Alert archive / Kansas / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 454

June 9, 201122 counties in Kansas; 19 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 9, 2011, 3:49 PM CDT for 22 counties in Kansas; 19 counties in Oklahoma; 9 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 9, 2011, 3:49 PM CDT (20:49 UTC)
Expired: Jun 10, 2011, 12:00 AM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 3 in
Strongest gust expected: 60 kt

All 50 counties

Allen County, KS, Butler County, KS, Chase County, KS, Chautauqua County, KS, Cowley County, KS, Elk County, KS, Greenwood County, KS, Harper County, KS, Harvey County, KS, Kingman County, KS, Labette County, KS, Marion County, KS, McPherson County, KS, Montgomery County, KS, Neosho County, KS, Reno County, KS, Rice County, KS, Saline County, KS, Sedgwick County, KS, Sumner County, KS, Wilson County, KS, Woodson County, KS, Alfalfa County, OK, Beckham County, OK, Blaine 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, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Wheeler County, TX

The radar

The Vance AFB radar (KVNX), 40 km from the middle of the area, began a volume at 20:55 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: 10%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 40%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 9, 5:17 PM CDT	Severe Thunderstorm Warning	ICT	Harvey, McPherson, Marion, Reno	58 min
Jun 9, 5:51 PM CDT	Severe Thunderstorm Warning	ICT	Harvey, Reno	54 min
Jun 9, 6:06 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	39 min
Jun 9, 6:07 PM CDT	Severe Thunderstorm Warning	ICT	Harvey, McPherson, Marion	38 min
Jun 9, 6:16 PM CDT	Severe Thunderstorm Warning	ICT	Harvey, Reno, Sedgwick	44 min
Jun 9, 6:40 PM CDT	Severe Thunderstorm Warning	ICT	Harvey, Sedgwick	65 min
Jun 9, 6:42 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	48 min
Jun 9, 6:46 PM CDT	Tornado Warning	ICT	Harvey, Sedgwick	44 min
Jun 9, 6:51 PM CDT	Severe Thunderstorm Warning	ICT	Kingman, Reno, Sedgwick	54 min
Jun 9, 6:59 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	42 min
Jun 9, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Woodward	45 min
Jun 9, 7:19 PM CDT	Tornado Warning	ICT	Butler, Sedgwick	41 min
Jun 9, 7:25 PM CDT	Severe Thunderstorm Warning	ICT	Kingman	34 min
Jun 9, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Ellis, Roger Mills	46 min
Jun 9, 7:38 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	52 min
Jun 9, 7:39 PM CDT	Severe Thunderstorm Warning	ICT	Butler, Chase, Harvey, Marion	66 min
Jun 9, 7:40 PM CDT	Severe Thunderstorm Warning	ICT	Sedgwick	50 min
Jun 9, 7:48 PM CDT	Tornado Warning	ICT	Butler, Sedgwick	42 min
Jun 9, 7:53 PM CDT	Tornado Warning	ICT	Butler, Sedgwick	37 min
Jun 9, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	31 min
Jun 9, 8:14 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Roger Mills	46 min
Jun 9, 8:21 PM CDT	Severe Thunderstorm Warning	ICT	Butler, Elk, Greenwood	54 min
Jun 9, 8:22 PM CDT	Tornado Warning	OUN	Custer, Roger Mills	23 min
Jun 9, 8:24 PM CDT	Tornado Warning	ICT	Butler, Sedgwick	31 min
Jun 9, 8:35 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	40 min
Jun 9, 8:38 PM CDT	Flash Flood Warning	ICT	Sedgwick	4 hr
Jun 9, 8:55 PM CDT	Severe Thunderstorm Warning	ICT	Butler, Sedgwick, Sumner	65 min
Jun 9, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	49 min
Jun 9, 9:08 PM CDT	Severe Thunderstorm Warning	ICT	Butler, Elk, Greenwood, Wilson, Woodson	52 min
Jun 9, 9:11 PM CDT	Severe Thunderstorm Warning	ICT	Harper, Kingman, Sumner	47 min
Jun 9, 9:15 PM CDT	Severe Thunderstorm Warning	ICT	Butler, Cowley, Elk, Sedgwick, Sumner	60 min
Jun 9, 9:29 PM CDT	Severe Thunderstorm Warning	ICT	Greenwood, Woodson	61 min
Jun 9, 9:42 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Washita	30 min
Jun 9, 10:14 PM CDT	Severe Thunderstorm Warning	ICT	Cowley, Sumner	61 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, 8.8 hours before the alert went out and 99 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: 600 J/kg
Mixed-layer CIN: -569 J/kg
Mixed-layer LCL: 1962 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 144 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
Jun 8, 8:18 PM CDT	Severe Thunderstorm Watch	SPC	Harper, Harvey, Kingman, Reno, Sedgwick, Sumner	4 hr
Jun 9, 2:13 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Brown, Butler, Chase and 35 more	92 min
Jun 9, 3:05 PM CDT	Tornado Watch	SPC	Anderson, Atchison, Brown, Clay, Coffey, Dickinson and 20 more	7 hr
Jun 9, 3:27 PM CDT	Mesoscale Discussion	SPC	Butler, Cowley, Harper, Harvey, Kingman, Reno and 2 more	2 hr

Nearby

Severe Thunderstorm Watches in Kansas, 2011 Severe Thunderstorm Watches in Oklahoma, 2011 Severe Thunderstorm Watches in Texas, 2011 Every severe thunderstorm watch in 2011

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.