Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 123, NWS Austin/San Antonio, TX

May 11, 2021Travis County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 11, 2021, 8:48 PM CDT for Travis County, Texas. It was in force for 26 min. 2 reports 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: May 11, 2021, 8:48 PM CDT (01:48 UTC)
Expired: May 11, 2021, 9:14 PM CDT
In force: 26 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Travis County, TX

The radar

The Ft Hood radar (KGRK), 70 km from the middle of the area, began a volume at 01:49 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.

What was reported inside it

Time	Report	Where	Remark
May 11, 8:57 PM CDT	HAIL 0.5	2 Sw Point Venture, TX	REPORT FROM MPING. HALF-INCH (0.50 IN.).
May 11, 9:10 PM CDT	HAIL 1	2 S Lago Vista, TX	BROADCAST MEDIA RELAYED A VIEWER REPORT OF 1 INCH HAIL IN LAGO VISTA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 11, 3:41 PM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.8 hours before the alert went out and 274 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

553 
WUUS54 KEWX 120148
SVREWX
TXC453-120245-
/O.NEW.KEWX.SV.W.0123.210512T0148Z-210512T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
848 PM CDT Tue May 11 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northwestern Travis County in south central Texas...

* Until 945 PM CDT.

* At 848 PM CDT, a severe thunderstorm was located 7 miles southeast
  of Spicewood, or 12 miles north of Dripping Springs, moving
  northeast at 25 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Austin, Lakeway, Lago Vista, Bee Cave, Hudson Bend, The Hills, 
  Mansfield Dam, Jonestown, Briarcliff, Point Venture, Volente and 
  State Highway 71.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3043 9780 3027 9805 3036 9817 3040 9815
      3046 9810 3049 9810 3049 9811 3050 9812
      3056 9809 3062 9805
TIME...MOT...LOC 0148Z 229DEG 20KT 3038 9811 

HAIL...1.00IN
WIND...<50MPH
 
$$

PLATT

2 follow-up statements

325 
WWUS54 KEWX 120201
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
901 PM CDT Tue May 11 2021

TXC453-120245-
/O.CON.KEWX.SV.W.0123.000000T0000Z-210512T0245Z/
Travis TX-
901 PM CDT Tue May 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR NORTHWESTERN TRAVIS COUNTY...

At 900 PM CDT, a severe thunderstorm was located near Briarcliff, or 
13 miles west of Anderson Mill, moving northeast at 25 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Austin, Lakeway, Lago Vista, Bee Cave, Hudson Bend, The Hills,
Mansfield Dam, Jonestown, Briarcliff, Point Venture and Volente.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3043 9780 3031 9800 3037 9810 3041 9813
      3046 9810 3049 9810 3049 9811 3050 9812
      3056 9809 3062 9805
TIME...MOT...LOC 0200Z 236DEG 20KT 3041 9803 

HAIL...1.00IN
WIND...<50MPH
 
$$

PLATT

977 
WWUS54 KEWX 120214
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
914 PM CDT Tue May 11 2021

TXC453-120224-
/O.CAN.KEWX.SV.W.0123.000000T0000Z-210512T0245Z/
Travis TX-
914 PM CDT Tue May 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TRAVIS 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, small hail and 
heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Texas.

LAT...LON 3043 9780 3031 9800 3037 9810 3041 9813
      3046 9810 3049 9810 3049 9811 3050 9812
      3056 9809 3062 9805
TIME...MOT...LOC 0211Z 229DEG 20KT 3046 9796 

$$

PLATT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 7:07 PM CDT	Special Weather Statement	EWX	Comal, Kendall	38 min
May 11, 7:10 PM CDT	Areal Flood Advisory	EWX	Dimmit, Frio, Zavala	3 hr
May 11, 7:15 PM CDT	Areal Flood Advisory	EWX	Bandera, Bexar, Comal, Kendall, Medina	3 hr
May 11, 7:24 PM CDT	Special Weather Statement	EWX	Blanco	51 min
May 11, 7:31 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Kendall	25 min
May 11, 7:34 PM CDT	Special Weather Statement	EWX	Lavaca	41 min
May 11, 8:10 PM CDT	Special Weather Statement	EWX	Blanco	50 min
May 11, 8:37 PM CDT	Areal Flood Advisory	EWX	Atascosa	3 hr
May 11, 8:43 PM CDT	Special Weather Statement	EWX	Travis	47 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.