Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 255, NWS Amarillo, TX

August 16, 2021Gray County, Roberts County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Aug 16, 2021, 1:42 PM CDT for Gray County, Roberts County, Texas. It was in force for 63 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 16, 2021, 1:42 PM CDT (18:42 UTC)
Expired: Aug 16, 2021, 2:45 PM CDT
In force: 63 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Gray County, TX, Roberts County, TX

The radar

The Amarillo radar (KAMA), 81 km from the middle of the area, began a volume at 18:43 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 16, 1:57 PM CDT	TSTM WND GST 58	5 Nnw Pampa, TX	AWOS STATION KPPA PAMPA.

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, 6.7 hours before the alert went out and 81 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: 894 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1213 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

433 
WUUS54 KAMA 161842
SVRAMA
TXC179-393-161945-
/O.NEW.KAMA.SV.W.0255.210816T1842Z-210816T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
142 PM CDT Mon Aug 16 2021

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Northwestern Gray County in the Panhandle of Texas...
  Southwestern Roberts County in the Panhandle of Texas...

* Until 245 PM CDT.

* At 142 PM CDT, a severe thunderstorm was located 8 miles north of
  Pampa, moving south 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...
  Pampa.

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 3552 10077 3552 10109 3563 10109 3571 10106
      3572 10082
TIME...MOT...LOC 1842Z 005DEG 6KT 3566 10101 

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

$$

MJG

1 follow-up statement

855 
WWUS54 KAMA 161930
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
230 PM CDT Mon Aug 16 2021

TXC393-161939-
/O.CAN.KAMA.SV.W.0255.000000T0000Z-210816T1945Z/
Roberts TX-
230 PM CDT Mon Aug 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ROBERTS 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 3552 10090 3552 10109 3562 10109 3562 10100
      3561 10090
TIME...MOT...LOC 1929Z 005DEG 6KT 3558 10102 

$$

TXC179-161945-
/O.CON.KAMA.SV.W.0255.000000T0000Z-210816T1945Z/
Gray TX-
230 PM CDT Mon Aug 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM CDT
FOR NORTHWESTERN GRAY COUNTY...

At 229 PM CDT, a severe thunderstorm was located near Pampa, moving
southwest at 15 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...
Pampa.

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 3552 10090 3552 10109 3562 10109 3562 10100
      3561 10090
TIME...MOT...LOC 1929Z 005DEG 6KT 3558 10102 

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

$$

MJG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 7:21 AM CDT	Areal Flood Advisory	AMA	Gray, Roberts	3 hr
Aug 16, 7:25 AM CDT	Special Weather Statement	AMA	Roberts	35 min
Aug 16, 10:02 AM CDT	Areal Flood Advisory	AMA	Lipscomb	118 min
Aug 16, 10:43 AM CDT	Special Weather Statement	AMA	Ochiltree	32 min
Aug 16, 12:39 PM CDT	Severe Thunderstorm Warning	AMA	Roberts	66 min
Aug 16, 12:57 PM CDT	Special Weather Statement	AMA	Hutchinson	33 min
Aug 16, 1:11 PM CDT	Tornado Warning	AMA	Roberts	34 min
Aug 16, 1:28 PM CDT	Special Weather Statement	AMA	Oldham	32 min
Aug 16, 1:54 PM CDT	Areal Flood Advisory	AMA	Gray	39 min
Aug 16, 2:09 PM CDT	Severe Thunderstorm Warning	AMA	Carson, Gray	51 min
Aug 16, 2:24 PM CDT	Special Weather Statement	AMA	Moore	36 min
Aug 16, 2:33 PM CDT	Flash Flood Warning	AMA	Gray, Roberts	2 hr
Aug 16, 2:54 PM CDT	Severe Thunderstorm Warning Considerable damage threat	AMA	Carson, Gray	51 min
Aug 16, 3:18 PM CDT	Severe Thunderstorm Warning Considerable damage threat	AMA	Donley, Gray	57 min
Aug 16, 3:30 PM CDT	Areal Flood Advisory	AMA	Armstrong, Carson	3 hr
Aug 16, 4:12 PM CDT	Special Weather Statement	AMA	Donley	33 min
Aug 16, 4:24 PM CDT	Areal Flood Advisory	AMA	Randall	3 hr
Aug 16, 4:29 PM CDT	Areal Flood Advisory	AMA	Deaf Smith, Oldham	3 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.