min
Apr 17, 2:34 PM CDTSevere Thunderstorm WarningMAFScurry41 min
Apr 17, 2:51 PM CDTSevere Thunderstorm WarningMAFMitchell30 min
Apr 17, 3:04 PM CDTSevere Thunderstorm WarningSJTJones, Taylor56 min
Apr 17, 3:33 PM CDTSevere Thunderstorm WarningSJTColeman, Runnels42 min
Apr 17, 3:44 PM CDTSevere Thunderstorm WarningSJTCallahan, Shackelford46 min
Apr 17, 3:52 PM CDTSevere Thunderstorm WarningSJTShackelford, Throckmorton23 min
Apr 17, 4:01 PM CDTSevere Thunderstorm WarningFWDStephens59 min
Apr 17, 4:12 PM CDTSevere Thunderstorm WarningSJTBrown, Coleman48 min
Apr 17, 4:21 PM CDTSevere Thunderstorm WarningSJTBrown, Callahan, Coleman24 min
Apr 17, 4:27 PM CDTSevere Thunderstorm WarningSJTCallahan, Shackelford21 min
Apr 17, 4:43 PM CDTSevere Thunderstorm WarningSJTBrown, Callahan32 min
Apr 17, 4:51 PM CDTSevere Thunderstorm WarningSJTBrown29 min
Apr 17, 4:58 PM CDTSevere Thunderstorm WarningSJTBrown21 min
Apr 17, 5:02 PM CDTSevere Thunderstorm WarningFWDMills48 min
Apr 17, 5:55 PM CDTSevere Thunderstorm WarningFWDErath, Hood, Somervell65 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, 6.6 hours before the alert went out and 229 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 2007-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 169 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, Midland Regional, TX at 12:00Z on 2007-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -67 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
169 J/kg
Mixed-layer CIN
-183 J/kg
Mixed-layer LCL
683 m above ground
0-6 km bulk shear
79 kt
0-1 km storm-relative helicity
-67 m²/s²
0-3 km storm-relative helicity
-86 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 17, 12:47 PM CDTMesoscale DiscussionSPCArcher, Baylor, Borden, Bosque, Brown, Callahan and 43 more118 min
Apr 17, 2:59 PM CDTMesoscale DiscussionSPCArcher, Baylor, Borden, Bosque, Brown, Callahan and 56 more2 hr
Apr 17, 5:22 PM CDTMesoscale DiscussionSPCBell, Bosque, Burnet, Coryell, Dallas, Denton and 14 more83 min

Nearby

Severe Thunderstorm Watches in Texas, 2007Every severe thunderstorm 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.