Alert archive / Texas / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 174

June 12, 201812 counties in Oklahoma; 28 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 12, 2018, 4:40 PM CDT for 12 counties in Oklahoma; 28 counties in Texas. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
Jun 12, 2018, 4:40 PM CDT (21:40 UTC)
Expired
Jun 13, 2018, 2:00 AM CDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 40 counties

Beaver County, OK, Beckham County, OK, Cimarron County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Roger Mills County, OK, Texas County, OK, Woods County, OK, Woodward County, OK, Armstrong County, TX, Briscoe County, TX, Carson County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Dallam County, TX, Donley County, TX, Floyd County, TX, Foard County, TX, Gray County, TX, Hall County, TX, Hansford County, TX, Hardeman County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Motley County, TX, Ochiltree County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Swisher County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 134 km from the middle of the area, began a volume at 21:44 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
60%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 12, 5:01 PM CDTSevere Thunderstorm WarningOUNHarper, Woods44 min
Jun 12, 5:06 PM CDTSevere Thunderstorm WarningAMAArmstrong, Carson, Donley, Gray54 min
Jun 12, 5:14 PM CDTSevere Thunderstorm WarningAMAGray, Hutchinson, Ochiltree, Roberts61 min
Jun 12, 5:43 PM CDTSevere Thunderstorm WarningOUNHarper62 min
Jun 12, 5:59 PM CDTSevere Thunderstorm WarningAMACarson, Gray61 min
Jun 12, 6:14 PM CDTSevere Thunderstorm WarningAMACarson, Gray, Hutchinson, Roberts76 min
Jun 12, 6:26 PM CDTFlash Flood WarningAMACarson3 hr
Jun 12, 6:29 PM CDTSevere Thunderstorm WarningOUNHarper61 min
Jun 12, 6:59 PM CDTSevere Thunderstorm WarningAMAArmstrong, Carson76 min
Jun 12, 7:09 PM CDTSevere Thunderstorm WarningAMABeaver81 min
Jun 12, 7:15 PM CDTSevere Thunderstorm WarningOUNHarper60 min
Jun 12, 7:15 PM CDTSevere Thunderstorm WarningAMAHutchinson, Moore60 min
Jun 12, 7:34 PM CDTFlash Flood WarningOUNHarper3 hr
Jun 12, 7:44 PM CDTSevere Thunderstorm WarningAMABeaver, Texas61 min
Jun 12, 8:06 PM CDTFlash Flood WarningAMABeaver3 hr
Jun 12, 8:06 PM CDTSevere Thunderstorm WarningAMAArmstrong, Carson51 min
Jun 12, 8:29 PM CDTSevere Thunderstorm WarningAMABeaver76 min
Jun 12, 8:31 PM CDTSevere Thunderstorm WarningAMAHartley, Moore, Oldham, Potter74 min
Jun 12, 8:44 PM CDTSevere Thunderstorm WarningAMABeaver61 min
Jun 12, 8:48 PM CDTSevere Thunderstorm WarningAMACimarron, Texas72 min
Jun 12, 9:41 PM CDTSevere Thunderstorm WarningAMABeaver44 min
Jun 12, 9:44 PM CDTSevere Thunderstorm WarningAMACarson, Hartley, Moore, Oldham, Potter, Randall46 min
Jun 12, 9:49 PM CDTSevere Thunderstorm WarningAMACimarron, Texas71 min
Jun 12, 10:01 PM CDTFlash Flood WarningAMAHartley, Moore, Oldham, Potter107 min
Jun 12, 10:38 PM CDTSevere Thunderstorm WarningAMAArmstrong, Donley49 min
Jun 12, 10:49 PM CDTSevere Thunderstorm WarningAMABeaver, Texas86 min
Jun 12, 10:54 PM CDTSevere Thunderstorm WarningAMAHartley, Moore, Oldham, Potter73 min
Jun 12, 11:11 PM CDTSevere Thunderstorm WarningAMAHemphill, Lipscomb79 min
Jun 12, 11:53 PM CDTSevere Thunderstorm WarningAMAArmstrong, Carson, Potter, Randall67 min
Jun 13, 12:22 AM CDTSevere Thunderstorm WarningAMAArmstrong, Deaf Smith, Randall98 min
Jun 13, 12:27 AM CDTSevere Thunderstorm WarningAMAGray, Hemphill, Roberts, Wheeler71 min
Jun 13, 1:01 AM CDTSevere Thunderstorm WarningLUBBriscoe, Swisher59 min
Jun 13, 1:06 AM CDTSevere Thunderstorm WarningAMADallam, Hartley, Moore, Sherman34 min
Jun 13, 1:23 AM CDTSevere Thunderstorm WarningLUBBriscoe, Swisher67 min
Jun 13, 1:54 AM CDTSevere Thunderstorm WarningOUNBeckham, Custer, Roger Mills, Washita66 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, 9.7 hours before the alert went out and 133 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-pSkew-T log-p diagram, Amarillo Airport, TX at 12:00Z on 2018-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1158 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 12:00Z on 2018-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1158 J/kg
Mixed-layer CIN
-341 J/kg
Mixed-layer LCL
1976 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
54 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.

IssuedProductOfficeCountiesLasted
Jun 12, 12:33 AM CDTMesoscale DiscussionSPCAlfalfa, Craig, Garfield, Grant, Kay, Kingfisher and 9 more117 min
Jun 12, 3:17 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Cimarron, Ellis, Harper, Roger Mills and 1 more118 min
Jun 12, 6:47 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Ellis, Harper, Roger Mills, Woodward88 min

Nearby

Severe Thunderstorm Watches in Texas, 2018Severe Thunderstorm Watches in Oklahoma, 2018Every 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.