Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 11, NWS Austin/San Antonio, TX

May 21, 2011Burnet County, Llano County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at May 21, 2011, 8:11 PM CDT for Burnet County, Llano County, Texas. It was in force for 34 min. 8 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 21, 2011, 8:11 PM CDT (01:11 UTC)
Expired
May 21, 2011, 8:45 PM CDT
In force
34 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

Counties Burnet County, TX, Llano County, TX

The radar

The Ft Hood radar (KGRK), 83 km from the middle of the area, began a volume at 01:11 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

TimeReportWhereRemark
May 21, 8:30 PM CDTHAIL 1.55 Nw Burnet, TX
May 21, 8:36 PM CDTFUNNEL CLOUDBurnet, TXWALL CLOUD WITH ROTATION IN THE CITY OF BURNET.
May 21, 8:36 PM CDTHAIL 2.75Burnet, TXBASEBALL HAIL IN THE CITY OF BURNET.
May 21, 8:36 PM CDTHAIL 4Burnet, TXGRAPEFRUIT SIZE HAIL FALLING IN NORTH CENTRAL BURNET.
May 21, 8:40 PM CDTHAIL 4.5Burnet, TX5 INCH HAIL MEASURED.
May 21, 8:42 PM CDTHAIL 2.752 N Burnet, TXGOLFBALL TO BASEBALL SIZE HAIL NEAR BURNET.
May 21, 8:48 PM CDTHAIL 2.75Burnet, TX
May 21, 8:53 PM CDTHAIL 2Burnet, TXMEASURED HAIL WITH 2.38 INCHES ACROSS.

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.

IssuedProductOfficeLasted
May 21, 1:45 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.2 hours before the alert went out and 239 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, Fort Worth, TX at 00:00Z on 2011-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3908 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2011-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 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
3908 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
978 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
3.2
Supercell composite
16.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

204 
WFUS54 KEWX 220111
TOREWX
TXC053-299-220145-
/O.NEW.KEWX.TO.W.0011.110522T0111Z-110522T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
811 PM CDT SAT MAY 21 2011

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL BURNET COUNTY...
  EXTREME NORTHEASTERN LLANO COUNTY...

* UNTIL 845 PM CDT.

* AT 806 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 9 MILES NORTHWEST OF
  BURNET...OR ABOUT NEAR BUCHANAN DAM...MOVING EAST AT 20 MPH.

* THE TORNADO WILL MOVE NORTH OF HIGHWAY 29 TOWARD BURNET.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN A MOBILE HOME OR VEHICLE...GET OUT AND GO TO A STURDY
SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH
OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT
SATURDAY EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 3087 9810 3074 9821 3082 9842 3090 9838
TIME...MOT...LOC 0110Z 286DEG 18KT 3082 9834

$$
2 follow-up statements
374 
WWUS54 KEWX 220124
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
824 PM CDT SAT MAY 21 2011

TXC299-220133-
/O.CAN.KEWX.TO.W.0011.000000T0000Z-110522T0145Z/
LLANO TX-
824 PM CDT SAT MAY 21 2011

...THE TORNADO WARNING FOR EXTREME NORTHEASTERN LLANO COUNTY IS
CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT
SATURDAY EVENING FOR SOUTH CENTRAL TEXAS.

LAT...LON 3084 9830 3082 9815 3074 9821 3080 9836
TIME...MOT...LOC 0123Z 294DEG 18KT 3078 9827

$$

TXC053-220145-
/O.CON.KEWX.TO.W.0011.000000T0000Z-110522T0145Z/
BURNET TX-
824 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR CENTRAL
BURNET COUNTY...

AT 820 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A TORNADO. 
THIS TORNADO WAS LOCATED NEAR BURNET...MOVING SOUTHEAST AT 20 MPH.

RESIDENTS IN BURNET SHOULD TAKE COVER NOW!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN A MOBILE HOME OR VEHICLE...GET OUT AND GO TO A STURDY
SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH
OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT
SATURDAY EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 3084 9830 3082 9815 3074 9821 3080 9836
TIME...MOT...LOC 0123Z 294DEG 18KT 3078 9827

$$
201 
WWUS54 KEWX 220130
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
830 PM CDT SAT MAY 21 2011

TXC053-220145-
/O.CON.KEWX.TO.W.0011.000000T0000Z-110522T0145Z/
BURNET TX-
830 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR CENTRAL
BURNET COUNTY...

AT 824 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A TORNADO. 
THIS TORNADO WAS LOCATED NEAR BURNET...MOVING SOUTHEAST AT 20 MPH.

RESIDENTS IN BURNET SHOULD TAKE SHELTER IMMEDIATELY AND PREPARE FOR 
LARGE HAIL AND A POSSIBLE TORNADO!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS ON THE LOWEST FLOOR OF A
BUILDING IN AN INTERIOR HALLWAY...BATHROOM...OR CLOSET. COVER
YOURSELF WITH BLANKETS...PILLOWS OR EVEN A MATTRESS FOR BETTER
PROTECTION.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT
SATURDAY EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 3084 9830 3082 9815 3074 9821 3080 9836
TIME...MOT...LOC 0129Z 294DEG 18KT 3077 9824

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 7:10 PM CDTSevere Thunderstorm WarningEWXBurnet, Travis, Williamson50 min
May 21, 7:27 PM CDTTornado WarningEWXBurnet, Williamson33 min
May 21, 7:44 PM CDTSevere Thunderstorm WarningEWXBurnet, Williamson46 min
May 21, 7:50 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano40 min
May 21, 7:59 PM CDTTornado WarningEWXBurnet, Williamson31 min
May 21, 8:08 PM CDTAreal Flood AdvisoryEWXBurnet, Williamson112 min
May 21, 8:27 PM CDTSevere Thunderstorm WarningEWXWilliamson48 min
May 21, 8:27 PM CDTTornado WarningEWXWilliamson33 min
May 21, 8:32 PM CDTSevere Thunderstorm WarningEWXBurnet43 min
May 21, 8:44 PM CDTTornado WarningEWXBurnet31 min
May 21, 8:59 PM CDTTornado WarningEWXWilliamson31 min
May 21, 9:14 PM CDTSevere Thunderstorm WarningEWXBurnet, Williamson46 min

Nearby

Tornado Warnings in Texas, 2011Every tornado warning in 2011Tornadoes in 2011

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.