Alert archive / Oklahoma / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 325

May 30, 201243 counties in Oklahoma; 11 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 30, 2012, 6:13 PM CDT for 43 counties in Oklahoma; 11 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
May 30, 2012, 6:13 PM CDT (23:13 UTC)
Expired
May 31, 2012, 2:00 AM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
65 kt
All 54 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harper 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, Major County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Cooke County, TX, Denton County, TX, Jack County, TX, Montague County, TX, Parker County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX

The radar

The Altus AFB radar (KFDR), 132 km from the middle of the area, began a volume at 23:14 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
20%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 30, 6:26 PM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Canadian, Custer, Grady, Washita64 min
May 30, 7:09 PM CDTSevere Thunderstorm WarningOUNBlaine, Canadian, Kingfisher15 min
May 30, 7:11 PM CDTSevere Thunderstorm WarningOUNCotton49 min
May 30, 7:29 PM CDTTornado WarningOUNBaylor, Knox31 min
May 30, 7:31 PM CDTSevere Thunderstorm WarningOUNCanadian, Grady29 min
May 30, 7:33 PM CDTSevere Thunderstorm WarningOUNCotton, Jefferson, Stephens57 min
May 30, 7:55 PM CDTSevere Thunderstorm WarningOUNBaylor, Knox65 min
May 30, 8:53 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Ellis, Garfield, Grant, Harper, Kay and 3 more52 min
May 30, 8:53 PM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Love, Stephens52 min
May 30, 8:59 PM CDTSevere Thunderstorm WarningOUNArcher, Baylor61 min
May 30, 9:44 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Dewey, Ellis, Garfield, Grant, Harper and 7 more61 min
May 30, 9:54 PM CDTSevere Thunderstorm WarningFWDJack66 min
May 30, 10:08 PM CDTSevere Thunderstorm WarningFWDJack, Palo Pinto, Young52 min
May 30, 10:32 PM CDTSevere Thunderstorm WarningOUNBlaine, Custer, Dewey, Garfield, Grant, Kay and 6 more58 min
May 30, 11:02 PM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Canadian, Cleveland, Custer, Grady and 8 more43 min
May 30, 11:48 PM CDTSevere Thunderstorm WarningOUNCanadian, Cleveland, Garvin, Grady, Lincoln, Logan and 5 more42 min
May 30, 11:56 PM CDTSevere Thunderstorm WarningFWDDenton28 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, 11.2 hours before the alert went out and 128 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 2012-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 52 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 2012-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
52 J/kg
Mixed-layer CIN
-388 J/kg
Mixed-layer LCL
1888 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
132 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 29, 7:33 PM CDTSevere Thunderstorm WatchSPCChoctaw, Creek, Haskell, Latimer, LeFlore, McIntosh and 11 more5 hr
May 29, 8:21 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 32 more54 min
May 29, 9:10 PM CDTMesoscale DiscussionSPCAtoka, Canadian, Carter, Cleveland, Coal, Garvin and 10 more95 min
May 29, 11:28 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Cleveland, Coal and 17 more62 min
May 30, 12:43 AM CDTSevere Thunderstorm WatchSPCMcCurtain7 hr
May 30, 2:43 AM CDTMesoscale DiscussionSPCCotton, Tillman92 min
May 30, 3:38 PM CDTTornado WatchSPCBeaver, Harmon5 hr
May 30, 5:47 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Comanche, Custer, Dewey, Ellis and 10 more88 min
May 29, 8:54 PM CDTMesoscale DiscussionSPCCollin, Dallas, Denton, Hood, Jack, Johnson and 6 more96 min
May 30, 5:07 AM CDTMesoscale DiscussionSPCAnderson, Camp, Cherokee, Collin, Dallas, Denton and 28 more83 min
May 30, 2:58 PM CDTMesoscale DiscussionSPCBriscoe, Childress, Collingsworth, Cottle, Dickens, Donley and 8 more62 min
May 30, 4:52 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Concho, Eastland and 17 more83 min
May 30, 5:11 PM CDTTornado WatchSPCBrown, Burnet, Callahan, Coke, Coleman, Comanche and 27 more6 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2012Severe Thunderstorm Watches in Texas, 2012Every severe thunderstorm watch in 2012

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.