Alert archive / Texas / Tornado Watches in 2007

Tornado Watch 249

May 6, 200719 counties in Texas

The Storm Prediction Center issued this tornado watch at May 6, 2007, 7:55 PM CDT for 19 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2007, 7:55 PM CDT (00:55 UTC)
Expired
May 7, 2007, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt

Counties Coke County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Glasscock County, TX, Howard County, TX, Irion County, TX, McCulloch County, TX, Mitchell County, TX, Pecos County, TX, Reagan County, TX, Runnels County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Upton County, TX, Val Verde County, TX

The radar

The San Angelo radar (KSJT), 117 km from the middle of the area, began a volume at 00:55 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
30%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
20%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 6, 8:00 PM CDTSevere Thunderstorm WarningMAFReagan60 min
May 6, 8:15 PM CDTSevere Thunderstorm WarningSJTIrion45 min
May 6, 8:30 PM CDTSevere Thunderstorm WarningMAFPecos60 min
May 6, 8:30 PM CDTTornado WarningMAFReagan45 min
May 6, 8:51 PM CDTSevere Thunderstorm WarningSJTTom Green54 min
May 6, 9:09 PM CDTSevere Thunderstorm WarningSJTCoke, Runnels51 min
May 6, 9:21 PM CDTSevere Thunderstorm WarningSJTCrockett, Irion39 min
May 6, 9:24 PM CDTFlash Flood WarningMAFPecos3 hr
May 6, 9:24 PM CDTTornado WarningMAFPecos51 min
May 6, 9:46 PM CDTSevere Thunderstorm WarningSJTRunnels44 min
May 6, 9:52 PM CDTFlash Flood WarningSJTCoke4 hr
May 6, 10:11 PM CDTSevere Thunderstorm WarningMAFTerrell64 min
May 6, 10:13 PM CDTSevere Thunderstorm WarningMAFPecos62 min
May 6, 10:30 PM CDTSevere Thunderstorm WarningSJTCrockett60 min
May 6, 10:37 PM CDTSevere Thunderstorm WarningSJTColeman, Concho, Runnels53 min
May 6, 10:55 PM CDTFlash Flood WarningMAFReagan3 hr
May 6, 11:15 PM CDTSevere Thunderstorm WarningMAFPecos46 min
May 6, 11:24 PM CDTSevere Thunderstorm WarningMAFTerrell66 min
May 6, 11:29 PM CDTTornado WarningSJTCrockett61 min
May 6, 11:56 PM CDTSevere Thunderstorm WarningMAFReagan49 min
May 6, 11:58 PM CDTSevere Thunderstorm WarningSJTCrockett62 min
May 7, 12:07 AM CDTTornado WarningSJTIrion38 min
May 7, 12:25 AM CDTFlash Flood WarningMAFPecos3 hr
May 7, 12:48 AM CDTSevere Thunderstorm WarningSJTIrion, Tom Green57 min
May 7, 1:51 AM CDTSevere Thunderstorm WarningMAFTerrell54 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, 0.9 hours before the alert went out and 130 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 2007-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2007-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3064 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
133 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000
WWUS20 KWNS 070056
SEL9  
SPC WW 070056
TXZ000-070700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 249
NWS STORM PREDICTION CENTER NORMAN OK
755 PM CDT SUN MAY 6 2007

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

       SOUTHWEST TEXAS

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 755 PM UNTIL
200 AM CDT.

TORNADOES...HAIL TO 2.5 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 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES EAST SOUTHEAST OF
DRYDEN TEXAS TO 40 MILES EAST NORTHEAST OF BIG SPRING TEXAS.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 246...WW 247...WW 248...

DISCUSSION...TSTM CLUSTER WITH EMBEDDED SUPERCELLS EXPECTED TO
DEVELOP MAINLY WSW ALONG EXISTING SW TX CONFLUENCE ZONE.  SELY
NEAR-SFC FLOW WILL MAINTAIN RICH MOISTURE FEED...WITH 40 KT SWLY MID
LEVEL WINDS SUPPORTING ADDITIONAL SUSTAINED UPDRAFTS.  DEGREE OF
CAPE AND MOISTURE AVAILABILITY SUGGEST POTENTIAL FOR ISOLATED
TORNADOES IN ADDITION TO LARGE HAIL/HIGH WIND.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 07015.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 6, 7:04 PM CDTMesoscale DiscussionSPCCrockett, Irion, Reagan, Terrell, Upton56 min
May 6, 10:20 PM CDTMesoscale DiscussionSPCConcho, Irion, Reagan, Tom Green55 min
May 6, 11:04 PM CDTMesoscale DiscussionSPCArcher, Clay, Cooke, Fannin, Grayson, Lamar and 3 more56 min
May 6, 11:54 PM CDTTornado WatchSPCArcher, Baylor, Clay, Wichita, Wilbarger5 hr
May 7, 4:30 AM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Wichita, Wilbarger30 min
May 7, 10:29 AM CDTMesoscale DiscussionSPCCollin, Cooke, Denton, Fannin, Grayson, Jack and 4 more2 hr
May 7, 10:51 AM CDTTornado WatchSPCCollin, Cooke, Denton, Fannin, Grayson, Lamar and 2 more5 hr
May 7, 1:14 PM CDTMesoscale DiscussionSPCCrockett, Edwards, Irion, Kimble, Kinney, Menard and 6 more61 min
May 7, 1:59 PM CDTMesoscale DiscussionSPCCrockett, Edwards, Irion, Kimble, Kinney, Menard and 6 more61 min
May 7, 5:38 PM CDTMesoscale DiscussionSPCDimmit, Kinney, Maverick, Uvalde, Zavala67 min
May 7, 5:59 PM CDTTornado WatchSPCBandera, Dimmit, Edwards, Frio, Kerr, Kinney and 8 more8 hr
May 7, 6:19 PM CDTMesoscale DiscussionSPCBrewster, Crane, Ector, Jeff Davis, Midland, Pecos and 7 more86 min
May 7, 6:42 PM CDTTornado WatchSPCBrewster, Jeff Davis, Pecos, Presidio, Reeves, Terrell5 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.