Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 196, NWS Austin/San Antonio, TX

December 18, 2021Gonzales County, Guadalupe County, Wilson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Dec 18, 2021, 10:25 AM CST for Gonzales County, Guadalupe County, Wilson County, Texas. It was in force for 35 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: Dec 18, 2021, 10:25 AM CST (16:25 UTC)
Expired: Dec 18, 2021, 11:00 AM CST
In force: 35 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Gonzales County, TX, Guadalupe County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 43 km from the middle of the area, began a volume at 16:24 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

Corpus Christi, TX (KCRP), launched 12:00Z, 4.4 hours before the alert went out and 186 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: 2358 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 531 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 5.5

Open this sounding in Storm Lab

The text

As transmitted.

893 
WUUS54 KEWX 181625
SVREWX
TXC177-187-493-181700-
/O.NEW.KEWX.SV.W.0196.211218T1625Z-211218T1700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
1025 AM CST Sat Dec 18 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Southeastern Guadalupe County in south central Texas...
  West central Gonzales County in south central Texas...
  Northeastern Wilson County in south central Texas...

* Until 1100 AM CST.

* At 1025 AM CST, a severe thunderstorm was located 7 miles northeast
  of Sutherland Springs, or 7 miles north of Stockdale, moving east
  at 25 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Public.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Stockdale, Nixon, Sutherland Springs, Leesville, Belmont, Bebe and
  Monthalia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

Large hail, damaging winds, and continuous cloud to ground lightning
are occurring with this storm. Move indoors immediately. Lightning is
one of nature's leading killers. Remember, if you can hear thunder,
you are close enough to be struck by lightning.

&&

LAT...LON 2921 9803 2940 9808 2956 9766 2933 9753
TIME...MOT...LOC 1625Z 250DEG 23KT 2935 9796 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

KCW

2 follow-up statements

300 
WWUS54 KEWX 181628
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
1028 AM CST Sat Dec 18 2021

TXC177-187-493-181700-
/O.CON.KEWX.SV.W.0196.000000T0000Z-211218T1700Z/
Guadalupe TX-Gonzales TX-Wilson TX-
1028 AM CST Sat Dec 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM CST
FOR SOUTHEASTERN GUADALUPE...WEST CENTRAL GONZALES AND NORTHEASTERN
WILSON COUNTIES...

At 1028 AM CST, a severe thunderstorm was located 8 miles north of
Stockdale, moving east at 25 mph.

HAZARD...Two inch hail.

SOURCE...Public.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

Locations impacted include...
Stockdale, Nixon, Sutherland Springs, Leesville, Belmont, Bebe and
Monthalia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 2921 9803 2940 9808 2956 9766 2933 9753
TIME...MOT...LOC 1628Z 250DEG 23KT 2936 9794 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

KCW

181 
WWUS54 KEWX 181651
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
1051 AM CST Sat Dec 18 2021

TXC177-187-493-181701-
/O.EXP.KEWX.SV.W.0196.000000T0000Z-211218T1700Z/
Guadalupe TX-Gonzales TX-Wilson TX-
1051 AM CST Sat Dec 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GUADALUPE...WEST
CENTRAL GONZALES AND NORTHEASTERN WILSON COUNTIES WILL EXPIRE AT 1100
AM CST...
                
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 will be allowed to expire.  However small hail
is still possible with this thunderstorm.

LAT...LON 2921 9803 2940 9808 2956 9766 2933 9753
TIME...MOT...LOC 1651Z 256DEG 31KT 2939 9770 

$$

KCW

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 18, 2:04 AM CST	Special Weather Statement	EWX	Williamson	41 min
Dec 18, 2:48 AM CST	Special Weather Statement	EWX	Williamson	42 min
Dec 18, 4:59 AM CST	Special Weather Statement	EWX	Williamson	16 min
Dec 18, 5:28 AM CST	Special Weather Statement	EWX	Burnet	47 min
Dec 18, 6:07 AM CST	Special Weather Statement	EWX	Burnet	53 min
Dec 18, 7:34 AM CST	Areal Flood Advisory	EWX	Travis, Williamson	3 hr
Dec 18, 8:14 AM CST	Special Weather Statement	EWX	Caldwell	46 min
Dec 18, 8:27 AM CST	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Hays, Travis	13 min
Dec 18, 9:11 AM CST	Special Weather Statement	EWX	Bexar	49 min
Dec 18, 9:30 AM CST	Special Weather Statement	EWX	Real	45 min
Dec 18, 9:55 AM CST	Special Weather Statement	EWX	Wilson	50 min
Dec 18, 10:03 AM CST	Special Weather Statement	EWX	Uvalde	42 min
Dec 18, 10:05 AM CST	Special Weather Statement	EWX	Kinney	40 min
Dec 18, 10:09 AM CST	Severe Thunderstorm Warning	EWX	Wilson	36 min
Dec 18, 10:21 AM CST	Severe Thunderstorm Warning	EWX	Bandera, Medina, Uvalde	39 min
Dec 18, 10:49 AM CST	Severe Thunderstorm Warning	EWX	Bandera, Medina	41 min
Dec 18, 12:20 PM CST	Special Weather Statement	EWX	Goliad	40 min
Dec 18, 12:38 PM CST	Special Weather Statement	EWX	DeWitt	52 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.