Alert archive / Texas / Tornado Watches in 2009

Tornado Watch 778

October 29, 200917 counties in Oklahoma; 24 counties in Texas

The Storm Prediction Center issued this tornado watch at Oct 29, 2009, 1:19 AM CDT for 17 counties in Oklahoma; 24 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Oct 29, 2009, 1:19 AM CDT (06:19 UTC)
Expired
Oct 29, 2009, 7:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 41 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Garvin County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Grayson County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Navarro County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Van Zandt County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 162 km from the middle of the area, began a volume at 06:20 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
30%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
50%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 29, 6:40 AM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Murray, Stephens50 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

Fort Worth, TX (KFWD), launched 00:00Z, 6.3 hours before the alert went out and 152 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 00:00Z on 2009-10-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 947 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 00:00Z on 2009-10-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 484 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
947 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
602 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
484 m²/s²
0-3 km storm-relative helicity
599 m²/s²
Significant tornado parameter
3.4
Supercell composite
18.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 28, 7:12 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harmon, Roger Mills93 min
Oct 29, 1:07 AM CDTMesoscale DiscussionSPCCarter, Comanche, Cotton, Jefferson, Johnston, Love and 4 more53 min
Oct 29, 1:59 AM CDTTornado WatchSPCBlaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 13 more5 hr
Oct 29, 3:40 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Caddo, Canadian, Carter, Choctaw and 22 more95 min
Oct 29, 5:31 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Cleveland, Coal, Garvin and 8 more89 min
Oct 29, 6:43 AM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Cherokee, Choctaw, Coal and 29 more5 hr
Oct 29, 10:02 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Cherokee, Choctaw, Coal, Craig and 21 more118 min
Oct 29, 11:51 AM CDTTornado WatchSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Coal and 10 more6 hr
Oct 29, 1:57 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Choctaw, Haskell, Latimer, LeFlore and 6 more2 hr
Oct 29, 5:03 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Haskell, LeFlore, McCurtain, Muskogee and 1 more57 min
Oct 29, 5:19 AM CDTMesoscale DiscussionSPCAustin, Brazos, Burleson, Chambers, Fort Bend, Grimes and 13 more86 min
Oct 29, 10:48 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Bell, Bosque, Brazos, Burleson and 65 more117 min
Oct 29, 1:14 PM CDTTornado WatchSPCAngelina, Bowie, Brazos, Burleson, Cass, Grimes and 23 more8 hr
Oct 29, 3:03 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Camp, Cass, Cherokee, Gregg and 24 more117 min
Oct 29, 5:24 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Brazos, Burleson, Cass, Grimes and 23 more66 min

Nearby

Tornado Watches in Texas, 2009Tornado Watches in Oklahoma, 2009Every tornado watch in 2009

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.