Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 265, NWS Amarillo, TX

August 21, 2021Beaver County, Texas County, Oklahoma; Hansford County, Ochiltree County, Sherman County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Aug 21, 2021, 5:20 PM CDT for Beaver County, Texas County, Oklahoma; Hansford County, Ochiltree County, Sherman County, Texas. It was in force for 85 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 21, 2021, 5:20 PM CDT (22:20 UTC)
Expired: Aug 21, 2021, 6:45 PM CDT
In force: 85 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Beaver County, OK, Texas County, OK, Hansford County, TX, Ochiltree County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 157 km from the middle of the area, began a volume at 22:24 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.

What was reported inside it

Time	Report	Where	Remark
Aug 21, 5:55 PM CDT	HAIL 1.75	1 Nnw Boyd, OK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.3 hours before the alert went out and 157 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: 611 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1642 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

912 
WUUS54 KAMA 212220
SVRAMA
OKC007-139-TXC195-357-421-212345-
/O.NEW.KAMA.SV.W.0265.210821T2220Z-210821T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
520 PM CDT Sat Aug 21 2021

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Western Beaver County in the Panhandle of Oklahoma...
  Texas County in the Panhandle of Oklahoma...
  Northern Hansford County in the Panhandle of Texas...
  Northeastern Sherman County in the Panhandle of Texas...
  Northern Ochiltree County in the Panhandle of Texas...

* Until 645 PM CDT.

* At 520 PM CDT, a severe thunderstorm was located 10 miles north of
  Gruver, or 19 miles northwest of Spearman, moving north at 40 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...
  Guymon, Perryton, Hooker, Goodwell, Tyrone, Optima, Hardesty,
  Hough, Adams, Farnsworth, Boyd, Waka, Floris, Bryans Corner, Baker,
  Turpin and Balko.

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 3624 10065 3632 10174 3699 10178 3700 10064
TIME...MOT...LOC 2220Z 198DEG 34KT 3640 10143 

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

$$

LG

5 follow-up statements

335 
WWUS54 KAMA 212239
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
539 PM CDT Sat Aug 21 2021

OKC007-139-TXC195-357-421-212345-
/O.CON.KAMA.SV.W.0265.000000T0000Z-210821T2345Z/
Beaver OK-Texas OK-Hansford TX-Sherman TX-Ochiltree TX-
539 PM CDT Sat Aug 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR WESTERN BEAVER...TEXAS...NORTHERN HANSFORD...NORTHEASTERN SHERMAN
AND NORTHERN OCHILTREE COUNTIES...

At 539 PM CDT, a severe thunderstorm was located 8 miles southeast of
Guymon, moving northeast 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...
Guymon, Perryton, Hooker, Goodwell, Tyrone, Optima, Hardesty, Hough,
Adams, Boyd, Floris, Bryans Corner, Baker, Turpin and Balko.

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 3638 10065 3632 10174 3699 10178 3700 10064
TIME...MOT...LOC 2239Z 208DEG 29KT 3657 10141 

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

$$

LG

636 
WWUS54 KAMA 212253
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
553 PM CDT Sat Aug 21 2021

OKC007-139-TXC195-357-421-212345-
/O.CON.KAMA.SV.W.0265.000000T0000Z-210821T2345Z/
Beaver OK-Texas OK-Hansford TX-Sherman TX-Ochiltree TX-
553 PM CDT Sat Aug 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR WESTERN BEAVER...TEXAS...NORTHERN HANSFORD...NORTHEASTERN SHERMAN
AND NORTHWESTERN OCHILTREE COUNTIES...

At 553 PM CDT, a severe thunderstorm was located over Boyd, or 16
miles west of Beaver, moving north at 30 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...
Guymon, Hooker, Goodwell, Tyrone, Optima, Hardesty, Hough, Adams,
Boyd, Floris, Bryans Corner, Baker, Turpin and Balko.

