Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 211, NWS Amarillo, TX

July 17, 2021Armstrong County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 17, 2021, 5:00 PM CDT for Armstrong County, Texas. It was in force for 43 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: Jul 17, 2021, 5:00 PM CDT (22:00 UTC)
Expired: Jul 17, 2021, 5:43 PM CDT
In force: 43 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Armstrong County, TX

The radar

The Amarillo radar (KAMA), 31 km from the middle of the area, began a volume at 22:05 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 17, 5:14 PM CDT	HAIL 1.75	3 Wsw Claude, TX	REPORTED MOSTLY QUARTER SIZE HAIL WITH A FEW STONES AS LARGE AS GOLF BALLS. SAID A COTTON FIELD TWO MILES TO THE WEST WAS COMPLETELY DESTROYED.

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, 10.0 hours before the alert went out and 30 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.

071 
WUUS54 KAMA 172200
SVRAMA
TXC011-172300-
/O.NEW.KAMA.SV.W.0211.210717T2200Z-210717T2300Z/

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

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Northwestern Armstrong County in the Panhandle of Texas...

* Until 600 PM CDT.

* At 500 PM CDT, a severe thunderstorm was located near Claude, and
  is nearly stationary.

  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. Hail may accumulate 
           on roadways causing hazardous travel.

* Locations impacted include...
  Claude.

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 3518 10142 3511 10127 3495 10134 3512 10158
TIME...MOT...LOC 2200Z 046DEG 4KT 3513 10141 

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

Guerrero

1 follow-up statement

605 
WWUS54 KAMA 172243
SVSAMA

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

TXC011-172253-
/O.CAN.KAMA.SV.W.0211.000000T0000Z-210717T2300Z/
Armstrong TX-
543 PM CDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ARMSTRONG COUNTY
IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

LAT...LON 3518 10142 3511 10127 3495 10134 3512 10158
TIME...MOT...LOC 2242Z 046DEG 4KT 3510 10145 

$$

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, 3:48 PM CDT	Severe Thunderstorm Warning	AMA	Gray	57 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, 5:38 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.