Alert archive / Texas / Tornado Watches in 2007

Tornado Watch 167

April 23, 200740 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 23, 2007, 5:35 PM CDT for 40 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 2007, 5:35 PM CDT (22:35 UTC)
Expired
Apr 23, 2007, 11:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 40 counties

Baylor County, TX, Borden County, TX, Callahan County, TX, Coke County, TX, Cottle County, TX, Crane County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Ector County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Glasscock County, TX, Hale County, TX, Hardeman County, TX, Haskell County, TX, Howard County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox 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, Runnels County, TX, Scurry County, TX, Shackelford County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Upton County, TX, Wilbarger County, TX

The radar

The Lubbock radar (KLBB), 89 km from the middle of the area, began a volume at 22:37 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
40%
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
60%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 23, 5:40 PM CDTSevere Thunderstorm WarningMAFHoward65 min
Apr 23, 6:08 PM CDTSevere Thunderstorm WarningMAFBorden67 min
Apr 23, 6:28 PM CDTTornado WarningMAFHoward, Mitchell47 min
Apr 23, 6:51 PM CDTSevere Thunderstorm WarningLUBGarza, Kent39 min
Apr 23, 6:56 PM CDTSevere Thunderstorm WarningMAFMitchell, Scurry64 min
Apr 23, 7:01 PM CDTSevere Thunderstorm WarningMAFScurry30 min
Apr 23, 7:07 PM CDTTornado WarningMAFMitchell, Scurry53 min
Apr 23, 7:40 PM CDTTornado WarningSJTFisher, Nolan50 min
Apr 23, 7:58 PM CDTTornado WarningMAFMitchell17 min
Apr 23, 8:14 PM CDTSevere Thunderstorm WarningLUBGarza61 min
Apr 23, 8:28 PM CDTTornado WarningSJTFisher, Nolan47 min
Apr 23, 8:44 PM CDTSevere Thunderstorm WarningLUBKent61 min
Apr 23, 9:06 PM CDTTornado WarningSJTFisher, Jones, Nolan, Taylor54 min
Apr 23, 9:15 PM CDTSevere Thunderstorm WarningLUBGarza60 min
Apr 23, 9:39 PM CDTSevere Thunderstorm WarningLUBCrosby43 min
Apr 23, 9:45 PM CDTSevere Thunderstorm WarningLUBKent60 min
Apr 23, 9:58 PM CDTTornado WarningSJTJones32 min
Apr 23, 10:06 PM CDTTornado WarningLUBKent54 min
Apr 23, 10:17 PM CDTSevere Thunderstorm WarningLUBDickens58 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, 10.6 hours before the alert went out and 188 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 2007-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 820 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 2007-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 196 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
820 J/kg
Mixed-layer CIN
-206 J/kg
Mixed-layer LCL
1281 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
196 m²/s²
0-3 km storm-relative helicity
198 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000
WWUS20 KWNS 232238
SEL7  
SPC WW 232238
TXZ000-240400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 167
NWS STORM PREDICTION CENTER NORMAN OK
535 PM CDT MON APR 23 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       WEST CENTRAL INTO NORTHWEST TEXAS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 535 PM UNTIL
1100 PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 60 MILES EAST NORTHEAST OF
PLAINVIEW TEXAS TO 75 MILES SOUTHEAST OF BIG SPRING TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 165...WW 166...

DISCUSSION...SRN STREAM SHORTWAVE TROUGH NOW MOVING INTO SWRN TX MAY
CONTINUE ENHANCING THUNDERSTORM DEVELOPMENT ALONG AND EAST OF THE
DRY LINE THIS EVENING.  DEEP LAYER SHEAR REMAINS QUITE STRONG AND
WILL SUSTAIN SUPERCELLS...WITH INCREASING POTENTIAL FOR A FEW
TORNADOES IF STORMS CAN BE SUSTAINED ENEWD ACROSS WW THIS EVENING. 
VERY LARGE HAIL IS ALSO LIKELY WITH THESE STORMS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 22025.


...EVANS

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 2:02 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 15 more103 min
Apr 23, 3:44 PM CDTTornado WatchSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Donley and 14 more6 hr
Apr 23, 5:19 PM CDTMesoscale DiscussionSPCBorden, Coke, Concho, Cottle, Crosby, Dawson and 31 more56 min
Apr 23, 5:40 PM CDTMesoscale DiscussionSPCCrockett, Dimmit, Edwards, Kerr, Kimble, Kinney and 6 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.