Alert archive / Oklahoma / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 425

June 19, 200728 counties in Oklahoma; 18 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 19, 2007, 11:20 PM CDT for 28 counties in Oklahoma; 18 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 19, 2007, 11:20 PM CDT (04:20 UTC)
Expired: Jun 20, 2007, 5:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 46 counties

Atoka County, OK, Beckham County, OK, Bryan County, OK, Caddo County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Clay County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Floyd County, TX, Foard County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Motley County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 51 km from the middle of the area, began a volume at 04:20 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: 40%
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: 5%
Six or more combined severe hail and wind reports: 60%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 20, 12:04 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Jackson	41 min
Jun 20, 12:08 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma, Pottawatomie	52 min
Jun 20, 12:20 AM CDT	Severe Thunderstorm Warning	LUB	Childress	55 min
Jun 20, 12:23 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Grady, Stephens, Tillman	52 min
Jun 20, 12:26 AM CDT	Severe Thunderstorm Warning	LUB	Lubbock	64 min
Jun 20, 12:40 AM CDT	Severe Thunderstorm Warning	LUB	Cottle	65 min
Jun 20, 12:45 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	45 min
Jun 20, 1:03 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain	27 min
Jun 20, 1:05 AM CDT	Severe Thunderstorm Warning	OUN	Kiowa	25 min
Jun 20, 1:11 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	49 min
Jun 20, 1:16 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	59 min
Jun 20, 1:28 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa	47 min
Jun 20, 2:01 AM CDT	Severe Thunderstorm Warning	OUN	Jefferson	59 min
Jun 20, 2:09 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	51 min
Jun 20, 2:15 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	45 min
Jun 20, 2:26 AM CDT	Severe Thunderstorm Warning	OUN	Grady, Stephens	32 min
Jun 20, 2:59 AM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	31 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 00:00Z, 4.3 hours before the alert went out and 200 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: 4566 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1071 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 7:39 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 39 more	66 min
Jun 19, 9:28 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 32 more	62 min
Jun 20, 12:49 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Cotton, Garvin and 6 more	56 min
Jun 20, 4:09 AM CDT	Mesoscale Discussion	SPC	Bryan, Choctaw, Love, Marshall	96 min
Jun 20, 4:38 AM CDT	Severe Thunderstorm Watch	SPC	Choctaw	6 hr
Jun 20, 10:21 AM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Haskell, Latimer, LeFlore, McCurtain and 4 more	54 min
Jun 20, 1:10 AM CDT	Severe Thunderstorm Watch	SPC	Borden, Bosque, Brown, Callahan, Coke, Coleman and 47 more	8 hr
Jun 20, 3:44 AM CDT	Mesoscale Discussion	SPC	Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 65 more	91 min
Jun 20, 6:24 AM CDT	Mesoscale Discussion	SPC	Edwards, Kinney, Real, Sutton, Terrell, Val Verde	66 min
Jun 20, 6:42 AM CDT	Mesoscale Discussion	SPC	Bastrop, Bell, Caldwell, Falls, Hays, Lee and 4 more	93 min
Jun 20, 2:39 PM CDT	Mesoscale Discussion	SPC	El Paso, Hudspeth	96 min

Nearby

Severe Thunderstorm Watches in Oklahoma, 2007 Severe Thunderstorm Watches in Texas, 2007 Every severe thunderstorm watch in 2007

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.