Alert archive / Texas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 281, NWS Amarillo, TX

September 17, 2017Hartley County, Oldham County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Sep 17, 2017, 5:46 PM CDT for Hartley County, Oldham County, Texas. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 17, 2017, 5:46 PM CDT (22:46 UTC)
Expired: Sep 17, 2017, 6:45 PM CDT
In force: 59 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 2.0 in
Wind: 70.0 mph

Counties Hartley County, TX, Oldham County, TX

The radar

The Amarillo radar (KAMA), 80 km from the middle of the area, began a volume at 22:47 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Sep 17, 3:41 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.8 hours before the alert went out and 81 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: 240 J/kg
Mixed-layer CIN: -249 J/kg
Mixed-layer LCL: 1391 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

988 
WUUS54 KAMA 172246
SVRAMA
TXC205-359-172345-
/O.NEW.KAMA.SV.W.0281.170917T2246Z-170917T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
546 PM CDT SUN SEP 17 2017

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Northeastern Oldham County in the Panhandle of Texas...
  Southeastern Hartley County in the Panhandle of Texas...

* Until 645 PM CDT

* At 545 PM CDT, a severe thunderstorm was located 16 miles north of
  Adrian, or 18 miles northwest of Vega, moving north at 35 mph.

  HAZARD...Two inch hail and 70 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect some tree damage. Damage is likely to mobile 
           homes, roofs, and outbuildings. People and animals 
           outdoors will be injured. Expect hail damage to roofs, 
           siding, windows, and vehicles. 

* Locations impacted include...
  Channing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3541 10233 3552 10274 3588 10265 3578 10231
TIME...MOT...LOC 2245Z 200DEG 30KT 3550 10256 

HAIL...2.00IN
WIND...70MPH
 
$$

DGW

4 follow-up statements

853 
WWUS54 KAMA 172258
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
558 PM CDT SUN SEP 17 2017

TXC205-359-172345-
/O.CON.KAMA.SV.W.0281.000000T0000Z-170917T2345Z/
Oldham TX-Hartley TX-
558 PM CDT SUN SEP 17 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHEASTERN OLDHAM AND SOUTHEASTERN HARTLEY COUNTIES...

At 558 PM CDT, a severe thunderstorm was located 11 miles southwest
of Channing, or 25 miles north of Vega, moving north at 35 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Minor damage to roofs, siding, and trees is possible. 
         People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. 

Locations impacted include...
Channing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3550 10267 3586 10263 3578 10231 3541 10233
TIME...MOT...LOC 2258Z 200DEG 30KT 3561 10251 

HAIL...1.75IN
WIND...60MPH
 
$$

DGW

135 
WWUS54 KAMA 172314
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
614 PM CDT SUN SEP 17 2017

TXC205-359-172345-
/O.CON.KAMA.SV.W.0281.000000T0000Z-170917T2345Z/
Oldham TX-Hartley TX-
614 PM CDT SUN SEP 17 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHEASTERN OLDHAM AND SOUTHEASTERN HARTLEY COUNTIES...

At 613 PM CDT, a severe thunderstorm was located 7 miles northwest of
Channing, or 22 miles south of Dalhart, moving north at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Minor damage to roofs, siding, and trees is possible. Hail 
         damage to vehicles is expected. 

Locations impacted include...
Channing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3559 10250 3570 10257 3584 10255 3578 10231
      3550 10233
TIME...MOT...LOC 2313Z 200DEG 30KT 3574 10245 

HAIL...1.00IN
WIND...60MPH
 
$$

DGW

844 
WWUS54 KAMA 172330
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
630 PM CDT SUN SEP 17 2017

TXC359-172340-
/O.CAN.KAMA.SV.W.0281.000000T0000Z-170917T2345Z/
Oldham TX-
630 PM CDT SUN SEP 17 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN OLDHAM COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area, therefore the warning has been cancelled.

LAT...LON 3576 10244 3578 10231 3563 10232 3563 10240
      3564 10244 3570 10250
TIME...MOT...LOC 2330Z 200DEG 30KT 3588 10239 

$$

TXC205-172345-
/O.CON.KAMA.SV.W.0281.000000T0000Z-170917T2345Z/
Hartley TX-
630 PM CDT SUN SEP 17 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR SOUTHEASTERN HARTLEY COUNTY...

At 630 PM CDT, a severe thunderstorm was located over Hartley, or 14
miles southeast of Dalhart, moving north at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Minor damage to roofs, siding, and trees is possible. Hail 
         damage to vehicles is expected. 

Locations impacted include...
Channing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3576 10244 3578 10231 3563 10232 3563 10240
      3564 10244 3570 10250
TIME...MOT...LOC 2330Z 200DEG 30KT 3588 10239 

HAIL...1.00IN
WIND...60MPH
 
$$

DGW

670 
WWUS54 KAMA 172340
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
640 PM CDT SUN SEP 17 2017

TXC205-172350-
/O.EXP.KAMA.SV.W.0281.000000T0000Z-170917T2345Z/
Hartley TX-
640 PM CDT SUN SEP 17 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HARTLEY COUNTY
WILL EXPIRE AT 645 PM CDT...
    
