Alert archive / Texas / Tornado Watches in 2009

Tornado Watch 781

October 29, 200916 counties in Oklahoma; 36 counties in Texas

The Storm Prediction Center issued this tornado watch at Oct 29, 2009, 11:51 AM CDT for 16 counties in Oklahoma; 36 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Oct 29, 2009, 11:51 AM CDT (16:51 UTC)
Expired
Oct 29, 2009, 6:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
70 kt
All 52 counties

Adair County, OK, Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK, Anderson County, TX, Bell County, TX, Camp County, TX, Cherokee County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Smith County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 186 km from the middle of the area, began a volume at 16:51 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
30%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
40%
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
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 29, 11:55 AM CDTSevere Thunderstorm WarningTSAMuskogee, Okmulgee, Tulsa, Wagoner50 min
Oct 29, 12:20 PM CDTSevere Thunderstorm WarningFWDCollin, Dallas, Hunt, Kaufman, Rockwall35 min
Oct 29, 12:28 PM CDTSevere Thunderstorm WarningTSAMcIntosh, Muskogee, Okmulgee47 min
Oct 29, 1:06 PM CDTSevere Thunderstorm WarningTSACherokee, Mayes, Muskogee, Wagoner39 min
Oct 29, 1:29 PM CDTSevere Thunderstorm WarningTSAChoctaw, Pushmataha61 min
Oct 29, 1:53 PM CDTTornado WarningTSAPushmataha30 min
Oct 29, 2:02 PM CDTSevere Thunderstorm WarningTSACherokee, Delaware, Mayes44 min
Oct 29, 2:51 PM CDTSevere Thunderstorm WarningTSAHaskell, Latimer39 min
Oct 29, 3:14 PM CDTSevere Thunderstorm WarningTSAHaskell, LeFlore, Muskogee, Sequoyah46 min
Oct 29, 5:55 PM CDTSevere Thunderstorm WarningSHVBowie, Camp, Cass, Gregg, Harrison, Marion and 2 more65 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

Norman, OK (KOUN), launched 12:00Z, 4.9 hours before the alert went out and 203 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, Norman, OK at 12:00Z on 2009-10-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1863 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, Norman, OK at 12:00Z on 2009-10-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 326 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
1863 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
515 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
326 m²/s²
0-3 km storm-relative helicity
380 m²/s²
Significant tornado parameter
4.6
Supercell composite
19.6

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, 1:19 AM CDTTornado WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Garvin and 11 more6 hr
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, 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.