Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 269, NWS Amarillo, TX

September 7, 2021Hemphill County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Sep 7, 2021, 6:04 PM CDT for Hemphill County, Texas. It was in force for 29 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
Sep 7, 2021, 6:04 PM CDT (23:04 UTC)
Expired
Sep 7, 2021, 6:33 PM CDT
In force
29 min
Issued by
NWS Amarillo, TX
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Hemphill County, TX

The radar

The Amarillo radar (KAMA), 135 km from the middle of the area, began a volume at 23:05 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.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.1 hours before the alert went out and 135 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-pSkew-T log-p diagram, Amarillo Airport, TX at 12:00Z on 2021-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 785 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 12:00Z on 2021-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
785 J/kg
Mixed-layer CIN
-260 J/kg
Mixed-layer LCL
1879 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
139 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

487 
WUUS54 KAMA 072304
SVRAMA
TXC211-072345-
/O.NEW.KAMA.SV.W.0269.210907T2304Z-210907T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Amarillo TX
604 PM CDT Tue Sep 7 2021

The National Weather Service in Amarillo has issued a

* Severe Thunderstorm Warning for...
  Western Hemphill County in the Panhandle of Texas...

* Until 645 PM CDT.

* At 604 PM CDT, a severe thunderstorm was located over Canadian,
  moving south at 20 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...
  Canadian.

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 3571 10054 3601 10054 3599 10023 3572 10019
TIME...MOT...LOC 2304Z 355DEG 16KT 3593 10036 

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

$$

LFM
2 follow-up statements
024 
WWUS54 KAMA 072322
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
622 PM CDT Tue Sep 7 2021

TXC211-072345-
/O.CON.KAMA.SV.W.0269.000000T0000Z-210907T2345Z/
Hemphill TX-
622 PM CDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR SOUTHWESTERN HEMPHILL COUNTY...

At 622 PM CDT, a severe thunderstorm was located over Canadian,
moving south at 15 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to roofs, siding, and trees is possible.

Locations impacted include...
Canadian.

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 3571 10054 3597 10054 3593 10022 3572 10019
TIME...MOT...LOC 2322Z 351DEG 13KT 3588 10034 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

LFM
153 
WWUS54 KAMA 072333
SVSAMA

Severe Weather Statement
National Weather Service Amarillo TX
633 PM CDT Tue Sep 7 2021

TXC211-072343-
/O.CAN.KAMA.SV.W.0269.000000T0000Z-210907T2345Z/
Hemphill TX-
633 PM CDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HEMPHILL 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.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 3571 10054 3597 10054 3593 10022 3572 10019
TIME...MOT...LOC 2330Z 355DEG 16KT 3583 10033 

$$

LFM

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 7:54 PM CDTSpecial Weather StatementAMADallam51 min
Sep 6, 8:49 PM CDTSpecial Weather StatementAMAHartley41 min
Sep 6, 9:34 PM CDTSpecial Weather StatementAMAHartley, Oldham41 min

Nearby

Severe Thunderstorm Warnings in Texas, 2021Every 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.