Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 247, NWS Amarillo, TX

August 11, 2021Hansford County, Moore County, Sherman County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Aug 11, 2021, 4:58 PM CDT for Hansford County, Moore County, Sherman County, Texas. It was in force for 92 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 11, 2021, 4:58 PM CDT (21:58 UTC)
Expired: Aug 11, 2021, 6:30 PM CDT
In force: 92 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hansford County, TX, Moore County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 98 km from the middle of the area, began a volume at 22:00 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, 10.0 hours before the alert went out and 98 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: 529 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 1833 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

200 
WUUS54 KAMA 112158
SVRAMA
TXC195-341-421-112330-
/O.NEW.KAMA.SV.W.0247.210811T2158Z-210811T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
458 PM CDT Wed Aug 11 2021

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Southwestern Hansford County in the Panhandle of Texas...
  Southeastern Sherman County in the Panhandle of Texas...
  Northern Moore County in the Panhandle of Texas...

* Until 630 PM CDT.

* At 457 PM CDT, a severe thunderstorm was located near Sunray, or 10
  miles northeast of Dumas, moving northeast at 10 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...
  Dumas, Cactus and Sunray. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3631 10163 3621 10138 3605 10156 3605 10162
      3599 10162 3588 10175 3589 10206 3632 10196
TIME...MOT...LOC 2157Z 216DEG 10KT 3597 10184 

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

$$

LG

7 follow-up statements

137 
WWUS54 KAMA 112205
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
505 PM CDT Wed Aug 11 2021

TXC195-341-421-112330-
/O.CON.KAMA.SV.W.0247.000000T0000Z-210811T2330Z/
Hansford TX-Sherman TX-Moore TX-
505 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHWESTERN HANSFORD...SOUTHEASTERN SHERMAN AND NORTHERN MOORE
COUNTIES...

At 505 PM CDT, a severe thunderstorm was located over Sunray, or 11
miles northeast of Dumas, moving northeast at 10 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...
Dumas, Cactus and Sunray. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3631 10163 3621 10138 3605 10156 3605 10162
      3599 10162 3588 10175 3589 10206 3632 10196
TIME...MOT...LOC 2205Z 216DEG 10KT 3599 10182 

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

$$

LG

374 
WWUS54 KAMA 112220
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
520 PM CDT Wed Aug 11 2021

TXC195-341-421-112330-
/O.CON.KAMA.SV.W.0247.000000T0000Z-210811T2330Z/
Hansford TX-Sherman TX-Moore TX-
520 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHWESTERN HANSFORD...SOUTHEASTERN SHERMAN AND NORTHERN MOORE
COUNTIES...

At 520 PM CDT, a severe thunderstorm was located near Sunray, or 14
miles northeast of Dumas, moving north at 10 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...
Dumas, Cactus and Sunray. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3631 10163 3621 10138 3605 10156 3605 10162
      3599 10162 3588 10175 3589 10206 3632 10196
TIME...MOT...LOC 2220Z 201DEG 9KT 3600 10177 

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

$$

LG

639 
WWUS54 KAMA 112237
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
537 PM CDT Wed Aug 11 2021

TXC195-341-421-112330-
/O.CON.KAMA.SV.W.0247.000000T0000Z-210811T2330Z/
Hansford TX-Sherman TX-Moore TX-
537 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHWESTERN HANSFORD...SOUTHEASTERN SHERMAN AND NORTHERN MOORE
COUNTIES...

At 537 PM CDT, a severe thunderstorm was located over Cactus, or 10
miles north of Dumas, moving northeast at 10 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Cactus and Sunray. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3631 10163 3621 10138 3605 10156 3605 10162
      3599 10162 3591 10176 3589 10206 3632 10196
TIME...MOT...LOC 2237Z 221DEG 10KT 3602 10199 

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

$$

LG

665 
WWUS54 KAMA 112255
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
555 PM CDT Wed Aug 11 2021

TXC195-341-421-112330-
/O.CON.KAMA.SV.W.0247.000000T0000Z-210811T2330Z/
Hansford TX-Sherman TX-Moore TX-
555 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHWESTERN HANSFORD...SOUTHEASTERN SHERMAN AND NORTHERN MOORE
COUNTIES...

At 555 PM CDT, a severe thunderstorm was located over Cactus, or 10
miles north of Dumas, moving northeast at 5 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...
Cactus and Sunray. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3630 10169 3619 10159 3605 10156 3605 10162
      3599 10162 3591 10176 3589 10206 3632 10196
TIME...MOT...LOC 2255Z 222DEG 6KT 3602 10198 

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

$$

LG

035 
WWUS54 KAMA 112312
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
612 PM CDT Wed Aug 11 2021

TXC195-112321-
/O.CAN.KAMA.SV.W.0247.000000T0000Z-210811T2330Z/
Hansford TX-
612 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HANSFORD 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 3620 10180 3613 10175 3599 10176 3591 10176
      3589 10206 3632 10196
TIME...MOT...LOC 2311Z 168DEG 4KT 3602 10202 

$$

TXC341-421-112330-
/O.CON.KAMA.SV.W.0247.000000T0000Z-210811T2330Z/
Sherman TX-Moore TX-
612 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTH CENTRAL SHERMAN AND NORTHWESTERN MOORE COUNTIES...

At 611 PM CDT, a severe thunderstorm was located over Cactus, or 10
miles north of Dumas, and is nearly stationary.

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...
Cactus and Sunray. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3620 10180 3613 10175 3599 10176 3591 10176
      3589 10206 3632 10196
TIME...MOT...LOC 2311Z 168DEG 4KT 3602 10202 

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

$$

LG

548 
WWUS54 KAMA 112323
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
623 PM CDT Wed Aug 11 2021

TXC341-421-112330-
/O.CON.KAMA.SV.W.0247.000000T0000Z-210811T2330Z/
Sherman TX-Moore TX-
623 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTH CENTRAL SHERMAN AND NORTHWESTERN MOORE COUNTIES...

At 622 PM CDT, a severe thunderstorm was located over Cactus, or 11
miles north of Dumas, and is nearly stationary.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Cactus.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3611 10189 3605 10184 3597 10187 3591 10194
      3589 10206 3616 10200
TIME...MOT...LOC 2322Z 206DEG 3KT 3603 10201 

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

$$

LG

557 
WWUS54 KAMA 112329
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
629 PM CDT Wed Aug 11 2021

TXC341-421-112338-
/O.EXP.KAMA.SV.W.0247.000000T0000Z-210811T2330Z/
Sherman TX-Moore TX-
629 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SHERMAN AND
NORTHWESTERN MOORE COUNTIES WILL EXPIRE AT 630 PM CDT...
                
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 will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3611 10189 3605 10184 3597 10187 3591 10194
      3589 10206 3616 10200
TIME...MOT...LOC 2328Z 216DEG 10KT 3604 10200 

$$

LG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 4:08 PM CDT	Special Weather Statement	AMA	Sherman	37 min
Aug 11, 4:26 PM CDT	Special Weather Statement	AMA	Dallam	34 min
Aug 11, 4:32 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Sherman	74 min
Aug 11, 4:43 PM CDT	Special Weather Statement	AMA	Moore	32 min
Aug 11, 5:02 PM CDT	Special Weather Statement	AMA	Deaf Smith	28 min
Aug 11, 5:48 PM CDT	Special Weather Statement	AMA	Dallam	27 min
Aug 11, 6:20 PM CDT	Areal Flood Advisory	AMA	Moore	3 hr
Aug 11, 6:30 PM CDT	Special Weather Statement	AMA	Moore	30 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.