Alert archive / Texas / Tornado Watches in 2006

Tornado Watch 887

December 29, 200615 counties in Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this tornado watch at Dec 29, 2006, 1:37 PM CST for 15 counties in Oklahoma; 25 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Dec 29, 2006, 1:37 PM CST (19:37 UTC)
Expired
Dec 29, 2006, 8:00 PM CST
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 40 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pontotoc County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Jack County, TX, Kaufman County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Stephens County, TX, Tarrant County, TX, Van Zandt County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 112 km from the middle of the area, began a volume at 19:37 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
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
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
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Dec 29, 1:41 PM CSTSevere Thunderstorm WarningFWDCooke, Denton64 min
Dec 29, 1:56 PM CSTFlash Flood WarningFWDTarrant3 hr
Dec 29, 3:11 PM CSTTornado WarningFWDJack, Palo Pinto49 min
Dec 29, 3:31 PM CSTSevere Thunderstorm WarningFWDTarrant, Wise44 min
Dec 29, 3:52 PM CSTSevere Thunderstorm WarningOUNArcher, Wichita28 min
Dec 29, 4:13 PM CSTFlash Flood WarningFWDJohnson, Tarrant3 hr
Dec 29, 4:16 PM CSTTornado WarningFWDTarrant44 min
Dec 29, 5:19 PM CSTFlash Flood WarningFWDDenton3 hr
Dec 29, 6:42 PM CSTSevere Thunderstorm WarningOUNJefferson, Stephens33 min
Dec 29, 7:13 PM CSTFlash Flood WarningFWDTarrant2 hr
Dec 29, 7:27 PM CSTFlash Flood WarningFWDHenderson, Kaufman, Navarro, Van Zandt3 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 7.6 hours before the alert went out and 132 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, Fort Worth, TX at 12:00Z on 2006-12-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 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, Fort Worth, TX at 12:00Z on 2006-12-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 231 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
13 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
648 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
231 m²/s²
0-3 km storm-relative helicity
256 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
Dec 29, 1:01 PM CSTMesoscale DiscussionSPCCimarron5 hr
Dec 29, 1:09 PM CSTMesoscale DiscussionSPCAtoka, Bryan, Caddo, Carter, Choctaw, Cleveland and 23 more66 min
Dec 29, 3:24 PM CSTMesoscale DiscussionSPCAtoka, Bryan, Carter, Coal, Comanche, Cotton and 8 more2 hr
Dec 29, 11:42 AM CSTMesoscale DiscussionSPCAustin, Bastrop, Bell, Blanco, Bosque, Brazos and 44 more3 hr
Dec 29, 12:42 PM CSTTornado WatchSPCAnderson, Aransas, Atascosa, Austin, Bastrop, Bee and 67 more5 hr
Dec 29, 5:09 PM CSTMesoscale DiscussionSPCAnderson, Angelina, Aransas, Austin, Bastrop, Bee and 75 more36 min
Dec 29, 5:38 PM CSTTornado WatchSPCAnderson, Angelina, Aransas, Austin, Bastrop, Bee and 67 more10 hr

Nearby

Tornado Watches in Texas, 2006Tornado Watches in Oklahoma, 2006Every tornado watch in 2006

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.