The severe thunderstorm which prompted the warning has 
weakened, therefore the warning will be allowed to expire.

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

LAT...LON 3576 10244 3578 10231 3563 10232 3563 10240
      3564 10244 3570 10250
TIME...MOT...LOC 2340Z 200DEG 30KT 3593 10237 

$$

DGW

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 Sep 17, 1:49 PM CDT, 3 hours 57 minutes earlier.

Area forecast discussion, Sep 17, 1:49 PM CDT, 3 hours 57 minutes before

Area Forecast Discussion...UPDATED
National Weather Service Amarillo TX
149 PM CDT Sun Sep 17 2017

.UPDATE...
See long term section below.

.SHORT TERM...

Bottom line up top:
-Severe weather expected
-Main hazards will be large hail(up to 1.75in) and damaging winds (up to 70 mph)
-Additional hazards are for an isolated tornado (see below)
-Greatest area to see severe: along and south of a Dalhart to Perryton line
-Timing of Hazards: 4PM through Midnight
-Storm motions: East at 25 to 35 mph

Details: Hi-res models continue to show the potential for severe
weather this afternoon and into the overnight hours primarily
across the southern and eastern Texas Panhandle. In fact we are
already seeing discrete storms forming along the eastern range of
the New Mexico Rockies. These storms are anticipated to move
across the eastern New Mexico Plains and into the Texas and
Oklahoma Panhandles around 4 PM to 5 PM this afternoon. Hodographs
show that while there may still be a few discrete storms as
convection moves into the southern portion of the area that they
will merge into a cluster of storms as they continue to progress
eastward. As storms move into the area we will see CAPE in the
1500 to 2500 J/kg range with deep layer shear of 40 kt. This will
be supportive of organized convection of the supercell variety
while discrete. Large hail up to golf balls will be possible with
damaging wind gusts up to 70 mph.

Storms which develop north of the above noted area, may be more of
the elevated variety given that those areas have been socked in
with low clouds throughout the day. Despite some portions of the
cloud back dissipating, they will still lag behind the rest of the
area on warming sufficiently to overcome the cap. This won't
prevent severe storms from moving over them, but it will limit the
northern extent of the isolated tornado risk.

Speaking of the tornado risk. Our risk for an isolated tornado
resides along the edge of our low clouds this morning. IR
satellite imagery showed a low cloud bank roughly from Dumas to
Borger to Lipscomb this morning. These low clouds have greatly
hindered warming throughout the day as evident of the 59 degree
temperature in Dumas as of noon. This will set up a thermal
gradient along where the clouds have been which could provide
enough additional low level lift and low level helicity this
afternoon for a brief spin up. This is especially true of any
storm which has a storm motion parallel to the gradient. The
orientation of the thermal gradient would also provide a
horizontal roll already in place for an updraft to ingest. This
presents our tornado threat. Hi-res models have struggled to
resolve this thermal gradient and persistent northerly winds north
of the boundary.

Storm are expected to move across the Panhandle through the
overnight hours before exiting around 3am. We expect to see the
severe risk diminish after midnight.

Monday through Tuesday...
Mostly dry conditions are expected to
prevail through the first half of the work week; minus an isolated
storm across the eastern zones Monday afternoon. The most notable
weather impact will be the return of near record high
temperatures on Tuesday. Current forecast runs about 5 degrees
below record highs. These warm and windy conditions (sustained 25
to 30 mph) could also bring the risk for elevated fire weather
conditions across the northern zones. This risk could be mitigated
if the northern zones get a fair amount of precip tonight.

.LONG TERM...

The upper pattern over the Panhandles will see a transition from
zonal to southwesterly as we move closer to the weekend. This will
bring a return of convection especially Friday and Saturday.
There is some potential for strong to severe storms given the
synoptic pattern, but this could change as we move closer in time.

&&

.PRELIMINARY POINT TEMPS/POPS...
Amarillo TX                62  91  64  92  60 /  40  10  10   5   0
Beaver OK                  60  93  65  97  59 /  40  10  10   0   0
Boise City OK              55  87  57  89  54 /  30  10   5   0   0
Borger TX                  63  93  67  94  62 /  40  10  10   5   0
Boys Ranch TX              60  92  63  93  60 /  30  10  10   0   0
Canyon TX                  60  91  63  92  60 /  40  10  10   5   0
Clarendon TX               62  92  66  95  63 /  40  10  20   5   0
Dalhart TX                 56  90  58  91  55 /  30  10  10   0   0
Guymon OK                  58  92  62  94  57 /  30  10  10   0   0
Hereford TX                57  93  62  94  59 /  40  10  10   5   0
Lipscomb TX                61  92  66  96  61 /  40  10  20   5   0
Pampa TX                   61  90  65  92  61 /  40  10  10   5   0
Shamrock TX                64  94  67  95  65 /  50  10  20   5   0
Wellington TX              64  95  68  97  66 /  50  10  20   5   5