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 3646 10065 3644 10175 3699 10178 3700 10064
TIME...MOT...LOC 2253Z 193DEG 26KT 3673 10081 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LG

487 
WWUS54 KAMA 212307
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
607 PM CDT Sat Aug 21 2021

TXC195-357-421-212317-
/O.CAN.KAMA.SV.W.0265.000000T0000Z-210821T2345Z/
Hansford TX-Sherman TX-Ochiltree TX-
607 PM CDT Sat Aug 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN HANSFORD...
NORTHEASTERN SHERMAN AND NORTHWESTERN OCHILTREE COUNTIES IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3653 10065 3653 10175 3699 10178 3700 10064
TIME...MOT...LOC 2307Z 196DEG 28KT 3686 10102 

$$

OKC007-139-212345-
/O.CON.KAMA.SV.W.0265.000000T0000Z-210821T2345Z/
Beaver OK-Texas OK-
607 PM CDT Sat Aug 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR WESTERN BEAVER AND TEXAS COUNTIES...

At 607 PM CDT, a severe thunderstorm was located over Baker, or 13
miles south of Liberal, moving north at 30 mph.

HAZARD...Ping pong 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...
Guymon, Hooker, Goodwell, Tyrone, Optima, Hardesty, Hough, Adams,
Boyd, Floris, Bryans Corner, Baker, Turpin and Balko.

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 3653 10065 3653 10175 3699 10178 3700 10064
TIME...MOT...LOC 2307Z 196DEG 28KT 3686 10102 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LG

304 
WWUS54 KAMA 212327
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
627 PM CDT Sat Aug 21 2021

OKC007-139-212345-
/O.CON.KAMA.SV.W.0265.000000T0000Z-210821T2345Z/
Beaver OK-Texas OK-
627 PM CDT Sat Aug 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHWESTERN BEAVER AND EASTERN TEXAS COUNTIES...

At 627 PM CDT, a severe thunderstorm was located 4 miles south of
Liberal, moving northeast at 35 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Tyrone, Hardesty, Baker, Adams, Boyd, Turpin and Floris. 

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 3668 10065 3653 10118 3653 10122 3699 10112
      3700 10064
TIME...MOT...LOC 2327Z 205DEG 32KT 3699 10092 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LG

195 
WWUS54 KAMA 212341
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
641 PM CDT Sat Aug 21 2021

OKC007-139-212351-
/O.EXP.KAMA.SV.W.0265.000000T0000Z-210821T2345Z/
Beaver OK-Texas OK-
641 PM CDT Sat Aug 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BEAVER AND
EASTERN TEXAS COUNTIES WILL EXPIRE AT 645 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3668 10065 3653 10118 3653 10122 3699 10112
      3700 10064
TIME...MOT...LOC 2341Z 198DEG 34KT 3709 10088 

$$

LG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 4:15 PM CDT	Severe Thunderstorm Warning	AMA	Beaver	90 min
Aug 21, 2:38 PM CDT	Special Weather Statement	AMA	Hemphill	67 min
Aug 21, 2:43 PM CDT	Special Weather Statement	AMA	Potter	62 min
Aug 21, 2:57 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Lipscomb, Ochiltree, Roberts	93 min
Aug 21, 3:32 PM CDT	Severe Thunderstorm Warning	AMA	Carson, Hutchinson, Moore, Potter	88 min
Aug 21, 3:42 PM CDT	Areal Flood Advisory	AMA	Hemphill	3 hr
Aug 21, 3:42 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Potter, Randall	69 min
Aug 21, 3:54 PM CDT	Areal Flood Advisory	AMA	Potter, Randall	10 min
Aug 21, 4:04 PM CDT	Flash Flood Warning	AMA	Potter, Randall	90 min
Aug 21, 4:33 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Hutchinson, Ochiltree, Roberts	70 min
Aug 21, 4:44 PM CDT	Special Weather Statement	AMA	Sherman	61 min
Aug 21, 5:14 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Potter, Randall	91 min
Aug 21, 6:18 PM CDT	Areal Flood Advisory	AMA	Armstrong, Randall	85 min
Aug 21, 6:18 PM CDT	Special Weather Statement	AMA	Hemphill	27 min

Nearby

Severe Thunderstorm Warnings in Texas, 2021 Severe Thunderstorm Warnings in Oklahoma, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.