Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 202, NWS Amarillo, TX

July 12, 2021Donley County, Gray County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 12, 2021, 6:54 PM CDT for Donley County, Gray County, Texas. It was in force for 32 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: Jul 12, 2021, 6:54 PM CDT (23:54 UTC)
Expired: Jul 12, 2021, 7:26 PM CDT
In force: 32 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Donley County, TX, Gray County, TX

The radar

The Amarillo radar (KAMA), 80 km from the middle of the area, began a volume at 23:55 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, 11.9 hours before the alert went out and 79 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: 98 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

235 
WUUS54 KAMA 122354
SVRAMA
TXC129-179-130100-
/O.NEW.KAMA.SV.W.0202.210712T2354Z-210713T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
654 PM CDT Mon Jul 12 2021

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Southwestern Gray County in the Panhandle of Texas...
  North central Donley County in the Panhandle of Texas...

* Until 800 PM CDT.

* At 654 PM CDT, a severe thunderstorm was located 4 miles northwest
  of Alanreed, or 22 miles north of Clarendon, moving west at 10 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to roofs, siding, and trees is possible. 
           Hail may accumulate on roadways causing hazardous travel.

* Locations impacted include...
  Lake Mcclellan and Alanreed. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3535 10075 3518 10067 3505 10094 3531 10106
TIME...MOT...LOC 2354Z 069DEG 5KT 3525 10080 

HAIL...0.75IN
WIND...60MPH
 
$$

Ward

2 follow-up statements

910 
WWUS54 KAMA 130020
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
720 PM CDT Mon Jul 12 2021

TXC129-179-130100-
/O.CON.KAMA.SV.W.0202.000000T0000Z-210713T0100Z/
Gray TX-Donley TX-
720 PM CDT Mon Jul 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR SOUTHWESTERN GRAY AND NORTH CENTRAL DONLEY COUNTIES...

At 719 PM CDT, a severe thunderstorm was located over Lake Mcclellan,
or 19 miles north of Clarendon, moving south at 5 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Lake Mcclellan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3529 10079 3515 10076 3505 10094 3529 10105
TIME...MOT...LOC 0019Z 005DEG 5KT 3522 10090 

HAIL...<.75IN
WIND...60MPH
 
$$

Ward

378 
WWUS54 KAMA 130026
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
726 PM CDT Mon Jul 12 2021

TXC129-179-130035-
/O.CAN.KAMA.SV.W.0202.000000T0000Z-210713T0100Z/
Gray TX-Donley TX-
726 PM CDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GRAY AND NORTH
CENTRAL DONLEY COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

LAT...LON 3529 10079 3515 10076 3505 10094 3529 10105
TIME...MOT...LOC 0024Z 069DEG 5KT 3522 10091 

$$

Ward

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 6:25 PM CDT	Special Weather Statement	AMA	Gray	35 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.