Alert archive / Texas / Tornado Warnings in 2008

Tornado Warning 9, NWS Austin/San Antonio, TX

April 25, 2008Williamson County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at Apr 25, 2008, 6:55 PM CDT for Williamson County, Texas. It was in force for 50 min. 1 report 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
Apr 25, 2008, 6:55 PM CDT (23:55 UTC)
Expired
Apr 25, 2008, 7:45 PM CDT
In force
50 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

County Williamson County, TX

The radar

The Ft Hood radar (KGRK), 10 km from the middle of the area, began a volume at 23:56 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
Apr 25, 7:28 PM CDTHAIL 1.756 E Jarrell, TXGOLFBALL SIZE HAIL AT SCHWERTNER

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
Apr 25, 5:32 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.9 hours before the alert went out and 228 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 2008-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1802 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 2008-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 280 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
1802 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
545 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
280 m²/s²
0-3 km storm-relative helicity
387 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.2

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KEWX 252355
TOREWX
TXC491-260045-
/O.NEW.KEWX.TO.W.0009.080425T2355Z-080426T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
655 PM CDT FRI APR 25 2008

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL WILLIAMSON COUNTY...

* UNTIL 745 PM CDT.

* AT 652 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 9 MILES NORTH OF
  BARTLETT...OR ABOUT 11 MILES SOUTH OF BELTON...MOVING SOUTH AT 19
  MPH.

* THE TORNADO WILL BE NEAR...
  7 MILES EAST OF JARRELL BY 710 PM CDT...
  BARTLETT BY 720 PM CDT...
  GRANGER BY 735 PM CDT...
  8 MILES WEST OF GRANGER DAM BY 740 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 3083 9748 3081 9745 3081 9742 3080 9739
      3079 9735 3077 9734 3065 9731 3069 9765
      3088 9762
TIME...MOT...LOC 2355Z 356DEG 17KT 3090 9748

$$
2 follow-up statements
000 
WWUS54 KEWX 260009
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
706 PM CDT FRI APR 25 2008

TXC491-260045-
/O.CON.KEWX.TO.W.0009.000000T0000Z-080426T0045Z/
WILLIAMSON TX-
706 PM CDT FRI APR 25 2008

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

AT 700 PM CDT...THE TORNADIC THUNDERSTORM WAS CROSSING THE BELL AND 
WILLIAMSON COUNTY LINE...MOVING SOUTH AT 20 MPH. GOLFBALL TO 
BASEBALL SIZE HAIL AS BEEN REPORTED WITH THIS STORM ACROSS BELL 
COUNTY. 

THE TORNADO WILL BE NEAR...
  SCHWERTNER BY 710 PM CDT...
  BARTLETT AND 8 MILES EAST OF THEON BY 720 PM CDT...
  GRANGER BY 735 PM CDT...

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 1100 PM CDT
FRIDAY EVENING FOR SOUTH CENTRAL TEXAS.

LAT...LON 3083 9748 3081 9745 3081 9742 3080 9739
      3079 9735 3077 9734 3065 9731 3069 9765
      3088 9762
TIME...MOT...LOC 0006Z 356DEG 17KT 3085 9748

$$
000 
WWUS54 KEWX 260036 RRA
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
735 PM CDT FRI APR 25 2008

TXC491-260045-
/O.CON.KEWX.TO.W.0009.000000T0000Z-080426T0045Z/
WILLIAMSON TX-
735 PM CDT FRI APR 25 2008

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

AT 730 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE 
THUNDERSTORM WITH STRONG ROTATION...CAPABLE OF PRODUCING A TORNADO.  
THIS POSSIBLE TORNADO WAS LOCATED NEAR SCHWERTNER...OR 6 MILES 
NORTHWEST OF GRANGER...MOVING SOUTH AT 20 MPH. THIS DANGEROUS STORM 
WILL PRODUCE HAIL TO THE SIZE OF GOLFBALLS...OR LARGER...WITH 
DAMAGING WINDS IN EXCESS OF 60 MPH. 

THE TORNADO WILL BE NEAR...
  WALBURG BY 740 PM CDT...
  GRANGER 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
FRIDAY EVENING FOR SOUTH CENTRAL TEXAS.

LAT...LON 3083 9748 3081 9745 3081 9742 3080 9739
      3079 9735 3077 9734 3065 9731 3069 9765
      3088 9762
TIME...MOT...LOC 0035Z 356DEG 17KT 3077 9750

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 25, 5:39 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano40 min
Apr 25, 6:15 PM CDTSevere Thunderstorm WarningEWXGillespie60 min

Nearby

Tornado Warnings in Texas, 2008Every tornado warning in 2008Tornadoes in 2008

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.