Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 209, NWS Amarillo, TX

July 17, 2021Gray County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 17, 2021, 3:48 PM CDT for Gray County, Texas. It was in force for 57 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 17, 2021, 3:48 PM CDT (20:48 UTC)
Expired: Jul 17, 2021, 4:45 PM CDT
In force: 57 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Gray County, TX

The radar

The Amarillo radar (KAMA), 94 km from the middle of the area, began a volume at 20:49 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, 8.8 hours before the alert went out and 93 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: 746 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1445 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

410 
WUUS54 KAMA 172048
SVRAMA
TXC179-172145-
/O.NEW.KAMA.SV.W.0209.210717T2048Z-210717T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
348 PM CDT Sat Jul 17 2021

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Northeastern Gray County in the Panhandle of Texas...

* Until 445 PM CDT.

* At 348 PM CDT, a severe thunderstorm was located over Lefors, or 13
  miles southeast of Pampa, moving east 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...
  Lefors.

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 3536 10080 3551 10084 3562 10054 3538 10054
TIME...MOT...LOC 2048Z 255DEG 12KT 3545 10075 

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

Guerrero

1 follow-up statement

849 
WWUS54 KAMA 172136 RRA
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
436 PM CDT Sat Jul 17 2021

TXC179-172146-
/O.EXP.KAMA.SV.W.0209.000000T0000Z-210717T2145Z/
Gray TX-
436 PM CDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GRAY COUNTY WILL
EXPIRE AT 445 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 3536 10080 3551 10084 3562 10054 3538 10054
TIME...MOT...LOC 2136Z 255DEG 12KT 3549 10057 

$$

Guerrero

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 7:47 PM CDT	Special Weather Statement	AMA	Oldham	28 min
Jul 16, 8:02 PM CDT	Severe Thunderstorm Warning	AMA	Hartley	24 min
Jul 16, 8:24 PM CDT	Special Weather Statement	AMA	Oldham	36 min
Jul 16, 8:26 PM CDT	Special Weather Statement	AMA	Hutchinson	34 min
Jul 17, 4:58 AM CDT	Special Weather Statement	AMA	Hansford	32 min
Jul 17, 5:33 AM CDT	Special Weather Statement	AMA	Hansford	27 min
Jul 17, 5:45 AM CDT	Severe Thunderstorm Warning	AMA	Hansford	30 min
Jul 17, 5:57 AM CDT	Areal Flood Advisory	AMA	Hansford	2 hr
Jul 17, 6:14 AM CDT	Special Weather Statement	AMA	Hansford	31 min
Jul 17, 2:30 PM CDT	Special Weather Statement	AMA	Sherman	60 min
Jul 17, 2:40 PM CDT	Areal Flood Advisory	AMA	Dallam	2 hr
Jul 17, 2:50 PM CDT	Special Weather Statement	AMA	Dallam	55 min
Jul 17, 3:00 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	60 min
Jul 17, 3:27 PM CDT	Special Weather Statement	AMA	Moore	63 min
Jul 17, 3:40 PM CDT	Special Weather Statement	AMA	Gray	65 min
Jul 17, 3:55 PM CDT	Areal Flood Advisory	AMA	Dallam, Hartley	105 min
Jul 17, 3:59 PM CDT	Special Weather Statement	AMA	Sherman	61 min
Jul 17, 4:02 PM CDT	Severe Thunderstorm Warning	AMA	Sherman	34 min
Jul 17, 4:46 PM CDT	Special Weather Statement	AMA	Wheeler	59 min
Jul 17, 4:52 PM CDT	Special Weather Statement	AMA	Armstrong	53 min
Jul 17, 4:56 PM CDT	Flash Flood Warning	AMA	Armstrong	98 min
Jul 17, 5:00 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong	43 min
Jul 17, 5:38 PM CDT	Special Weather Statement	AMA	Donley	37 min
Jul 17, 6:01 PM CDT	Severe Thunderstorm Warning	AMA	Donley	24 min
Jul 17, 6:23 PM CDT	Areal Flood Advisory	AMA	Potter, Randall	3 hr
Jul 17, 6:27 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Randall	63 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.