Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 191, NWS Amarillo, TX

July 4, 2021Dallam County, Hansford County, Sherman County, Texas; Cimarron County, Texas County, Oklahoma

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 4, 2021, 7:42 PM CDT for Dallam County, Hansford County, Sherman County, Texas; Cimarron County, Texas County, Oklahoma. It was in force for 93 min. 2 reports 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: Jul 4, 2021, 7:42 PM CDT (00:42 UTC)
Expired: Jul 4, 2021, 9:15 PM CDT
In force: 93 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Cimarron County, OK, Texas County, OK, Dallam County, TX, Hansford County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 135 km from the middle of the area, began a volume at 00:44 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
Jul 4, 7:54 PM CDT	TSTM WND GST 59	1 Wsw Guymon, OK	ASOS STATION KGUY GUYMON (ASOS).
Jul 4, 8:10 PM CDT	TSTM WND GST 73	2 Ene Goodwell, OK	MESONET STATION GOOD GOODWELL. INITIAL SEVERE WIND GUST OCCURRED AT 810 PM CDT WITH PEAK GUST AROUND 815 PM CDT.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 4, 3:37 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 0.7 hours before the alert went out and 136 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: 2304 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1243 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 7.9

Open this sounding in Storm Lab

The text

As transmitted.

988 
WUUS54 KAMA 050042
SVRAMA
OKC025-139-TXC111-195-421-050215-
/O.NEW.KAMA.SV.W.0191.210705T0042Z-210705T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
742 PM CDT Sun Jul 4 2021

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Southwestern Texas County in the Panhandle of Oklahoma...
  Southeastern Cimarron County in the Panhandle of Oklahoma...
  Northwestern Hansford County in the Panhandle of Texas...
  Sherman County in the Panhandle of Texas...
  Eastern Dallam County in the Panhandle of Texas...

* Until 915 PM CDT.

* At 741 PM CDT, a severe thunderstorm was located 5 miles northwest
  of Texhoma, or 19 miles northeast of Stratford, moving southwest at
  20 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, Stratford, Goodwell, Conlen, Griggs and Texhoma. 

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 3660 10126 3605 10215 3605 10226 3666 10235
      3674 10140
TIME...MOT...LOC 0041Z 061DEG 19KT 3656 10185 

HAIL...1.50IN
WIND...60MPH
 
$$

LG

5 follow-up statements

641 
WWUS54 KAMA 050104
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
804 PM CDT Sun Jul 4 2021

OKC025-139-TXC111-195-421-050215-
/O.CON.KAMA.SV.W.0191.000000T0000Z-210705T0215Z/
Texas OK-Cimarron OK-Hansford TX-Sherman TX-Dallam TX-
804 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHWESTERN TEXAS...SOUTHEASTERN CIMARRON...NORTHWESTERN
HANSFORD...SHERMAN AND EASTERN DALLAM COUNTIES...

At 804 PM CDT, a severe thunderstorm was located 10 miles southeast
of Griggs, or 12 miles northeast of Stratford, moving southwest at 20
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, Stratford, Goodwell, Conlen, Griggs and Texhoma. 

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 3660 10126 3605 10215 3605 10226 3666 10235
      3674 10140
TIME...MOT...LOC 0104Z 061DEG 19KT 3650 10199 

HAIL...1.50IN
WIND...60MPH
 
$$

LG

133 
WWUS54 KAMA 050119
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
819 PM CDT Sun Jul 4 2021

OKC025-139-TXC111-195-421-050215-
/O.CON.KAMA.SV.W.0191.000000T0000Z-210705T0215Z/
Texas OK-Cimarron OK-Hansford TX-Sherman TX-Dallam TX-
819 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHWESTERN TEXAS...SOUTHEASTERN CIMARRON...NORTHWESTERN
HANSFORD...SHERMAN AND EASTERN DALLAM COUNTIES...

At 819 PM CDT, a severe thunderstorm was located 6 miles south of
Goodwell, or 15 miles southwest of Guymon, moving southwest at 25
mph.

HAZARD...Two inch 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, Stratford, Goodwell, Conlen, Griggs and Texhoma. 

