Alert archive / Texas / Tornado Watches in 2007

Tornado Watch 27

February 23, 200710 counties in Kansas; 11 counties in Oklahoma; 27 counties in Texas

The Storm Prediction Center issued this tornado watch at Feb 23, 2007, 3:11 PM CST for 10 counties in Kansas; 11 counties in Oklahoma; 27 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Feb 23, 2007, 3:11 PM CST (21:11 UTC)
Expired
Feb 23, 2007, 10:00 PM CST
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 48 counties

Clark County, KS, Comanche County, KS, Ford County, KS, Grant County, KS, Gray County, KS, Haskell County, KS, Kiowa County, KS, Meade County, KS, Seward County, KS, Stevens County, KS, Beaver County, OK, Beckham County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Roger Mills County, OK, Texas County, OK, Woods County, OK, Woodward County, OK, Armstrong County, TX, Briscoe County, TX, Carson County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hardeman County, TX, Hemphill County, TX, Hutchinson County, TX, Kent County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Motley County, TX, Ochiltree County, TX, Roberts County, TX, Stonewall County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 121 km from the middle of the area, began a volume at 21:13 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
50%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
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
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Feb 23, 4:48 PM CSTSevere Thunderstorm WarningAMADonley27 min
Feb 23, 5:15 PM CSTSevere Thunderstorm WarningLUBBriscoe, Hall30 min
Feb 23, 5:22 PM CSTSevere Thunderstorm WarningAMADonley, Gray53 min
Feb 23, 6:08 PM CSTTornado WarningAMAGray, Wheeler37 min
Feb 23, 6:17 PM CSTSevere Thunderstorm WarningAMALipscomb43 min
Feb 23, 6:27 PM CSTSevere Thunderstorm WarningAMACollingsworth63 min
Feb 23, 6:32 PM CSTSevere Thunderstorm WarningOUNEllis, Harper43 min
Feb 23, 6:52 PM CSTSevere Thunderstorm WarningAMABeaver38 min
Feb 23, 7:16 PM CSTSevere Thunderstorm WarningAMAOchiltree29 min
Feb 23, 7:26 PM CSTSevere Thunderstorm WarningDDCClark43 min
Feb 23, 7:45 PM CSTSevere Thunderstorm WarningAMATexas45 min
Feb 23, 8:26 PM CSTSevere Thunderstorm WarningDDCSeward49 min
Feb 23, 8:27 PM CSTSevere Thunderstorm WarningOUNWoodward48 min
Feb 23, 8:58 PM CSTSevere Thunderstorm WarningAMAHemphill, Wheeler62 min
Feb 23, 9:02 PM CSTTornado WarningOUNWoodward28 min
Feb 23, 9:10 PM CSTSevere Thunderstorm WarningOUNEllis, Roger Mills35 min
Feb 23, 9:18 PM CSTSevere Thunderstorm WarningDDCMeade42 min
Feb 23, 9:28 PM CSTSevere Thunderstorm WarningOUNWoods, Woodward47 min
Feb 23, 9:42 PM CSTSevere Thunderstorm WarningOUNEllis18 min
Feb 23, 9:47 PM CSTSevere Thunderstorm WarningOUNRoger Mills28 min
Feb 23, 9:52 PM CSTTornado WarningDDCGray, Meade23 min
Feb 23, 9:54 PM CSTSevere Thunderstorm WarningDDCGray, Haskell51 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 9.2 hours before the alert went out and 121 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, Amarillo Airport, TX at 12:00Z on 2007-02-23Temperature 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, Amarillo Airport, TX at 12:00Z on 2007-02-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 126 square meters per square second.1939587897117Sfc1 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
3061 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
126 m²/s²
0-3 km storm-relative helicity
116 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 232112
SEL7  
SPC WW 232112
KSZ000-OKZ000-TXZ000-240400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 27
NWS STORM PREDICTION CENTER NORMAN OK
310 PM CST FRI FEB 23 2007

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

       PARTS OF SOUTHWEST KANSAS
       PARTS OF WESTERN OKLAHOMA
       LARGE PART OF EASTERN TEXAS PANHANDLE

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 310 PM UNTIL
1000 PM CST.

TORNADOES...HAIL TO 2 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 5 MILES NORTHWEST OF DODGE
CITY KANSAS TO 70 MILES SOUTHEAST OF LUBBOCK 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.

DISCUSSION...APPROACH OF VERY STRONG UPPER TROUGH/MID LEVEL JET AND
RAPID ADVECTION OF LOW LEVEL MOISTURE WILL SUPPORT INCREASING
POTENTIAL F0R SUPERCELL DEVELOPMENT THROUGH THE EVENING.  INITIAL
STORMS EXPECTED ALONG/JUST E OF N/S DRY LINE TX  PANHANDLE AND THEN
MOVING RAPIDLY NEWD INTO SWRN KS.  ALONG WITH LARGE HAIL...THE VERY
STRONG SHEAR PROFILES SUPPORT TORNADO POTENTIAL WITH ANY SUPERCELL.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 24040.


...HALES

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 23, 1:54 PM CSTMesoscale DiscussionSPCBorden, Briscoe, Childress, Collingsworth, Cottle, Crosby and 13 more2 hr
Feb 23, 5:51 PM CSTMesoscale DiscussionSPCBorden, Coke, Concho, Crockett, Dawson, Fisher and 17 more114 min

Nearby

Tornado Watches in Texas, 2007Tornado Watches in Oklahoma, 2007Tornado Watches in Kansas, 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.