Alert archive / Oklahoma / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 317

May 29, 20126 counties in Kansas; 44 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at May 29, 2012, 3:55 PM CDT for 6 counties in Kansas; 44 counties in Oklahoma. It was in force for 12 hr.

The area

The outline as issued.

The facts

Issued: May 29, 2012, 3:55 PM CDT (20:55 UTC)
Expired: May 30, 2012, 4:00 AM CDT
In force: 12 hr
Issued by: the Storm Prediction Center
Largest hail expected: 3 in
Strongest gust expected: 70 kt

All 50 counties

Barber County, KS, Clark County, KS, Comanche County, KS, Harper County, KS, Meade County, KS, Sumner County, KS, Alfalfa County, OK, Atoka County, OK, Blaine County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal 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, Harper 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, 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, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 78 km from the middle of the area, began a volume at 20:59 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: 70%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 70%
One or more hailstones of 2 inches or more: 40%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 29, 4:37 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	53 min
May 29, 4:41 PM CDT	Severe Thunderstorm Warning	DDC	Clark, Meade	64 min
May 29, 4:49 PM CDT	Severe Thunderstorm Warning	DDC	Clark, Meade	56 min
May 29, 5:12 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Tillman	63 min
May 29, 5:21 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	54 min
May 29, 5:26 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	64 min
May 29, 5:28 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Grant, Kingfisher, Major	62 min
May 29, 5:30 PM CDT	Severe Thunderstorm Warning	DDC	Clark	41 min
May 29, 5:40 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	65 min
May 29, 5:47 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	43 min
May 29, 5:54 PM CDT	Severe Thunderstorm Warning	DDC	Clark	35 min
May 29, 6:06 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	54 min
May 29, 6:07 PM CDT	Severe Thunderstorm Warning	ICT	Harper	38 min
May 29, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Kiowa, Tillman	66 min
May 29, 6:26 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Grant, Kingfisher, Logan and 1 more	64 min
May 29, 6:39 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	55 min
May 29, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	47 min
May 29, 6:51 PM CDT	Severe Thunderstorm Warning	OUN	Grant	54 min
May 29, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	60 min
May 29, 7:05 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	25 min
May 29, 7:14 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	40 min
May 29, 7:20 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Noble, Payne	40 min
May 29, 7:21 PM CDT	Severe Thunderstorm Warning	ICT	Sumner	24 min
May 29, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Garfield, Kingfisher, Logan, Major and 1 more	63 min
May 29, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	63 min
May 29, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Kay, Noble, Woods	25 min
May 29, 8:05 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Kingfisher, Lincoln, Logan, McClain and 1 more	55 min
May 29, 8:26 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Garfield, Kingfisher, Logan, Major and 1 more	64 min
May 29, 8:27 PM CDT	Tornado Warning	OUN	Canadian, Oklahoma	33 min
May 29, 8:50 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Cleveland, Grady, Kingfisher, Lincoln and 4 more	40 min
May 29, 9:27 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Cleveland, Grady, Kingfisher and 2 more	63 min
May 29, 9:44 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pottawatomie, Seminole	61 min
May 29, 10:16 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, Grady, McClain, Oklahoma	59 min
May 29, 10:29 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Cleveland, Grady, Kingfisher	61 min
May 29, 10:42 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	33 min
May 29, 10:56 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Murray, Pontotoc, Pottawatomie and 1 more	47 min
May 29, 10:58 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Garvin, Grady, Stephens	47 min
May 29, 11:29 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	31 min
May 29, 11:32 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston, Murray, Pontotoc	58 min
May 29, 11:46 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Comanche, Garvin, Grady, Jefferson, Murray and 1 more	44 min
May 30, 12:28 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Comanche, Cotton, Grady, Jefferson, Love and 1 more	62 min
May 30, 12:41 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Marshall	64 min
May 30, 1:26 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Love, Marshall	64 min
May 30, 1:35 AM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	40 min
May 30, 2:23 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love, Stephens	67 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

Lamont, OK (KLMN), launched 12:00Z, 8.9 hours before the alert went out and 116 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 240 J/kg
Mixed-layer CIN: -321 J/kg
Mixed-layer LCL: 1592 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 48 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.

Issued	Product	Office	Counties	Lasted
May 28, 11:06 PM CDT	Mesoscale Discussion	SPC	Cherokee, Crawford, Labette, Montgomery	54 min
May 29, 3:06 PM CDT	Mesoscale Discussion	SPC	Barber, Clark, Comanche, Meade, Seward	84 min
May 29, 6:47 PM CDT	Mesoscale Discussion	SPC	Barber, Clark, Comanche, Harper, Sumner	88 min
May 28, 7:44 PM CDT	Mesoscale Discussion	SPC	Bryan, Carter, Coal, Garvin, Hughes, Johnston and 7 more	91 min
May 28, 9:51 PM CDT	Mesoscale Discussion	SPC	Canadian, Creek, Kingfisher, Lincoln, Logan, Oklahoma and 2 more	54 min

Nearby

Severe Thunderstorm Watches in Oklahoma, 2012 Severe Thunderstorm Watches in Kansas, 2012 Every 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.