Alert archive / Oklahoma / Tornado Watches in 2018

Tornado Watch 429

November 30, 201854 counties in Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this tornado watch at Nov 30, 2018, 5:23 PM CST for 54 counties in Oklahoma; 25 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Nov 30, 2018, 5:23 PM CST (23:23 UTC)
Expired
Dec 1, 2018, 1:00 AM CST
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 79 counties

Adair County, OK, Atoka County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kingfisher County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Archer County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Kaufman County, TX, Lamar County, TX, Montague County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Tarrant County, TX, Van Zandt County, TX, Wichita County, TX, Wise County, TX

The radar

The Altus AFB radar (KFDR), 136 km from the middle of the area, began a volume at 23:26 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
40%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Nov 30, 5:23 PM CSTSevere Thunderstorm WarningOUNCotton, Jefferson52 min
Nov 30, 6:20 PM CSTSevere Thunderstorm WarningTSAAdair, Delaware35 min
Nov 30, 6:28 PM CSTSevere Thunderstorm WarningFWDJack, Palo Pinto, Stephens, Young62 min
Nov 30, 6:48 PM CSTSevere Thunderstorm WarningOUNCanadian, Cleveland, Grady, McClain, Oklahoma42 min
Nov 30, 7:04 PM CSTSevere Thunderstorm WarningOUNComanche, Cotton, Tillman41 min
Nov 30, 7:08 PM CSTSevere Thunderstorm WarningOUNClay22 min
Nov 30, 7:21 PM CSTSevere Thunderstorm WarningFWDJack, Palo Pinto, Parker, Wise54 min
Nov 30, 7:38 PM CSTSevere Thunderstorm WarningOUNCaddo, Comanche32 min
Nov 30, 7:45 PM CSTSevere Thunderstorm WarningOUNComanche, Cotton, Grady, Stephens45 min
Nov 30, 8:04 PM CSTSevere Thunderstorm WarningFWDDenton, Parker, Tarrant, Wise56 min
Nov 30, 8:30 PM CSTSevere Thunderstorm WarningTSAHaskell, Latimer, McIntosh, Muskogee, Pittsburg60 min
Nov 30, 8:32 PM CSTSevere Thunderstorm WarningTSACreek, Osage, Pawnee, Tulsa58 min
Nov 30, 8:33 PM CSTSevere Thunderstorm WarningOUNLincoln13 min
Nov 30, 8:35 PM CSTSevere Thunderstorm WarningOUNCarter, Johnston, Murray, Pontotoc25 min
Nov 30, 8:41 PM CSTTornado WarningTSAHaskell, Muskogee, Pittsburg49 min
Nov 30, 9:07 PM CSTSevere Thunderstorm WarningTSAOsage, Pawnee, Washington53 min
Nov 30, 9:12 PM CSTSevere Thunderstorm WarningTSACreek, Muskogee, Nowata, Okfuskee, Okmulgee, Osage and 4 more63 min
Nov 30, 9:14 PM CSTSevere Thunderstorm WarningOUNAtoka, Bryan, Coal, Johnston46 min
Nov 30, 9:19 PM CSTSevere Thunderstorm WarningTSAAdair, Cherokee, Haskell, Muskogee, Sequoyah41 min
Nov 30, 9:20 PM CSTSevere Thunderstorm WarningFWDCollin, Denton, Grayson42 min
Nov 30, 9:26 PM CSTTornado WarningTSAAdair, Cherokee, Haskell, Muskogee, Sequoyah49 min
Nov 30, 9:39 PM CSTTornado WarningTSANowata, Rogers, Tulsa, Washington25 min
Nov 30, 9:44 PM CSTSevere Thunderstorm WarningFWDDallas, Tarrant61 min
Nov 30, 9:49 PM CSTSevere Thunderstorm WarningTSAChoctaw, Latimer, Pittsburg, Pushmataha56 min
Nov 30, 9:59 PM CSTTornado Warning Tornado observedConsiderable damage threatTSAAdair, Cherokee46 min
Nov 30, 10:00 PM CSTSevere Thunderstorm WarningFWDCollin, Dallas, Rockwall45 min
Nov 30, 10:01 PM CSTSevere Thunderstorm WarningTSACraig, Nowata, Washington44 min
Nov 30, 10:08 PM CSTTornado WarningTSALatimer, Pushmataha23 min
Nov 30, 10:12 PM CSTSevere Thunderstorm WarningTSACraig, Mayes, Nowata, Rogers, Wagoner63 min
Nov 30, 10:14 PM CSTSevere Thunderstorm WarningTSACherokee, Haskell, McIntosh, Muskogee, Pittsburg, Sequoyah and 1 more46 min
Nov 30, 10:18 PM CSTSevere Thunderstorm WarningTSAHaskell, Latimer, LeFlore, Pushmataha, Sequoyah57 min
Nov 30, 10:25 PM CSTSevere Thunderstorm WarningFWDCollin, Hopkins, Hunt, Kaufman, Rains, Rockwall and 1 more80 min
Nov 30, 10:29 PM CSTTornado Warning Tornado observedConsiderable damage threatTSAAdair, Delaware20 min
Nov 30, 10:34 PM CSTTornado WarningFWDHunt, Kaufman, Rains, Rockwall, Van Zandt41 min
Nov 30, 10:39 PM CSTSevere Thunderstorm WarningTSAAdair, Cherokee, Delaware, Haskell, Sequoyah53 min
Nov 30, 10:50 PM CSTSevere Thunderstorm WarningTSALeFlore, Sequoyah55 min
Nov 30, 10:52 PM CSTSevere Thunderstorm WarningTSACherokee, Craig, Delaware, Mayes, Ottawa, Wagoner53 min
Nov 30, 11:09 PM CSTTornado WarningTSASequoyah21 min
Nov 30, 11:12 PM CSTSevere Thunderstorm WarningFWDKaufman, Rains, Van Zandt63 min
Nov 30, 11:43 PM CSTSevere Thunderstorm WarningFWDHopkins, Hunt, Rains, Van Zandt62 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, 11.4 hours before the alert went out and 126 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 2018-11-30Temperature 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, Norman, OK at 12:00Z on 2018-11-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 242 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1498 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
242 m²/s²
0-3 km storm-relative helicity
337 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

759 
WWUS20 KWNS 302321
SEL9  
SPC WW 302321
OKZ000-TXZ000-010600-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 429
NWS Storm Prediction Center Norman OK
520 PM CST Fri Nov 30 2018

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  central and eastern Oklahoma
  parts of North Texas

* Effective this Friday afternoon from 520 PM until Midnight CST.

* Primary threats include...
  A few tornadoes possible
  Scattered large hail likely with isolated very large hail events
    to 2 inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible

SUMMARY...Strong/severe thunderstorms are forecast to continue to
develop over the next few hours, and move quickly northeastward
across Oklahoma and North Texas.  Large hail and damaging winds will
be possible with stronger storms, as well as risk for a few
tornadoes.

The tornado watch area is approximately along and 85 statute miles
east and west of a line from 20 miles west southwest of Fort Worth
TX to 35 miles north northeast of Chandler OK. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

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 500. Mean
storm motion vector 22040.

...Goss

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 30, 3:34 PM CSTMesoscale DiscussionSPCAdair, Haskell, Latimer, LeFlore, McCurtain, Pushmataha and 1 more116 min
Nov 30, 3:51 PM CSTMesoscale DiscussionSPCAtoka, Bryan, Caddo, Canadian, Carter, Cleveland and 20 more84 min

Nearby

Tornado Watches in Oklahoma, 2018Tornado Watches in Texas, 2018Every tornado watch in 2018

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.