Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 183, NWS Amarillo, TX

July 4, 20214 counties in Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 4, 2021, 3:21 PM CDT for 4 counties in Texas. It was in force for 54 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 4, 2021, 3:21 PM CDT (20:21 UTC)
Expired: Jul 4, 2021, 4:15 PM CDT
In force: 54 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Dallam County, TX, Hartley County, TX, Moore County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 123 km from the middle of the area, began a volume at 20:23 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, 8.4 hours before the alert went out and 123 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.

016 
WUUS54 KAMA 042021
SVRAMA
TXC111-205-341-421-042115-
/O.NEW.KAMA.SV.W.0183.210704T2021Z-210704T2115Z/

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

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Southwestern Sherman County in the Panhandle of Texas...
  Eastern Dallam County in the Panhandle of Texas...
  Northwestern Moore County in the Panhandle of Texas...
  Northeastern Hartley County in the Panhandle of Texas...

* Until 415 PM CDT.

* At 320 PM CDT, a severe thunderstorm was located 9 miles north of
  Conlen, or 11 miles west of Stratford, moving southeast 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...
  Dalhart, Stratford, Cactus and Conlen. 

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 3650 10206 3621 10169 3598 10204 3591 10258
      3650 10267
TIME...MOT...LOC 2020Z 326DEG 9KT 3636 10228 

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

LG

5 follow-up statements

473 
WWUS54 KAMA 042032
SVSAMA

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

TXC111-205-341-421-042115-
/O.CON.KAMA.SV.W.0183.000000T0000Z-210704T2115Z/
Sherman TX-Dallam TX-Moore TX-Hartley TX-
332 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHWESTERN SHERMAN...EASTERN DALLAM...NORTHWESTERN MOORE AND
NORTHEASTERN HARTLEY COUNTIES...

At 332 PM CDT, a severe thunderstorm was located 9 miles north of
Conlen, or 12 miles west of Stratford, moving south at 5 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...
Dalhart, Stratford, Cactus and Conlen. 

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 3650 10206 3621 10169 3598 10204 3591 10258
      3650 10267
TIME...MOT...LOC 2032Z 354DEG 6KT 3636 10229 

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

LG

611 
WWUS54 KAMA 042042
SVSAMA

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

TXC111-205-341-421-042115-
/O.CON.KAMA.SV.W.0183.000000T0000Z-210704T2115Z/
Sherman TX-Dallam TX-Moore TX-Hartley TX-
342 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHWESTERN SHERMAN...EASTERN DALLAM...NORTHWESTERN MOORE AND
NORTHEASTERN HARTLEY COUNTIES...

At 341 PM CDT, a severe thunderstorm was located 7 miles north of
Conlen, or 11 miles west of Stratford, 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...
Dalhart, Stratford, Cactus and Conlen. 

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 3650 10206 3621 10169 3598 10204 3591 10258
      3650 10267
TIME...MOT...LOC 2041Z 352DEG 7KT 3634 10229 

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

LG

185 
WWUS54 KAMA 042049
SVSAMA

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

TXC111-205-341-421-042115-
/O.CON.KAMA.SV.W.0183.000000T0000Z-210704T2115Z/
Sherman TX-Dallam TX-Moore TX-Hartley TX-
349 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHWESTERN SHERMAN...EASTERN DALLAM...NORTHWESTERN MOORE AND
NORTHEASTERN HARTLEY COUNTIES...

At 348 PM CDT, a severe thunderstorm was located 8 miles northwest of
Conlen, or 14 miles west of Stratford, moving south 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...
Dalhart, Stratford, Cactus and Conlen. 

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 3650 10206 3621 10169 3598 10204 3591 10258
      3650 10267
TIME...MOT...LOC 2048Z 011DEG 11KT 3633 10234 

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

LG

274 
WWUS54 KAMA 042057
SVSAMA

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

TXC111-205-341-421-042115-
/O.CON.KAMA.SV.W.0183.000000T0000Z-210704T2115Z/
Sherman TX-Dallam TX-Moore TX-Hartley TX-
357 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHWESTERN SHERMAN...EASTERN DALLAM...NORTHWESTERN MOORE AND
NORTHEASTERN HARTLEY COUNTIES...

At 357 PM CDT, a severe thunderstorm was located 6 miles northwest of
Conlen, or 13 miles west of Stratford, moving south at 15 mph.

HAZARD...70 mph wind gusts and ping pong ball size hail.

SOURCE...Radar indicated.

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...
Dalhart, Stratford, Cactus and Conlen. 

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 3650 10206 3621 10169 3598 10204 3591 10258
      3650 10256
TIME...MOT...LOC 2057Z 353DEG 12KT 3631 10231 

HAIL...1.50IN
WIND...70MPH
 
$$

LG

977 
WWUS54 KAMA 042106
SVSAMA

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

TXC111-205-341-421-042115-
/O.CON.KAMA.SV.W.0183.000000T0000Z-210704T2115Z/
Sherman TX-Dallam TX-Moore TX-Hartley TX-
406 PM CDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHWESTERN SHERMAN...EASTERN DALLAM...NORTHWESTERN MOORE AND
NORTHEASTERN HARTLEY COUNTIES...

At 406 PM CDT, a severe thunderstorm was located 6 miles northwest of
Conlen, or 15 miles west of Stratford, 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...
Dalhart, Stratford, Cactus and Conlen. 

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 3650 10206 3621 10169 3598 10204 3591 10258
      3650 10256
TIME...MOT...LOC 2106Z 018DEG 11KT 3628 10235 

HAIL...1.25IN
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, 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, 3:50 PM CDT	Areal Flood Advisory	AMA	Dallam	3 hr
Jul 4, 4:14 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Sherman	91 min
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, 6:20 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Sherman	85 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 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.