Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 195, NWS Austin/San Antonio, TX

December 18, 2021Bandera County, Medina County, Uvalde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Dec 18, 2021, 10:21 AM CST for Bandera County, Medina County, Uvalde County, Texas. It was in force for 39 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, 10:21 AM CST (16:21 UTC)
Expired: Dec 18, 2021, 11:00 AM CST
In force: 39 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Bandera County, TX, Medina County, TX, Uvalde County, TX

The radar

The Laughlin AFB radar (KDFX), 87 km from the middle of the area, began a volume at 16:21 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

Del Rio, TX (KDRT), launched 12:00Z, 4.4 hours before the alert went out and 137 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: 1595 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 799 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: -0.3
Supercell composite: -2.0

Open this sounding in Storm Lab

The text

As transmitted.

407 
WUUS54 KEWX 181621
SVREWX
TXC019-325-463-181700-
/O.NEW.KEWX.SV.W.0195.211218T1621Z-211218T1700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
1021 AM CST Sat Dec 18 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northwestern Medina County in south central Texas...
  Southwestern Bandera County in south central Texas...
  Northeastern Uvalde County in south central Texas...

* Until 1100 AM CST.

* At 1021 AM CST, a severe thunderstorm was located near Utopia, or
  13 miles south of Vanderpool, moving east at 20 mph.

  HAZARD...Quarter size hail.

  SOURCE...Public.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Tarpley, Utopia and Hill Country State Natural Area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2944 9958 2961 9963 2974 9922 2947 9916
TIME...MOT...LOC 1621Z 258DEG 18KT 2955 9953 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

KCW

2 follow-up statements

459 
WWUS54 KEWX 181630
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
1030 AM CST Sat Dec 18 2021

TXC019-325-463-181700-
/O.CON.KEWX.SV.W.0195.000000T0000Z-211218T1700Z/
Medina TX-Bandera TX-Uvalde TX-
1030 AM CST Sat Dec 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM CST
FOR NORTHWESTERN MEDINA...SOUTHWESTERN BANDERA AND NORTHEASTERN
UVALDE COUNTIES...

At 1029 AM CST, a severe thunderstorm was located near Utopia, or 13
miles south of Vanderpool, moving east at 20 mph.

HAZARD...Golf ball size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Tarpley, Utopia and Hill Country State Natural Area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2944 9955 2963 9957 2974 9922 2947 9916
TIME...MOT...LOC 1629Z 258DEG 18KT 2956 9948 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

KCW

981 
WWUS54 KEWX 181642
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
1042 AM CST Sat Dec 18 2021

TXC463-181652-
/O.CAN.KEWX.SV.W.0195.000000T0000Z-211218T1700Z/
Uvalde TX-
1042 AM CST Sat Dec 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN UVALDE 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 2963 9941 2963 9942 2968 9942 2974 9922
      2947 9916 2945 9941
TIME...MOT...LOC 1642Z 257DEG 18KT 2958 9938 

$$

TXC019-325-181700-
/O.CON.KEWX.SV.W.0195.000000T0000Z-211218T1700Z/
Medina TX-Bandera TX-
1042 AM CST Sat Dec 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM CST
FOR NORTHWESTERN MEDINA AND SOUTHWESTERN BANDERA COUNTIES...

At 1042 AM CST, a severe thunderstorm was located 8 miles southwest
of Tarpley, moving east at 20 mph.

HAZARD...Golf ball size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Tarpley and Hill Country State Natural Area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2963 9941 2963 9942 2968 9942 2974 9922
      2947 9916 2945 9941
TIME...MOT...LOC 1642Z 257DEG 18KT 2958 9938 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

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, 10:25 AM CST	Severe Thunderstorm Warning	EWX	Gonzales, Guadalupe, Wilson	35 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.