Alert archive / Texas / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 199

June 22, 2018Union County, New Mexico; Beaver County, Cimarron County, Texas County, Oklahoma; 20 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 22, 2018, 2:29 PM MDT for Union County, New Mexico; Beaver County, Cimarron County, Texas County, Oklahoma; 20 counties in Texas. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: Jun 22, 2018, 2:29 PM MDT (20:29 UTC)
Expired: Jun 22, 2018, 11:00 PM MDT
In force: 9 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 65 kt

All 24 counties

Union County, NM, Beaver County, OK, Cimarron County, OK, Texas 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), 124 km from the middle of the area, began a volume at 20:32 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: 60%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 22, 3:19 PM MDT	Severe Thunderstorm Warning	AMA	Cimarron	56 min
Jun 22, 3:57 PM MDT	Tornado Warning	AMA	Cimarron	48 min
Jun 22, 4:15 PM MDT	Severe Thunderstorm Warning	AMA	Cimarron, Texas	60 min
Jun 22, 4:22 PM MDT	Severe Thunderstorm Warning	ABQ	Union	53 min
Jun 22, 4:27 PM MDT	Tornado Warning	ABQ	Union	33 min
Jun 22, 4:36 PM MDT	Severe Thunderstorm Warning	AMA	Texas	54 min
Jun 22, 4:40 PM MDT	Severe Thunderstorm Warning	AMA	Texas	65 min
Jun 22, 4:55 PM MDT	Severe Thunderstorm Warning	AMA	Carson, Dallam, Hansford, Hartley, Hutchinson, Moore and 1 more	65 min
Jun 22, 4:58 PM MDT	Severe Thunderstorm Warning	AMA	Hartley, Moore, Oldham, Potter	62 min
Jun 22, 5:29 PM MDT	Severe Thunderstorm Warning	AMA	Hansford, Sherman	20 min
Jun 22, 5:40 PM MDT	Severe Thunderstorm Warning	AMA	Beaver, Texas	65 min
Jun 22, 5:57 PM MDT	Severe Thunderstorm Warning	AMA	Hansford, Hutchinson	34 min
Jun 22, 5:58 PM MDT	Severe Thunderstorm Warning	AMA	Carson, Potter	62 min
Jun 22, 6:07 PM MDT	Severe Thunderstorm Warning	AMA	Beaver	53 min
Jun 22, 6:14 PM MDT	Tornado Warning Tornado observed	AMA	Beaver	30 min
Jun 22, 6:26 PM MDT	Severe Thunderstorm Warning	AMA	Ochiltree, Roberts	45 min
Jun 22, 6:41 PM MDT	Severe Thunderstorm Warning	AMA	Beaver	41 min
Jun 22, 6:48 PM MDT	Severe Thunderstorm Warning	AMA	Carson, Gray	57 min
Jun 22, 6:56 PM MDT	Severe Thunderstorm Warning	AMA	Hansford, Hutchinson, Moore, Sherman	64 min
Jun 22, 7:31 PM MDT	Severe Thunderstorm Warning	AMA	Carson, Hansford, Hutchinson, Ochiltree, Roberts	59 min
Jun 22, 7:41 PM MDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley, Gray, Wheeler	53 min
Jun 22, 7:54 PM MDT	Severe Thunderstorm Warning	AMA	Carson, Gray, Hutchinson, Roberts	66 min
Jun 22, 8:01 PM MDT	Tornado Warning	AMA	Donley, Gray	26 min
Jun 22, 8:19 PM MDT	Tornado Warning	AMA	Carson, Gray, Hutchinson, Roberts	26 min
Jun 22, 8:33 PM MDT	Severe Thunderstorm Warning	AMA	Carson, Donley, Gray, Hemphill, Roberts, Wheeler	42 min
Jun 22, 8:54 PM MDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley, Gray, Hemphill, Wheeler	66 min
Jun 22, 9:16 PM MDT	Tornado Warning	AMA	Wheeler	29 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 124 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: 762 J/kg
Mixed-layer CIN: -198 J/kg
Mixed-layer LCL: 1293 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 312 m²/s²
0-3 km storm-relative helicity: 409 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 22, 1:52 PM MDT	Mesoscale Discussion	SPC	Union	83 min
Jun 22, 1:06 AM MDT	Mesoscale Discussion	SPC	Beaver, Beckham, Cimarron, Ellis, Roger Mills, Texas	84 min
Jun 22, 4:14 PM MDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Blaine, Cimarron, Custer, Dewey and 9 more	2 hr
Jun 22, 5:22 PM MDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 15 more	7 hr

Nearby

Severe Thunderstorm Watches in Texas, 2018 Severe Thunderstorm Watches in Oklahoma, 2018 Severe Thunderstorm Watches in New Mexico, 2018 Every severe thunderstorm watch in 2018

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.