Alert archive / Oklahoma / Tornado Watches in 2013

Tornado Watch 171

May 18, 201338 counties in Oklahoma; 28 counties in Texas

The Storm Prediction Center issued this tornado watch at May 18, 2013, 3:17 PM CDT for 38 counties in Oklahoma; 28 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: May 18, 2013, 3:17 PM CDT (20:17 UTC)
Expired: May 18, 2013, 11:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 3 in
Strongest gust expected: 60 kt

All 66 counties

Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian 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, Harmon County, OK, Harper County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pottawatomie County, OK, Roger Mills County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Brown County, TX, Callahan County, TX, Childress County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Collingsworth County, TX, Cottle County, TX, Fisher County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Hemphill County, TX, Jones County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Nolan County, TX, Runnels County, TX, Shackelford County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 66 km from the middle of the area, began a volume at 20:19 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: 50%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 60%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 70%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 18, 4:21 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson, Kiowa	39 min
May 18, 4:49 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa	41 min
May 18, 4:59 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	46 min
May 18, 5:06 PM CDT	Severe Thunderstorm Warning	OUN	Washita	39 min
May 18, 5:25 PM CDT	Severe Thunderstorm Warning	OUN	Harper	50 min
May 18, 5:27 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	48 min
May 18, 5:29 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	46 min
May 18, 5:39 PM CDT	Severe Thunderstorm Warning	OUN	Custer	51 min
May 18, 5:44 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	46 min
May 18, 5:45 PM CDT	Severe Thunderstorm Warning	OUN	Washita	45 min
May 18, 5:59 PM CDT	Severe Thunderstorm Warning	AMA	Beaver	91 min
May 18, 5:59 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman, Washita	46 min
May 18, 6:11 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills	49 min
May 18, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Kiowa, Washita	47 min
May 18, 6:51 PM CDT	Severe Thunderstorm Warning	OUN	Harper	24 min
May 18, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Jackson	45 min
May 18, 7:27 PM CDT	Severe Thunderstorm Warning	SJT	Haskell, Throckmorton	48 min
May 18, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Greer, Kiowa, Washita	46 min
May 18, 7:40 PM CDT	Severe Thunderstorm Warning	SJT	Haskell	50 min
May 18, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	49 min
May 18, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	49 min
May 18, 8:01 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	44 min
May 18, 8:02 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	43 min
May 18, 8:12 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa, Washita	48 min
May 18, 8:22 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	38 min
May 18, 8:31 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	29 min
May 18, 8:43 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	47 min
May 18, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	45 min
May 18, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Jackson, Kiowa, Tillman	34 min
May 18, 9:02 PM CDT	Flash Flood Warning	OUN	Kiowa	3 hr
May 18, 9:05 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	40 min
May 18, 9:31 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Jackson, Kiowa, Tillman and 1 more	44 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 2:19 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 22 more	56 min
May 18, 5:52 PM CDT	Mesoscale Discussion	SPC	Blaine, Custer, Dewey, Greer, Jackson, Kiowa and 3 more	53 min

Nearby

Tornado Watches in Oklahoma, 2013 Tornado Watches in Texas, 2013 Every tornado watch in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.