Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 248, NWS Amarillo, TX

August 12, 2021Dallam County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Aug 12, 2021, 4:03 PM CDT for Dallam 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 outline as issued.

The facts

Issued: Aug 12, 2021, 4:03 PM CDT (21:03 UTC)
Expired: Aug 12, 2021, 4:45 PM CDT
In force: 42 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Dallam County, TX

The radar

The Amarillo radar (KAMA), 150 km from the middle of the area, began a volume at 21:03 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, 9.1 hours before the alert went out and 151 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: 346 J/kg
Mixed-layer CIN: -166 J/kg
Mixed-layer LCL: 1810 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

478 
WUUS54 KAMA 122103
SVRAMA
TXC111-122145-
/O.NEW.KAMA.SV.W.0248.210812T2103Z-210812T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
403 PM CDT Thu Aug 12 2021

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Western Dallam County in the Panhandle of Texas...

* Until 445 PM CDT.

* At 403 PM CDT, a severe thunderstorm was located 8 miles northwest
  of Ware, or 22 miles northwest of Dalhart, moving north at 15 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...
  Ware.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3614 10272 3622 10298 3649 10292 3638 10248
TIME...MOT...LOC 2103Z 199DEG 12KT 3627 10282 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LFM

2 follow-up statements

625 
WWUS54 KAMA 122121
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
421 PM CDT Thu Aug 12 2021

TXC111-122145-
/O.CON.KAMA.SV.W.0248.000000T0000Z-210812T2145Z/
Dallam TX-
421 PM CDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR WESTERN DALLAM COUNTY...

At 420 PM CDT, a severe thunderstorm was located 10 miles northwest
of Ware, or 22 miles east of Clayton, moving north at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Ware.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3614 10272 3622 10298 3645 10293 3638 10248
TIME...MOT...LOC 2120Z 199DEG 12KT 3633 10280 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LFM

236 
WWUS54 KAMA 122136
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
436 PM CDT Thu Aug 12 2021

TXC111-122145-
/O.EXP.KAMA.SV.W.0248.000000T0000Z-210812T2145Z/
Dallam TX-
436 PM CDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN DALLAM COUNTY WILL
EXPIRE AT 445 PM CDT...
    
The severe thunderstorm which prompted the warning has weakened. 
Therfore, the warning will be allowed to expire.  However gusty 
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3614 10272 3622 10298 3645 10293 3638 10248
TIME...MOT...LOC 2135Z 199DEG 12KT 3636 10279 

$$

LFM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 3:16 PM CDT	Special Weather Statement	AMA	Hartley	29 min
Aug 12, 3:44 PM CDT	Special Weather Statement	AMA	Hartley	31 min
Aug 12, 4:14 PM CDT	Severe Thunderstorm Warning	AMA	Moore, Sherman	46 min
Aug 12, 4:41 PM CDT	Special Weather Statement	AMA	Armstrong	34 min
Aug 12, 4:48 PM CDT	Areal Flood Advisory	AMA	Hartley, Moore, Sherman	3 hr
Aug 12, 5:05 PM CDT	Special Weather Statement	AMA	Potter	25 min
Aug 12, 5:16 PM CDT	Special Weather Statement	AMA	Armstrong	29 min
Aug 12, 5:29 PM CDT	Special Weather Statement	AMA	Armstrong	31 min
Aug 12, 5:42 PM CDT	Special Weather Statement	AMA	Randall	33 min
Aug 12, 5:52 PM CDT	Severe Thunderstorm Warning	AMA	Randall	38 min
Aug 12, 5:58 PM CDT	Special Weather Statement	AMA	Potter	32 min
Aug 12, 6:13 PM CDT	Special Weather Statement	AMA	Armstrong	32 min
Aug 12, 6:24 PM CDT	Severe Thunderstorm Warning	AMA	Potter, Randall	46 min
Aug 12, 6:57 PM CDT	Special Weather Statement	AMA	Hutchinson	33 min

Nearby

Severe Thunderstorm Warnings in Texas, 2021 Every severe thunderstorm warning in 2021

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.