Alert archive / Oklahoma / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 91

May 14, 201822 counties in Oklahoma; 10 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 14, 2018, 4:39 PM CDT for 22 counties in Oklahoma; 10 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 14, 2018, 4:39 PM CDT (21:39 UTC)
Expired
May 14, 2018, 11:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 32 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Noble County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Briscoe County, TX, Childress County, TX, Cottle County, TX, Foard County, TX, Hall County, TX, Hardeman County, TX, King County, TX, Knox County, TX, Motley County, TX, Wilbarger County, TX

The radar

The Vance AFB radar (KVNX), 133 km from the middle of the area, began a volume at 21:38 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
5%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
60%
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
30%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 14, 5:08 PM CDTSevere Thunderstorm WarningLUBDickens, Kent, King, Motley, Stonewall67 min
May 14, 5:30 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer, Harmon45 min
May 14, 5:37 PM CDTSevere Thunderstorm WarningLUBChildress23 min
May 14, 5:42 PM CDTSevere Thunderstorm WarningLUBMotley33 min
May 14, 5:57 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon48 min
May 14, 6:05 PM CDTSevere Thunderstorm WarningOUNBeckham, Roger Mills55 min
May 14, 6:06 PM CDTSevere Thunderstorm WarningLUBChildress, Hall, Motley54 min
May 14, 6:09 PM CDTSevere Thunderstorm WarningOUNDewey, Ellis, Woodward51 min
May 14, 6:14 PM CDTSevere Thunderstorm WarningOUNBeckham46 min
May 14, 6:42 PM CDTSevere Thunderstorm WarningOUNMajor, Woodward48 min
May 14, 6:46 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer, Harmon, Jackson44 min
May 14, 6:53 PM CDTSevere Thunderstorm WarningLUBChildress37 min
May 14, 6:56 PM CDTSevere Thunderstorm WarningOUNKay64 min
May 14, 7:18 PM CDTSevere Thunderstorm WarningOUNBeckham42 min
May 14, 7:19 PM CDTSevere Thunderstorm WarningOUNMajor, Woods, Woodward41 min
May 14, 7:39 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon36 min
May 14, 7:47 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods58 min
May 14, 7:53 PM CDTSevere Thunderstorm WarningOUNBeckham, Custer, Washita37 min
May 14, 7:58 PM CDTSevere Thunderstorm WarningOUNKay47 min
May 14, 8:04 PM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Custer, Washita41 min
May 14, 8:16 PM CDTSevere Thunderstorm WarningOUNGrant59 min
May 14, 8:40 PM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Canadian, Grady50 min
May 14, 8:44 PM CDTSevere Thunderstorm WarningOUNKay31 min
May 14, 9:20 PM CDTSevere Thunderstorm WarningOUNGrant, Kay70 min
May 14, 9:25 PM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Grady35 min
May 14, 10:25 PM CDTSevere Thunderstorm WarningOUNKay25 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 9.7 hours before the alert went out and 273 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, Amarillo Airport, TX at 12:00Z on 2018-05-14Temperature 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, Amarillo Airport, TX at 12:00Z on 2018-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 128 square meters per square second.193958Sfc1 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
3144 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
128 m²/s²
0-3 km storm-relative helicity
104 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
May 13, 7:14 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Custer, Dewey, Ellis, Greer and 6 more91 min
May 14, 3:10 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Custer, Dewey, Garfield and 10 more2 hr
May 14, 2:32 PM CDTMesoscale DiscussionSPCBaylor, Coke, Cottle, Crockett, Dickens, Fisher and 21 more88 min

Nearby

Severe Thunderstorm Watches in Oklahoma, 2018Severe Thunderstorm Watches in Texas, 2018Every severe thunderstorm 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.