Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 137, NWS Amarillo, TX

June 12, 2018Hemphill County, Roberts County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jun 12, 2018, 4:09 PM CDT for Hemphill County, Roberts County, Texas. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 12, 2018, 4:09 PM CDT (21:09 UTC)
Expired: Jun 12, 2018, 5:15 PM CDT
In force: 66 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hemphill County, TX, Roberts County, TX

The radar

The Amarillo radar (KAMA), 125 km from the middle of the area, began a volume at 21:12 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.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 9.2 hours before the alert went out and 125 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: 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

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Amarillo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 12, 2:47 PM CDT, 1 hour 22 minutes earlier.

Area forecast discussion, Jun 12, 2:47 PM CDT, 1 hour 22 minutes before

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Hazardous weather outlook, Jun 12, 3:54 PM CDT, 15 minutes before

Hazardous Weather Outlook
National Weather Service Amarillo TX
354 PM CDT Tue Jun 12 2018

OKZ001>003-TXZ001>020-317-131200-
Cimarron-Texas-Beaver-Dallam-Sherman-Hansford-Ochiltree-Lipscomb-
Hartley-Moore-Hutchinson-Roberts-Hemphill-Oldham-Potter-Carson-
Gray-Wheeler-Deaf Smith-Randall-Armstrong-Donley-Collingsworth-
Palo Duro Canyon-
354 PM CDT Tue Jun 12 2018

This Hazardous Weather Outlook is for the Texas and Oklahoma
Panhandles.

.DAY ONE...Tonight.

Thunderstorms are possible across the Panhandles. Some of the
storms may become severe with large hail and damaging winds the
main threats.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Thunderstorms will be possible across the Panhandles Wednesday
and again Sunday and Monday. Some of the storms may become severe.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed through tonight.

In the hours before

Special weather statement, Jun 12, 3:36 PM CDT, 33 minutes before

Special Weather Statement
National Weather Service Amarillo TX
336 PM CDT TUE JUN 12 2018

TXZ009-010-014-015-122115-
Hemphill TX-Gray TX-Wheeler TX-Roberts TX-
336 PM CDT TUE JUN 12 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WHEELER...NORTHERN
GRAY...SOUTHEASTERN ROBERTS AND SOUTHWESTERN HEMPHILL COUNTIES UNTIL
415 PM CDT...

At 336 PM CDT, Doppler radar was tracking a strong thunderstorm over
Miami, moving northeast at 10 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Pampa, Miami, Codman and Lora.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

&&

LAT...LON 3540 10097 3555 10109 3561 10108 3595 10054
      3564 10029
TIME...MOT...LOC 2036Z 231DEG 8KT 3570 10063

Guerrero

Local storm report, Jun 12, 4:01 PM CDT, 8 minutes before

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Local storm report, Jun 12, 4:09 PM CDT, 0 minutes before

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The office that day

Everything else NWS Amarillo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 12, 3:36 PM CDT	Special Weather Statement	AMA	Roberts	39 min
Jun 12, 5:06 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Donley, Gray	54 min
Jun 12, 5:14 PM CDT	Severe Thunderstorm Warning	AMA	Gray, Hutchinson, Ochiltree, Roberts	61 min
Jun 12, 5:59 PM CDT	Severe Thunderstorm Warning	AMA	Carson, Gray	61 min
Jun 12, 6:14 PM CDT	Severe Thunderstorm Warning	AMA	Carson, Gray, Hutchinson, Roberts	76 min
Jun 12, 6:26 PM CDT	Flash Flood Warning	AMA	Carson	3 hr
Jun 12, 6:40 PM CDT	Areal Flood Advisory	AMA	Carson, Gray, Hutchinson, Moore, Roberts	3 hr
Jun 12, 6:59 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson	76 min
Jun 12, 6:49 PM CDT	Special Weather Statement	AMA	Beaver	26 min

Nearby

Severe Thunderstorm Warnings in Texas, 2018 Every severe thunderstorm warning 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.