Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 242, NWS Amarillo, TX

August 16, 2018Gray County, Wheeler County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Aug 16, 2018, 7:18 PM CDT for Gray County, Wheeler County, Texas. It was in force for 42 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
Aug 16, 2018, 7:18 PM CDT (00:18 UTC)
Expired
Aug 16, 2018, 8:00 PM CDT
In force
42 min
Issued by
NWS Amarillo, TX
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Gray County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 108 km from the middle of the area, began a volume at 00:18 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 00:00Z, 0.3 hours before the alert went out and 107 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 00:00Z on 2018-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1376 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 00:00Z on 2018-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 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
1376 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
2307 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

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 Aug 16, 3:07 PM CDT, 4 hours 11 minutes earlier.

Area forecast discussion, Aug 16, 3:07 PM CDT, 4 hours 11 minutes before
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Hazardous weather outlook, Aug 16, 3:10 PM CDT, 4 hours 8 minutes before
Hazardous Weather Outlook
National Weather Service Amarillo TX
310 PM CDT Thu Aug 16 2018

OKZ001>003-TXZ001>020-317-171200-
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-
310 PM CDT Thu Aug 16 2018

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

.DAY ONE...This Afternoon and Tonight.

A few thunderstorms are possible this afternoon and evening. A
strong storm or two will be possible, but widespread severe
weather is not expected.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Thunderstorms will be possible across much of the Oklahoma and
Texas Panhandles Friday through Tuesday night, except for Sunday
night through Monday night which are expected to be dry. A few
storms may become strong to marginally severe, with damaging
winds and hail the primary hazards. In addition, heavy rainfall
may accompany the strongest storms, which could lead to localized
flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

In the hours before

Special weather statement, Aug 16, 6:42 PM CDT, 36 minutes before
Special Weather Statement
National Weather Service Amarillo TX
642 PM CDT THU AUG 16 2018

OKZ001-170015-
Cimarron OK-
642 PM CDT THU AUG 16 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CIMARRON COUNTY
UNTIL 715 PM CDT...

At 641 PM CDT, Doppler radar was tracking a strong thunderstorm over
Felt, or 20 miles southwest of Boise City. This storm was nearly
stationary.

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

Locations impacted include...
Felt and Wheeless.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3675 10300 3676 10265 3651 10261 3650 10300
TIME...MOT...LOC 2341Z 150DEG 2KT 3655 10281

MJG
Special weather statement, Aug 16, 7:07 PM CDT, 11 minutes before
Special Weather Statement
National Weather Service Amarillo TX
707 PM CDT THU AUG 16 2018

TXZ014-015-170030-
Gray TX-Wheeler TX-
707 PM CDT THU AUG 16 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WHEELER AND
NORTHEASTERN GRAY COUNTIES UNTIL 730 PM CDT...

At 707 PM CDT, Doppler radar was tracking a strong thunderstorm 10
miles west of New Mobeetie, or 12 miles south of Miami, moving
northeast at 5 mph.

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

Locations impacted include...
New Mobeetie and Mobeetie.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3542 10064 3556 10072 3562 10057 3562 10041
      3546 10038
TIME...MOT...LOC 0007Z 241DEG 6KT 3552 10062

MJG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 7:07 PM CDTSpecial Weather StatementAMAGray23 min
Aug 16, 8:18 PM CDTSpecial Weather StatementAMAMoore27 min
Aug 16, 8:44 PM CDTSpecial Weather StatementAMACarson31 min
Aug 16, 9:05 PM CDTSevere Thunderstorm WarningAMACarson, Gray40 min
Aug 16, 9:35 PM CDTSpecial Weather StatementAMADonley25 min
Aug 16, 10:21 PM CDTSpecial Weather StatementAMAPotter24 min
Aug 16, 10:41 PM CDTSevere Thunderstorm WarningAMAPotter47 min
Aug 16, 11:07 PM CDTSevere Thunderstorm WarningAMAPotter21 min
Aug 17, 2:30 PM CDTSevere Thunderstorm WarningAMAHutchinson60 min
Aug 17, 3:23 PM CDTSevere Thunderstorm WarningAMAHutchinson67 min
Aug 17, 3:31 PM CDTSevere Thunderstorm WarningAMAMoore, Sherman59 min
Aug 17, 3:44 PM CDTFlash Flood WarningAMAHutchinson76 min
Aug 17, 3:46 PM CDTSpecial Weather StatementAMADallam29 min
Aug 17, 3:58 PM CDTAreal Flood AdvisoryAMAHansford, Hutchinson, Moore, Sherman3 hr
Aug 17, 4:01 PM CDTSpecial Weather StatementAMAGray29 min
Aug 17, 4:33 PM CDTSpecial Weather StatementAMASherman27 min
Aug 17, 4:41 PM CDTSevere Thunderstorm WarningAMAGray64 min
Aug 17, 5:41 PM CDTSevere Thunderstorm WarningAMADallam, Hartley35 min
Aug 17, 4:56 PM CDTSpecial Weather StatementAMACimarron34 min

Nearby

Severe Thunderstorm Warnings in Texas, 2018Every 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.