Alert archive / Oklahoma / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 457

August 25, 201622 counties in Oklahoma; 20 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Aug 25, 2016, 3:27 PM CDT for 22 counties in Oklahoma; 20 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Aug 25, 2016, 3:27 PM CDT (20:27 UTC)
Expired: Aug 25, 2016, 10:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 42 counties

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, Logan County, OK, Major County, OK, Noble County, OK, Payne County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Dallam County, TX, Deaf Smith County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 68 km from the middle of the area, began a volume at 20:27 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: 2%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Aug 25, 3:39 PM CDT	Severe Thunderstorm Warning	OUN	Payne	36 min
Aug 25, 4:07 PM CDT	Severe Thunderstorm Warning	OUN	Payne	22 min
Aug 25, 4:13 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Roger Mills	47 min
Aug 25, 4:14 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth	61 min
Aug 25, 4:26 PM CDT	Tornado Warning	OUN	Beckham, Custer, Roger Mills	34 min
Aug 25, 4:53 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	67 min
Aug 25, 4:55 PM CDT	Tornado Warning	OUN	Custer, Dewey	35 min
Aug 25, 4:57 PM CDT	Tornado Warning	OUN	Custer	33 min
Aug 25, 5:03 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	42 min
Aug 25, 5:14 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey	46 min
Aug 25, 5:26 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Potter, Randall	45 min
Aug 25, 5:28 PM CDT	Severe Thunderstorm Warning	OUN	Custer	32 min
Aug 25, 5:30 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	27 min
Aug 25, 5:37 PM CDT	Severe Thunderstorm Warning	OUN	Custer	53 min
Aug 25, 5:50 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Major	40 min
Aug 25, 5:57 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	33 min
Aug 25, 5:59 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Noble, Payne	46 min
Aug 25, 6:26 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	49 min
Aug 25, 6:31 PM CDT	Severe Thunderstorm Warning	OUN	Payne	44 min
Aug 25, 6:40 PM CDT	Severe Thunderstorm Warning	OUN	Noble	35 min
Aug 25, 6:45 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	45 min
Aug 25, 7:13 PM CDT	Severe Thunderstorm Warning	OUN	Payne	9 min
Aug 25, 7:21 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	39 min
Aug 25, 8:09 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	51 min
Aug 25, 8:16 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Oldham	48 min
Aug 25, 9:01 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	44 min
Aug 25, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	74 min
Aug 25, 9:36 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	69 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 8.5 hours before the alert went out and 68 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: 165 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1170 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 24, 8:02 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Comanche, Garfield, Kay, Kingfisher and 8 more	58 min
Aug 25, 2:37 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Custer, Dewey and 10 more	113 min
Aug 25, 5:52 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Custer, Dewey, Ellis and 5 more	83 min

Nearby

Severe Thunderstorm Watches in Oklahoma, 2016 Severe Thunderstorm Watches in Texas, 2016 Every severe thunderstorm watch in 2016

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.