Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 187, NWS Amarillo, TX

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

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 4, 2021, 6:20 PM CDT for Texas County, Oklahoma; Hansford County, Sherman County, Texas. It was in force for 85 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, 6:20 PM CDT (23:20 UTC)
Expired: Jul 4, 2021, 7:45 PM CDT
In force: 85 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

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

The radar

The Amarillo radar (KAMA), 163 km from the middle of the area, began a volume at 23:20 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, 7:40 PM CDT	TSTM WND GST 62	1 Wsw Guymon, OK	ASOS STATION KGUY GUYMON (ASOS).
Jul 4, 7:54 PM CDT	TSTM WND GST 59	1 Wsw Guymon, OK	ASOS STATION KGUY GUYMON (ASOS).

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 12:00Z, 11.3 hours before the alert went out and 163 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: 997 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

350 
WUUS54 KAMA 042320
SVRAMA
OKC139-TXC195-421-050045-
/O.NEW.KAMA.SV.W.0187.210704T2320Z-210705T0045Z/

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

The National Weather Service in Amarillo has issued a

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

* Until 745 PM CDT.

* At 620 PM CDT, a severe thunderstorm was located 5 miles north of
  Guymon, moving south at 10 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...
  Guymon, Hooker, Goodwell, Optima, Hardesty, Hough 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 3699 10160 3688 10108 3639 10117 3635 10157
      3653 10191
TIME...MOT...LOC 2320Z 014DEG 9KT 3676 10145 

HAIL...1.25IN
WIND...60MPH
 
$$

LG

5 follow-up statements

942 
WWUS54 KAMA 042323
SVSAMA

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

OKC139-TXC195-421-050045-
/O.CON.KAMA.SV.W.0187.000000T0000Z-210705T0045Z/
Texas OK-Hansford TX-Sherman TX-
623 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR CENTRAL TEXAS...NORTHERN HANSFORD AND NORTHEASTERN SHERMAN
COUNTIES...

At 623 PM CDT, a severe thunderstorm was located 4 miles north of
Guymon, moving south at 10 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, Optima, Hardesty, Hough 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 3699 10160 3688 10108 3639 10117 3635 10157
      3653 10191
TIME...MOT...LOC 2323Z 021DEG 9KT 3675 10148 

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

LG

322 
WWUS54 KAMA 042337
SVSAMA

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

OKC139-TXC195-421-050045-
/O.CON.KAMA.SV.W.0187.000000T0000Z-210705T0045Z/
Texas OK-Hansford TX-Sherman TX-
637 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR CENTRAL TEXAS...NORTHERN HANSFORD AND NORTHEASTERN SHERMAN
COUNTIES...

At 637 PM CDT, a severe thunderstorm was located over Guymon, moving
south at 15 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...
Guymon, Hooker, Goodwell, Optima, Hardesty, Hough 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 3699 10160 3688 10108 3639 10117 3635 10157
      3653 10191
TIME...MOT...LOC 2337Z 019DEG 15KT 3669 10151 

HAIL...1.25IN
WIND...60MPH
 
$$

LG

071 
WWUS54 KAMA 042348
SVSAMA

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

OKC139-TXC195-421-050045-
/O.CON.KAMA.SV.W.0187.000000T0000Z-210705T0045Z/
Texas OK-Hansford TX-Sherman TX-
648 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR CENTRAL TEXAS...NORTHERN HANSFORD AND NORTHEASTERN SHERMAN
COUNTIES...

At 648 PM CDT, a severe thunderstorm was located 5 miles west of
Guymon, moving southwest at 15 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, Optima, Hardesty, Hough 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 3699 10160 3688 10108 3639 10117 3635 10157
      3653 10191
TIME...MOT...LOC 2348Z 034DEG 15KT 3668 10157 

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

LG

296 
WWUS54 KAMA 050002
SVSAMA

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

OKC139-TXC195-421-050045-
/O.CON.KAMA.SV.W.0187.000000T0000Z-210705T0045Z/
Texas OK-Hansford TX-Sherman TX-
702 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR CENTRAL TEXAS...NORTHERN HANSFORD AND NORTHEASTERN SHERMAN
COUNTIES...

At 702 PM CDT, a severe thunderstorm was located 4 miles north of
Goodwell, or 9 miles west of Guymon, moving southwest at 15 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, Optima, Hardesty, Hough 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 3699 10160 3688 10108 3639 10117 3635 10157
      3653 10191
TIME...MOT...LOC 0002Z 051DEG 14KT 3666 10165 

HAIL...1.75IN
WIND...60MPH
 
$$

LG

160 
WWUS54 KAMA 050021
SVSAMA

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

OKC139-TXC195-421-050045-
/O.CON.KAMA.SV.W.0187.000000T0000Z-210705T0045Z/
Texas OK-Hansford TX-Sherman TX-
721 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR SOUTHERN TEXAS...NORTHERN HANSFORD AND NORTHEASTERN SHERMAN
COUNTIES...

At 721 PM CDT, a severe thunderstorm was located 5 miles west of
Goodwell, or 16 miles southwest of Guymon, moving southwest at 20
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, Optima, Hardesty 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 3686 10167 3688 10108 3639 10117 3635 10157
      3653 10191
TIME...MOT...LOC 0021Z 050DEG 19KT 3658 10173 

HAIL...1.75IN
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, 3:04 AM CDT	Special Weather Statement	AMA	Texas	41 min
Jul 4, 3:47 PM CDT	Special Weather Statement	AMA	Texas	28 min
Jul 4, 4:14 PM CDT	Severe Thunderstorm Warning	AMA	Cimarron, Texas	91 min
Jul 4, 5:54 PM CDT	Special Weather Statement	AMA	Beaver	36 min
Jul 4, 6:10 PM CDT	Special Weather Statement	AMA	Texas	35 min
Jul 4, 6:22 PM CDT	Areal Flood Advisory	AMA	Texas	3 hr
Jul 4, 1:28 AM CDT	Special Weather Statement	AMA	Dallam	32 min
Jul 4, 11:42 AM CDT	Special Weather Statement	AMA	Roberts	48 min
Jul 4, 12:34 PM CDT	Special Weather Statement	AMA	Gray	41 min
Jul 4, 2:42 PM CDT	Special Weather Statement	AMA	Sherman	48 min
Jul 4, 3:13 PM CDT	Special Weather Statement	AMA	Sherman	32 min
Jul 4, 3:21 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Moore, Sherman	54 min
Jul 4, 3:50 PM CDT	Areal Flood Advisory	AMA	Dallam	3 hr
Jul 4, 4:32 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Moore, Oldham, Potter	65 min
Jul 4, 4:46 PM CDT	Areal Flood Advisory	AMA	Moore	3 hr
Jul 4, 4:49 PM CDT	Areal Flood Advisory	AMA	Sherman	2 hr
Jul 4, 5:03 PM CDT	Areal Flood Advisory	AMA	Dallam, Hartley	4 hr
Jul 4, 5:39 PM CDT	Flash Flood Warning	AMA	Dallam, Hartley	3 hr
Jul 4, 5:44 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Moore, Sherman	91 min
Jul 4, 6:51 PM CDT	Special Weather Statement	AMA	Dallam	24 min
Jul 4, 6:59 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	91 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.