Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 13, NWS Austin/San Antonio, TX

May 21, 2011Burnet County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at May 21, 2011, 8:44 PM CDT for Burnet County, Texas. It was in force for 31 min. 4 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, 8:44 PM CDT (01:44 UTC)
Expired: May 21, 2011, 9:15 PM CDT
In force: 31 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Burnet County, TX

The radar

The Ft Hood radar (KGRK), 72 km from the middle of the area, began a volume at 01:43 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 21, 8:48 PM CDT	HAIL 2.75	Burnet, TX
May 21, 8:53 PM CDT	HAIL 2	Burnet, TX	MEASURED HAIL WITH 2.38 INCHES ACROSS.
May 21, 8:59 PM CDT	HAIL 1.75	Burnet, TX
May 21, 9:24 PM CDT	HAIL 1	1 N Bertram, TX

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 21, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.7 hours before the alert went out and 242 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: 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.

146 
WFUS54 KEWX 220144
TOREWX
TXC053-220215-
/O.NEW.KEWX.TO.W.0013.110522T0144Z-110522T0215Z/

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

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL BURNET COUNTY...

* UNTIL 915 PM CDT.

* AT 843 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR BURNET...MOVING
  EAST AT 15 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE OATMEAL AND BERTRAM.

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 3079 9803 3069 9809 3077 9828 3084 9823
TIME...MOT...LOC 0145Z 289DEG 14KT 3076 9820

$$

1 follow-up statement

176 
WWUS54 KEWX 220212
SVSEWX

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

TXC053-220215-
/O.CON.KEWX.TO.W.0013.000000T0000Z-110522T0215Z/
BURNET TX-
912 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR CENTRAL
BURNET COUNTY...

AT 911 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A TORNADO. 
THIS TORNADO WAS LOCATED SEVERAL MILES EAST OF BERTRAM...MOVING EAST 
AT 15 MPH.

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.

&&

LAT...LON 3075 9817 3079 9815 3079 9803 3072 9807
TIME...MOT...LOC 0212Z 272DEG 13KT 3077 9812

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 7:10 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Travis, Williamson	50 min
May 21, 7:27 PM CDT	Tornado Warning	EWX	Burnet, Williamson	33 min
May 21, 7:44 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Williamson	46 min
May 21, 7:50 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	40 min
May 21, 7:59 PM CDT	Tornado Warning	EWX	Burnet, Williamson	31 min
May 21, 8:08 PM CDT	Areal Flood Advisory	EWX	Burnet, Williamson	112 min
May 21, 8:11 PM CDT	Tornado Warning	EWX	Burnet, Llano	34 min
May 21, 8:27 PM CDT	Severe Thunderstorm Warning	EWX	Williamson	48 min
May 21, 8:27 PM CDT	Tornado Warning	EWX	Williamson	33 min
May 21, 8:32 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	43 min
May 21, 8:59 PM CDT	Tornado Warning	EWX	Williamson	31 min
May 21, 9:14 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Williamson	46 min

Nearby

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