Alert archive / Texas / Tornado Warnings in 2007

Tornado Warning 1, NWS Austin/San Antonio, TX

March 11, 2007Blanco County, Gillespie County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at Mar 11, 2007, 6:42 PM CDT for Blanco County, Gillespie County, Texas. It was in force for 33 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
Mar 11, 2007, 6:42 PM CDT (23:42 UTC)
Expired
Mar 11, 2007, 7:15 PM CDT
In force
33 min
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

Counties Blanco County, TX, Gillespie County, TX

The radar

The Austin/San Antonio radar (KEWX), 95 km from the middle of the area, began a volume at 23:44 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 watch it was issued in

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

IssuedProductOfficeLasted
Mar 11, 5:16 PM CDTTornado WatchSPC8 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.7 hours before the alert went out and 257 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, Del Rio, TX at 12:00Z on 2007-03-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 449 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, Del Rio, TX at 12:00Z on 2007-03-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 square meters per square second.1939587897Sfc1 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
449 J/kg
Mixed-layer CIN
-247 J/kg
Mixed-layer LCL
575 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KEWX 112342
TOREWX
TXC031-171-120015-
/O.NEW.KEWX.TO.W.0001.070311T2342Z-070312T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
642 PM CDT SUN MAR 11 2007

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR THE FOLLOWING COUNTIES...
  GILLESPIE
  BLANCO

* UNTIL 715 PM CDT

* AT 640 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 17
  MILES WEST OF ROUND MOUNTAIN...MOVING EAST AT 15 MPH.

WILLOW CITY WILL BE AFFECTED BY THIS STORM THROUGH 7 PM.

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 TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SUNDAY EVENING FOR
SOUTH CENTRAL TEXAS. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL 100
AM CDT MONDAY MORNING FOR SOUTH CENTRAL TEXAS.

LAT...LON 3051 9870 3038 9867 3034 9826 3047 9827
      3050 9837 3051 9845

$$
2 follow-up statements
000 
WWUS54 KEWX 112352
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
649 PM CDT SUN MAR 11 2007

TXC031-171-120015-
/O.CON.KEWX.TO.W.0001.000000T0000Z-070312T0015Z/
GILLESPIE TX-BLANCO TX-
649 PM CDT SUN MAR 11 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR BLANCO
AND GILLESPIE COUNTIES...

AT 648 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A TORNADO.  THIS TORNADO WAS LOCATED 14 MILES WEST OF ROUND
MOUNTAIN...MOVING EAST AT 15 MPH.

THE TORNADO WILL APPROACH THE TOWN OF ROUND MOUNTAIN BY 715 PM. 
PEOPLE NEAR AND TO THE WEST OF ROUND MOUNTAIN CAN ALSO EXPECT LARGE 
HAIL UP TO QUARTER SIZE AND WIND GUSTS IN EXCESS OF 60 MPH. THIS 
DANGEROUS THUNDERSTORMS WILL MOVE OUT OF GILLESPIE COUNTY BY 705 PM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SUNDAY EVENING FOR
SOUTH CENTRAL TEXAS. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL 100
AM CDT MONDAY MORNING FOR SOUTH CENTRAL TEXAS.

LAT...LON 3051 9870 3038 9867 3034 9826 3047 9827
      3050 9837 3051 9845

$$
000 
WWUS54 KEWX 120001
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
659 PM CDT SUN MAR 11 2007

TXC171-120009-
/O.CAN.KEWX.TO.W.0001.000000T0000Z-070312T0015Z/
GILLESPIE TX-
659 PM CDT SUN MAR 11 2007

...THE TORNADO WARNING FOR GILLESPIE COUNTY IS CANCELLED...

THE THUNDERSTORM WHICH PROMPTED THE TORNADO WARNING HAS SINCE MOVED 
EAST INTO BLANCO COUNTY. A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 
PM CDT SUNDAY EVENING FOR SOUTH CENTRAL TEXAS. A TORNADO WATCH ALSO 
REMAINS IN EFFECT UNTIL 100 AM CDT MONDAY MORNING FOR SOUTH CENTRAL 
TEXAS.

LAT...LON 3050 9837 3050 9834 3048 9830 3048 9828
      3044 9826 3036 9826 3038 9858 3051 9858
      3051 9838

$$

TXC031-120015-
/O.CON.KEWX.TO.W.0001.000000T0000Z-070312T0015Z/
BLANCO TX-
659 PM CDT SUN MAR 11 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR BLANCO
COUNTY...

AT 657 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A TORNADO.  THIS TORNADO WAS LOCATED 11 MILES WEST OF ROUND
MOUNTAIN...MOVING EAST AT 15 MPH.

THE TORNADO WILL BE NEAR...
  ROUND MOUNTAIN BY 715 PM CDT

THIS THUNDERSTORM MAY ALSO PRODUCE HAIL UP TO QUARTER SIZE AND WIND 
GUSTS IN EXCESS OF 60 MPH.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SUNDAY EVENING FOR
SOUTH CENTRAL TEXAS. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL 100
AM CDT MONDAY MORNING FOR SOUTH CENTRAL TEXAS.

LAT...LON 3050 9837 3050 9834 3048 9830 3048 9828
      3044 9826 3036 9826 3038 9858 3051 9858
      3051 9838

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 11, 5:56 PM CDTSevere Thunderstorm WarningEWXKerr28 min

Nearby

Tornado Warnings in Texas, 2007Every tornado warning in 2007Tornadoes in 2007

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.