Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 81, NWS Amarillo, TX

May 25, 2018Hemphill County, Wheeler County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at May 25, 2018, 6:54 PM CDT for Hemphill County, Wheeler 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: May 25, 2018, 6:54 PM CDT (23:54 UTC)
Expired: May 25, 2018, 8:00 PM CDT
In force: 66 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 0.88 in
Wind: 70.0 mph

Counties Hemphill County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 137 km from the middle of the area, began a volume at 23:57 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 25, 3:43 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.9 hours before the alert went out and 137 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: 919 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 2054 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 May 25, 6:37 PM CDT, 17 minutes earlier.

Area forecast discussion, May 25, 6:37 PM CDT, 17 minutes before

Area Forecast Discussion
National Weather Service Amarillo TX
637 PM CDT Fri May 25 2018

.AVIATION...00Z TAFs...VFR conditions will prevail at all
terminals through the forecast period. Clear skies are expected,
with winds from the north AOB 10 kts becoming southeasterly BTWN
5 to 15 kts AFT 26/17Z.

Bieda

&&

.PRELIMINARY POINT TEMPS/POPS...
Amarillo TX                63  98  66  96  66 /   0   5   0  20  10
Beaver OK                  63  99  67  98  68 /   5   0   0  20  20
Boise City OK              57  96  62  94  60 /   5   0   0  30  20
Borger TX                  65  99  69  99  69 /   0   5   0  20  20
Boys Ranch TX              62  99  65  98  65 /   0   0   0  30  20
Canyon TX                  62  99  65  97  65 /   0   0   0  20  10
Clarendon TX               66  97  66  97  68 /  10   5   0  10   5
Dalhart TX                 57  97  61  95  60 /   5   0   0  30  20
Guymon OK                  60  99  65  96  65 /   0   0   0  30  20
Hereford TX                61  99  65  97  65 /   0   0   0  20  10
Lipscomb TX                64  97  68  98  69 /  10   0   0  10  20
Pampa TX                   64  95  66  95  67 /   0   0   0  20  10
Shamrock TX                66  97  68  97  70 /  20   0   0   5   5
Wellington TX              66  99  68  99  70 /  20   0   0   5   5

&&

.PREV DISCUSSION... /Issued 415 PM CDT Fri May 25 2018/

DISCUSSION...
Rapidly developing convection over southeast sections at this time
may become strong to severe through the early evening.

Otherwise, few changes to the forecast.  Very warm conditions
expected daily.  Saturday not expected to be quite as hot as
earlier thought, as southeast winds expected to prevail.  This
will position the dryline over the Panhandles Saturday afternoon,
but airmass expected to be sufficiently capped, due partly to mid-
level ridge making its way across the forecast area, no
thunderstorms are forecast.

By Sunday afternoon, increasingly  diffluent mid-level flow and
adequate instability warrants pops over mainly western 3/4 of
area.  Thunderstorms possible Sunday night across mainly northern
sections as southeast low-level jet develops.  Monday afternoon
and Monday night expected to sufficiently unstable for
thunderstorms, mainly over the eastern 2/3 of the area.  Dryline
could also support thunder in eastern sections on Tuesday.
Wednesday and Wednesday night pops offered by Blend over northern
sections seem too high and have been limited to 30 percent.

Cockrell

&&

.AMA Watches/Warnings/Advisories...
TX...None.
OK...None.

&&

7/98

Hazardous weather outlook, May 25, 3:48 PM CDT, 3 hours 6 minutes before

Hazardous Weather Outlook
National Weather Service Amarillo TX
348 PM CDT Fri May 25 2018

OKZ001>003-TXZ001>020-317-261100-
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-
348 PM CDT Fri May 25 2018

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

.DAY ONE...Through Tonight.

Isolated thunderstorms are expected across the eastern Panhandles
through early this evening. A few storms may become strong to
severe with large hail and damaging winds being the main threats.
An isolated tornado cannot be ruled out.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Elevated fire weather conditions may develop on Saturday through
Monday,and again Thursday across mainly western sections of the
Panhandles.

Thunderstorms will be possible across parts of the Panhandles
Sunday through Wednesday. Some of the storms may become strong to
severe with damaging winds and large hail as the main threats.

.SPOTTER INFORMATION STATEMENT...

Limited spotter activation may be needed early this evening.

Area fire managers and emergency officials should be alert for
elevated fire weather conditions Saturday through Monday, and
again Thursday.

Cockrell

In the hours before

Special weather statement, May 25, 3:36 PM CDT, 3 hours 18 minutes before

Special Weather Statement
National Weather Service Amarillo TX
336 PM CDT FRI MAY 25 2018

TXZ019-252100-
Donley TX-
336 PM CDT FRI MAY 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN DONLEY COUNTY UNTIL
400 PM CDT...

At 336 PM CDT, Doppler radar was tracking a strong thunderstorm over
Hedley, or 12 miles east of Clarendon, moving east at 20 mph.

Penny size hail will be possible with this storm.

Locations impacted include...
Hedley and Lelia Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

&&

LAT...LON 3484 10086 3498 10072 3495 10054 3475 10054
      3475 10085
TIME...MOT...LOC 2036Z 285DEG 16KT 3490 10067

Ward

Special weather statement, May 25, 4:01 PM CDT, 2 hours 53 minutes before

Special Weather Statement
National Weather Service Amarillo TX
401 PM CDT FRI MAY 25 2018

TXZ019-252130-
Donley TX-
401 PM CDT FRI MAY 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN DONLEY COUNTY UNTIL
430 PM CDT...

At 401 PM CDT, Doppler radar was tracking a strong thunderstorm near
Hedley, or 9 miles northwest of Memphis, moving east at 15 mph.

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

Locations impacted include...
Hedley and Lelia Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

&&

A severe thunderstorm watch remains in effect until 1100 PM CDT for
the Panhandle of Texas.

LAT...LON 3482 10075 3491 10078 3490 10054 3475 10054
      3475 10075
TIME...MOT...LOC 2101Z 273DEG 14KT 3482 10066

Ward

Special weather statement, May 25, 4:24 PM CDT, 2 hours 30 minutes before

Special Weather Statement
National Weather Service Amarillo TX
424 PM CDT FRI MAY 25 2018

TXZ020-252215-
Collingsworth TX-
424 PM CDT FRI MAY 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN COLLINGSWORTH COUNTY
UNTIL 515 PM CDT...

At 423 PM CDT, Doppler radar was tracking a strong thunderstorm 4
miles northeast of Memphis, moving east to southeast at 15 mph.

Nickel size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

This storm will remain over mainly rural areas of southwestern
Collingsworth County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

&&

A severe thunderstorm watch remains in effect until 1100 PM CDT for
the Panhandle of Texas.

LAT...LON 3487 10054 3486 10026 3475 10030 3475 10054
TIME...MOT...LOC 2123Z 278DEG 13KT 3478 10048

Ward

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 3:36 PM CDT	Special Weather Statement	AMA	Donley	24 min
May 25, 4:01 PM CDT	Special Weather Statement	AMA	Donley	29 min
May 25, 4:24 PM CDT	Special Weather Statement	AMA	Collingsworth	51 min
May 25, 6:20 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill	70 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.