Alert archive / Texas / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 256

May 7, 200744 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 7, 2007, 8:37 PM CDT for 44 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2007, 8:37 PM CDT (01:37 UTC)
Expired
May 8, 2007, 4:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
50 kt
All 44 counties

Andrews County, TX, Borden County, TX, Briscoe County, TX, Childress County, TX, Coke County, TX, Cottle County, TX, Crane County, TX, Crockett County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Ector County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Gaines County, TX, Garza County, TX, Glasscock County, TX, Hall County, TX, Hardeman County, TX, Howard County, TX, Irion County, TX, Kent County, TX, King County, TX, Knox County, TX, Loving County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Reagan County, TX, Schleicher County, TX, Scurry County, TX, Sterling County, TX, Stonewall County, TX, Sutton County, TX, Terry County, TX, Tom Green County, TX, Upton County, TX, Ward County, TX, Winkler County, TX

The radar

The Lubbock radar (KLBB), 86 km from the middle of the area, began a volume at 01:39 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
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 7, 8:44 PM CDTSevere Thunderstorm WarningMAFMartin43 min
May 8, 3:32 AM CDTSevere Thunderstorm WarningLUBChildress28 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 00:00Z, 1.6 hours before the alert went out and 153 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 00:00Z on 2007-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 468 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 00:00Z on 2007-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 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
468 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1301 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 7, 7:15 PM CDTMesoscale DiscussionSPCCollin, Cooke, Delta, Fannin, Franklin, Grayson and 6 more60 min
May 7, 7:32 PM CDTTornado WatchSPCCamp, Clay, Collin, Cooke, Delta, Denton and 15 more7 hr
May 7, 9:23 PM CDTMesoscale DiscussionSPCBandera, Dimmit, Edwards, Frio, Kerr, Kinney and 8 more67 min
May 7, 9:45 PM CDTMesoscale DiscussionSPCCamp, Clay, Collin, Cooke, Delta, Denton and 15 more60 min
May 7, 11:15 PM CDTMesoscale DiscussionSPCAndrews, Borden, Cochran, Crosby, Dawson, Dickens and 12 more60 min
May 7, 11:43 PM CDTMesoscale DiscussionSPCAndrews, Borden, Cochran, Crosby, Dawson, Dickens and 17 more62 min
May 8, 11:19 AM CDTMesoscale DiscussionSPCBorden, Callahan, Coke, Crane, Ector, Fisher and 20 more116 min
May 8, 12:01 PM CDTTornado WatchSPCAndrews, Borden, Brewster, Coke, Crane, Crockett and 27 more7 hr
May 8, 2:44 PM CDTMesoscale DiscussionSPCCoke, Crockett, Fisher, Glasscock, Irion, Mitchell and 6 more91 min
May 8, 2:46 PM CDTMesoscale DiscussionSPCArcher, Baylor, Bosque, Brown, Callahan, Clay and 33 more2 hr
May 8, 3:41 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Brown, Callahan, Clay, Coleman and 28 more6 hr
May 8, 5:09 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Hardeman, Jack, Jones and 8 more96 min
May 8, 5:29 PM CDTTornado WatchSPCArcher, Baylor, Clay, Haskell, Jack, Montague and 8 more5 hr
May 8, 6:13 PM CDTMesoscale DiscussionSPCBandera, Edwards, Kerr, Kinney, Medina, Real and 2 more62 min
May 8, 6:58 PM CDTSevere Thunderstorm WatchSPCBandera, Dimmit, Edwards, Gillespie, Kendall, Kerr and 8 more4 hr

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.