&&

14

Hazardous weather outlook, Sep 17, 1:04 PM CDT, 4 hours 42 minutes before

Hazardous Weather Outlook
National Weather Service Amarillo TX
104 PM CDT Sun Sep 17 2017

OKZ001>003-TXZ001>020-180615-
Cimarron-Texas-Beaver-Dallam-Sherman-Hansford-Ochiltree-Lipscomb-
Hartley-Moore-Hutchinson-Roberts-Hemphill-Oldham-Potter-Carson-
Gray-Wheeler-Deaf Smith-Randall-Armstrong-Donley-Collingsworth-
104 PM CDT Sun Sep 17 2017

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

.DAY ONE...This Afternoon and Tonight.

Severe thunderstorms are expected this afternoon and tonight for
the majority of the Texas and Oklahoma Panhandles. Our primary
severe hazards will be damaging wind gusts up to 70 mph and large
hail up to the size of golf balls. There is also a possibility of
a brief tornado mainly for the southern Texas Panhandle.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Thunderstorms will be possible Monday night then again on Thursday
through Saturday across parts of the Panhandles. At this time,
the threat for organized severe weather appears to be low.

Elevated fire weather may be possible for the Oklahoma and
northwestern Texas Panhandle Tuesday afternoon due to low relative
humidities and strong winds.

.SPOTTER INFORMATION STATEMENT...

Spotters should be prepared to activate this afternoon and
Tonight once severe weather develops.

In the hours before

Special weather statement, Sep 17, 3:49 PM CDT, 1 hour 57 minutes before

Special Weather Statement
National Weather Service Amarillo TX
349 PM CDT SUN SEP 17 2017

TXZ016-172115-
Deaf Smith TX-
349 PM CDT SUN SEP 17 2017

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN DEAF SMITH COUNTY UNTIL
415 PM CDT...

At 348 PM CDT, Doppler radar was tracking a strong thunderstorm 6
miles north of Summerfield, or 8 miles west of Hereford, moving
northeast at 30 mph.

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

Locations impacted include...
Hereford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take shelter in a sturdy building if threatening weather approaches.

&&

LAT...LON 3475 10264 3476 10270 3515 10249 3498 10217
      3497 10217 3474 10246
TIME...MOT...LOC 2048Z 211DEG 25KT 3482 10255

DGW

Special weather statement, Sep 17, 4:19 PM CDT, 1 hour 27 minutes before

Special Weather Statement
National Weather Service Amarillo TX
419 PM CDT SUN SEP 17 2017

TXZ016-172145-
Deaf Smith TX-
419 PM CDT SUN SEP 17 2017

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN DEAF SMITH COUNTY UNTIL
445 PM CDT...

At 419 PM CDT, Doppler radar was tracking a strong thunderstorm 4
miles northeast of Rhea, or 10 miles northwest of Friona, moving
northeast at 25 mph.

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

Locations impacted include...
Simms and Bootleg.

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 3514 10304 3504 10255 3475 10273 3475 10304
TIME...MOT...LOC 2119Z 205DEG 23KT 3471 10288

DGW

Special weather statement, Sep 17, 5:26 PM CDT, 20 minutes before

Special Weather Statement
National Weather Service Amarillo TX
526 PM CDT SUN SEP 17 2017

TXZ011-016-172245-
Deaf Smith TX-Oldham TX-
526 PM CDT SUN SEP 17 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN OLDHAM AND
NORTHEASTERN DEAF SMITH COUNTIES UNTIL 545 PM CDT...

At 526 PM CDT, Doppler radar was tracking a strong thunderstorm 5
miles southwest of Wildorado, or 7 miles southeast of Vega, moving
north at 15 mph.

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

Locations impacted include...
Wildorado.

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 3514 10246 3532 10227 3524 10217 3521 10217
      3509 10222
TIME...MOT...LOC 2226Z 200DEG 11KT 3517 10232

DGW

Local storm report, Sep 17, 5:34 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
534 PM CDT SUN SEP 17 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0528 PM     HAIL             5 W ADRIAN              35.28N 102.74W
09/17/2017  E1.50 INCH       OLDHAM             TX   TRAINED SPOTTER

            HAIL COVERED THE GROUND

&&

EVENT NUMBER AMA1700855

MJG

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 3:49 PM CDT	Special Weather Statement	AMA	Deaf Smith	26 min
Sep 17, 3:59 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Oldham, Potter, Randall	61 min
Sep 17, 4:19 PM CDT	Special Weather Statement	AMA	Deaf Smith	26 min
Sep 17, 4:22 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith	53 min
Sep 17, 5:08 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Oldham	67 min
Sep 17, 5:24 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Moore, Oldham, Potter	66 min
Sep 17, 5:26 PM CDT	Special Weather Statement	AMA	Oldham	19 min
Sep 17, 6:17 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Oldham	41 min

Nearby

Severe Thunderstorm Warnings in Texas, 2017 Every severe thunderstorm warning in 2017

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.