Alert archive / Texas / Tornado Warnings in 2007

Tornado Warning 34, NWS Austin/San Antonio, TX

July 23, 2007Williamson County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at Jul 23, 2007, 6:59 PM CDT for Williamson County, Texas. It was in force for 35 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
Jul 23, 2007, 6:59 PM CDT (23:59 UTC)
Expired
Jul 23, 2007, 7:34 PM CDT
In force
35 min
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

County Williamson County, TX

The radar

The Ft Hood radar (KGRK), 18 km from the middle of the area, began a volume at 00:03 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

Fort Worth, TX (KFWD), launched 12:00Z, 12.0 hours before the alert went out and 229 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 12:00Z on 2007-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1147 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 12:00Z on 2007-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.1939Sfc1 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
1147 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
797 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KEWX 232358
TOREWX
TXC491-240045-
/O.NEW.KEWX.TO.W.0034.070723T2359Z-070724T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
659 PM CDT MON JUL 23 2007

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  WILLIAMSON COUNTY IN SOUTH CENTRAL TEXAS...
  THIS INCLUDES THE CITIES OF...SERENADA...GEORGETOWN...

* UNTIL 745 PM CDT

* AT 654 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE
  DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  JARRELL...OR ABOUT 10 MILES NORTHWEST OF GRANGER...MOVING SOUTHWEST
  AT 5 MPH.

* THE TORNADO WILL BE NEAR...
  JARRELL BY 720 PM CDT...
  7 MILES NORTH OF WEIR AND 7 MILES NORTHEAST OF SERENADA BY 745 PM
  CDT...

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.

LAT...LON 3084 9741 3095 9758 3072 9783 3056 9757

$$
3 follow-up statements
000 
WWUS54 KEWX 240007
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
707 PM CDT MON JUL 23 2007

TXC491-240045-
/O.CON.KEWX.TO.W.0034.000000T0000Z-070724T0045Z/
WILLIAMSON TX-
707 PM CDT MON JUL 23 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
WILLIAMSON COUNTY...

AT 703 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED JUST SOUTH OF 
JARRELL...OR ABOUT 9 MILES NORTHWEST OF GRANGER...MOVING SOUTHWEST 
AT 15 MPH.

THE TORNADO WILL BE NEAR...
  WEIR BY 730 PM CDT...
  SERENADA BY 735 PM CDT...
  GEORGETOWN AND GEORGETOWN DAM BY 745 PM CDT...

A VEHICLE IS EASILY ROLLED AND CRUSHED BY A TORNADO. DO NOT TRY TO
OUTRUN ONE. IF NO STRONG BUILDING IS CLOSE...LEAVE YOUR VEHICLE AND
TAKE SHELTER IN A DITCH OR LOW SPOT. COVER YOUR HEAD.

LAT...LON 3084 9741 3095 9758 3072 9783 3056 9757

$$
000 
WWUS54 KEWX 240022
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
720 PM CDT MON JUL 23 2007

TXC491-240045-
/O.CON.KEWX.TO.W.0034.000000T0000Z-070724T0045Z/
WILLIAMSON TX-
720 PM CDT MON JUL 23 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
WILLIAMSON COUNTY...

AT 718 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED 5 MILES SOUTHWEST OF 
BARTLETT...OR ABOUT 3 MILES WEST OF GRANGER...MOVING SOUTH AT 20 MPH.

THE TORNADO WILL BE NEAR...
  RURAL WILLIAMSON COUNTY AT 730 PM CDT

THIS STORM SHOWS SIGNS OF WEAKENING...BUT IT COULD STILL PRODUCE A 
BRIEF TORNADO AS IT MOVES TOWARDS TAYLOR.

LAT...LON 3084 9741 3095 9758 3072 9783 3056 9757

$$
000 
WWUS54 KEWX 240034
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
734 PM CDT MON JUL 23 2007

TXC491-240044-
/O.CAN.KEWX.TO.W.0034.000000T0000Z-070724T0045Z/
WILLIAMSON TX-
734 PM CDT MON JUL 23 2007

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

THUNDERSTORMS WITH HEAVY RAINFALL CONTINUE OVER WILLIAMSON 
COUNTY...BUT THE RADAR SIGNS OF A TORNADO HAVE VANISHED. FLASH 
FLOODING REMAINS LIKELY OVER PARTS OF WILLIAMSON COUNTY THIS 
EVENING. 

LAT...LON 3084 9741 3095 9758 3072 9783 3056 9757

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 4:56 PM CDTFlash Flood WarningEWXBexar2 hr
Jul 23, 5:25 PM CDTFlash Flood WarningEWXBurnet, Travis, Williamson3 hr
Jul 23, 5:42 PM CDTFlash Flood WarningEWXHays3 hr
Jul 23, 6:27 PM CDTFlash Flood WarningEWXComal, Guadalupe3 hr
Jul 23, 6:33 PM CDTFlash Flood WarningEWXBlanco, Kendall3 hr
Jul 23, 6:57 PM CDTSevere Thunderstorm WarningEWXComal, Guadalupe37 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.