Alert archive / Oklahoma / Tornado Watches in 2013

Tornado Watch 116

April 17, 201351 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 17, 2013, 1:21 PM CDT for 51 counties in Oklahoma; 8 counties in Texas. It was in force for 10 hr.

The area

The outline as issued.

The facts

Issued
Apr 17, 2013, 1:21 PM CDT (18:21 UTC)
Expired
Apr 17, 2013, 11:00 PM CDT
In force
10 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 59 counties

Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Kiowa 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, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 33 km from the middle of the area, began a volume at 18:21 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
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 17, 1:55 PM CDTSevere Thunderstorm WarningOUNGreer, Jackson, Kiowa, Washita50 min
Apr 17, 1:59 PM CDTSevere Thunderstorm WarningOUNJackson, Tillman46 min
Apr 17, 2:41 PM CDTSevere Thunderstorm WarningOUNKiowa, Washita49 min
Apr 17, 2:44 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa, Tillman46 min
Apr 17, 3:22 PM CDTSevere Thunderstorm WarningOUNCaddo, Kiowa, Washita38 min
Apr 17, 3:24 PM CDTSevere Thunderstorm WarningOUNJackson, Tillman51 min
Apr 17, 4:09 PM CDTSevere Thunderstorm WarningOUNComanche, Kiowa, Tillman51 min
Apr 17, 4:21 PM CDTSevere Thunderstorm WarningOUNJackson, Tillman54 min
Apr 17, 4:34 PM CDTTornado WarningOUNComanche, Cotton, Tillman41 min
Apr 17, 4:56 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche49 min
Apr 17, 5:02 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer, Harmon, Jackson, Kiowa, Washita43 min
Apr 17, 5:07 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa, Tillman53 min
Apr 17, 5:10 PM CDTSevere Thunderstorm WarningOUNCanadian50 min
Apr 17, 5:13 PM CDTSevere Thunderstorm WarningOUNComanche, Tillman47 min
Apr 17, 5:22 PM CDTTornado WarningOUNJackson, Kiowa, Tillman38 min
Apr 17, 5:28 PM CDTTornado WarningOUNComanche, Stephens47 min
Apr 17, 5:46 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Grady59 min
Apr 17, 5:50 PM CDTTornado WarningOUNComanche, Cotton, Tillman40 min
Apr 17, 5:52 PM CDTSevere Thunderstorm WarningOUNComanche, Kiowa, Tillman53 min
Apr 17, 5:56 PM CDTSevere Thunderstorm WarningOUNBeckham, Custer, Dewey, Roger Mills, Washita49 min
Apr 17, 5:58 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon, Jackson47 min
Apr 17, 6:07 PM CDTFlash Flood WarningOUNComanche, Kiowa, Tillman4 hr
Apr 17, 6:23 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche52 min
Apr 17, 6:24 PM CDTSevere Thunderstorm WarningOUNJackson, Tillman51 min
Apr 17, 6:45 PM CDTTornado WarningOUNComanche30 min
Apr 17, 6:49 PM CDTTornado WarningOUNCaddo, Grady26 min
Apr 17, 7:01 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa, Tillman44 min
Apr 17, 7:04 PM CDTSevere Thunderstorm WarningOUNTillman41 min
Apr 17, 7:15 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche30 min
Apr 17, 7:16 PM CDTSevere Thunderstorm WarningOUNGrady, McClain29 min
Apr 17, 7:28 PM CDTFlash Flood WarningOUNCaddo, Comanche, Grady4 hr
Apr 17, 7:39 PM CDTTornado WarningOUNCaddo, Comanche, Grady36 min
Apr 17, 7:40 PM CDTSevere Thunderstorm WarningOUNTillman50 min
Apr 17, 7:45 PM CDTSevere Thunderstorm WarningOUNCleveland, Grady, McClain30 min
Apr 17, 7:48 PM CDTSevere Thunderstorm WarningOUNComanche27 min
Apr 17, 8:09 PM CDTSevere Thunderstorm WarningOUNCleveland, Oklahoma36 min
Apr 17, 8:09 PM CDTTornado WarningOUNTillman36 min
Apr 17, 8:13 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Grady47 min
Apr 17, 8:21 PM CDTFlash Flood WarningOUNComanche, Kiowa, Tillman3 hr
Apr 17, 8:27 PM CDTSevere Thunderstorm WarningOUNGrady33 min
Apr 17, 8:30 PM CDTSevere Thunderstorm WarningOUNComanche, Cotton, Tillman45 min
Apr 17, 8:42 PM CDTTornado WarningOUNComanche, Cotton, Tillman33 min
Apr 17, 8:44 PM CDTSevere Thunderstorm WarningOUNLincoln, Oklahoma46 min
Apr 17, 8:50 PM CDTSevere Thunderstorm WarningOUNGrady, McClain25 min
Apr 17, 9:10 PM CDTTornado WarningOUNCotton50 min
Apr 17, 9:13 PM CDTSevere Thunderstorm WarningOUNCleveland, McClain, Pottawatomie47 min
Apr 17, 9:15 PM CDTSevere Thunderstorm WarningOUNGarvin, Grady, McClain45 min
Apr 17, 9:49 PM CDTSevere Thunderstorm WarningOUNLincoln, Pottawatomie, Seminole26 min
Apr 17, 9:58 PM CDTSevere Thunderstorm WarningOUNCotton, Stephens47 min
Apr 17, 10:05 PM CDTSevere Thunderstorm WarningOUNCleveland, McClain, Pottawatomie55 min
Apr 17, 10:09 PM CDTSevere Thunderstorm WarningTSACreek, Okfuskee, Okmulgee, Tulsa51 min
Apr 17, 10:18 PM CDTSevere Thunderstorm WarningOUNLincoln, Pottawatomie12 min
Apr 17, 10:35 PM CDTSevere Thunderstorm WarningTSACreek, Osage, Pawnee, Rogers, Tulsa, Washington55 min
Apr 17, 10:38 PM CDTSevere Thunderstorm WarningOUNGarvin, Grady, McClain, Stephens52 min
Apr 17, 11:00 PM CDTSevere Thunderstorm WarningTSACreek, Okfuskee, Okmulgee, Tulsa60 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, 6.4 hours before the alert went out and 45 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 2013-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1182 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 2013-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 407 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
1182 J/kg
Mixed-layer CIN
-193 J/kg
Mixed-layer LCL
662 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
407 m²/s²
0-3 km storm-relative helicity
433 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
Apr 17, 12:41 AM CDTMesoscale DiscussionSPCAlfalfa, Grant, Harper, Woods, Woodward94 min
Apr 17, 9:50 AM CDTMesoscale DiscussionSPCCraig, Nowata, Ottawa, Washington55 min
Apr 17, 1:09 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 39 more96 min
Apr 17, 5:23 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Carter, Cherokee, Cleveland, Coal and 37 more97 min
Apr 17, 6:30 PM CDTMesoscale DiscussionSPCCleveland, Comanche, Grady, McClain90 min
Apr 17, 2:30 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Comanche, Concho and 27 more90 min
Apr 17, 6:48 PM CDTMesoscale DiscussionSPCCallahan, Eastland, Jones, Shackelford, Stephens, Taylor and 2 more87 min

Nearby

Tornado Watches in Oklahoma, 2013Tornado Watches in Texas, 2013Every tornado watch in 2013

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.