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 3660 10126 3605 10215 3605 10226 3666 10235
      3674 10140
TIME...MOT...LOC 0119Z 038DEG 20KT 3650 10162 

HAIL...2.00IN
WIND...60MPH
 
$$

LG

460 
WWUS54 KAMA 050123
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
823 PM CDT Sun Jul 4 2021

OKC025-139-TXC111-195-421-050215-
/O.CON.KAMA.SV.W.0191.000000T0000Z-210705T0215Z/
Texas OK-Cimarron OK-Hansford TX-Sherman TX-Dallam TX-
823 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHWESTERN TEXAS...SOUTHEASTERN CIMARRON...NORTHWESTERN
HANSFORD...SHERMAN AND EASTERN DALLAM COUNTIES...

At 823 PM CDT, automated weather equipment reported a severe
thunderstorm was located 7 miles south of Goodwell, or 16 miles
southwest of Guymon, moving southwest at 20 mph.

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

SOURCE...Automated weather equipment.

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...
Guymon, Stratford, Goodwell, Conlen, Griggs and Texhoma. 

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 3660 10126 3605 10215 3605 10226 3666 10235
      3674 10140
TIME...MOT...LOC 0123Z 061DEG 19KT 3649 10164 

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

LG

073 
WWUS54 KAMA 050141
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
841 PM CDT Sun Jul 4 2021

OKC025-139-TXC111-195-421-050215-
/O.CON.KAMA.SV.W.0191.000000T0000Z-210705T0215Z/
Texas OK-Cimarron OK-Hansford TX-Sherman TX-Dallam TX-
841 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHWESTERN TEXAS...SOUTHEASTERN CIMARRON...NORTHWESTERN
HANSFORD...SHERMAN AND EASTERN DALLAM COUNTIES...

At 840 PM CDT, a severe thunderstorm was located 8 miles southeast of
Texhoma, or 21 miles east of Stratford, moving southwest at 25 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, Stratford, Goodwell, Conlen, Griggs and Texhoma. 

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 3660 10126 3605 10215 3605 10226 3666 10235
      3674 10140
TIME...MOT...LOC 0140Z 039DEG 22KT 3641 10170 

HAIL...1.50IN
WIND...60MPH
 
$$

LG

968 
WWUS54 KAMA 050149
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
849 PM CDT Sun Jul 4 2021

OKC025-139-TXC111-195-421-050215-
/O.CON.KAMA.SV.W.0191.000000T0000Z-210705T0215Z/
Texas OK-Cimarron OK-Hansford TX-Sherman TX-Dallam TX-
849 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHWESTERN TEXAS...SOUTHEASTERN CIMARRON...NORTHWESTERN
HANSFORD...SHERMAN AND EASTERN DALLAM COUNTIES...

At 849 PM CDT, a severe thunderstorm was located 8 miles south of
Texhoma, or 18 miles east of Stratford, moving southwest at 25 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...
Stratford, Griggs, Conlen and Texhoma. 

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 3605 10215 3605 10226 3666 10235 3654 10160
      3649 10144
TIME...MOT...LOC 0149Z 043DEG 20KT 3638 10175 

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

LG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 7:06 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Oldham	84 min
Jul 4, 7:31 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	89 min
Jul 4, 7:43 PM CDT	Areal Flood Advisory	AMA	Deaf Smith, Oldham	90 min
Jul 4, 7:52 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Oldham	83 min
Jul 4, 9:00 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	50 min
Jul 4, 9:00 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Moore, Sherman	60 min
Jul 4, 9:52 PM CDT	Areal Flood Advisory	AMA	Dallam, Hartley	53 min
Jul 4, 10:28 PM CDT	Special Weather Statement	AMA	Oldham	62 min
Jul 4, 10:40 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Oldham	65 min
Jul 4, 11:05 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Oldham, Potter, Randall	55 min
Jul 4, 11:28 PM CDT	Special Weather Statement	AMA	Deaf Smith	47 min
Jul 4, 11:36 PM CDT	Special Weather Statement	AMA	Gray	24 min
Jul 4, 11:39 PM CDT	Special Weather Statement	AMA	Randall	36 min
Jul 5, 12:01 AM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Donley, Gray	59 min
Jul 5, 12:35 AM CDT	Special Weather Statement	AMA	Gray	25 min
Jul 5, 12:59 AM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson	61 min
Jul 5, 1:31 AM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Potter, Randall	74 min
Jul 5, 2:34 AM CDT	Flash Flood Warning	AMA	Randall	112 min
Jul 5, 2:43 AM CDT	Special Weather Statement	AMA	Randall	47 min
Jul 5, 2:57 AM CDT	Areal Flood Advisory	AMA	Donley	3 hr
Jul 5, 6:38 AM CDT	Areal Flood Advisory	AMA	Collingsworth, Wheeler	3 hr

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.