Alert archive / Texas / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 91, NWS Austin/San Antonio, TX

April 11, 2005Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 11, 2005, 1:14 AM CDT for Williamson County, Texas. It was in force for 61 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: Apr 11, 2005, 1:14 AM CDT (06:14 UTC)
Expired: Apr 11, 2005, 2:15 AM CDT
In force: 61 min
Issued by: NWS Austin/San Antonio, TX
Area: Counties, with a storm outline in the text

County Williamson County, TX

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 10, 10:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 6.2 hours before the alert went out and 252 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: 942 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 808 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 110614 RRA
SVREWX
TXC491-110715-
/O.NEW.KEWX.SV.W.0091.050411T0614Z-050411T0715Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
114 AM CDT MON APR 11 2005

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES...
  WILLIAMSON

* UNTIL 215 AM CDT

* AT 105 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 20 MILES SOUTHWEST OF ROUND ROCK...AND MOVING
  NORTHEAST AT 40 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE HUTTO...WEIR...TAYLOR...
  GRANGER...THRALL...BARTLETT AND GRANGER DAM.

LAT...LON 3049 9744 3048 9754 3051 9759 3049 9768
      3044 9777 3047 9784 3080 9743 3076 9732
      3073 9727 3062 9723

$$

4 follow-up statements

000 
WWUS54 KEWX 110626
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
126 AM CDT MON APR 11 2005

TXC491-110715-
/O.CON.KEWX.SV.W.0091.000000T0000Z-050411T0715Z/
WILLIAMSON TX-
126 AM CDT MON APR 11 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 215 AM CDT FOR
WILLIAMSON COUNTY...

AT 122 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR JOLLYVILLE...OR ABOUT NEAR
ANDERSON MILL...MOVING NORTHEAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BRUSHY CREEK BY 130 AM CDT
  ROUND ROCK BY 135 AM CDT
  HUTTO BY 145 AM CDT
  GRANGER BY 205 AM CDT
  BARTLETT AND GRANGER DAM BY 210 AM CDT

LAT...LON 3049 9744 3048 9754 3051 9759 3049 9768
      3044 9777 3047 9784 3080 9743 3076 9732
      3073 9727 3062 9723

$$

000 
WWUS54 KEWX 110646
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
146 AM CDT MON APR 11 2005

TXC491-110715-
/O.CON.KEWX.SV.W.0091.000000T0000Z-050411T0715Z/
WILLIAMSON TX-
146 AM CDT MON APR 11 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 215 AM CDT FOR
WILLIAMSON COUNTY...

AT 144 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR HUTTO...OR ABOUT 7 MILES NORTHEAST
OF ROUND ROCK...MOVING NORTHEAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES NORTHWEST OF TAYLOR BY 155 AM CDT
  GRANGER BY 200 AM CDT
  GRANGER DAM BY 205 AM CDT
  7 MILES SOUTHEAST OF BARTLETT BY 210 AM CDT

LAT...LON 3049 9744 3048 9754 3051 9759 3049 9768
      3044 9777 3047 9784 3080 9743 3076 9732
      3073 9727 3062 9723

$$

000 
WWUS54 KEWX 110659
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
159 AM CDT MON APR 11 2005

TXC491-110715-
/O.CON.KEWX.SV.W.0091.000000T0000Z-050411T0715Z/
WILLIAMSON TX-
159 AM CDT MON APR 11 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 215 AM CDT FOR
WILLIAMSON COUNTY...

AT 157 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DIME SIZE HAIL. 
THIS STORM WAS LOCATED NEAR GRANGER...MOVING NORTHEAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BARTLETT BY 210 AM CDT

LAT...LON 3049 9744 3048 9754 3051 9759 3049 9768
      3044 9777 3047 9784 3080 9743 3076 9732
      3073 9727 3062 9723

$$

000 
WWUS54 KEWX 110715
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
215 AM CDT MON APR 11 2005

TXC491-110724-
/O.EXP.KEWX.SV.W.0091.000000T0000Z-050411T0715Z/
WILLIAMSON TX-
215 AM CDT MON APR 11 2005

...THE SEVERE THUNDERSTORM WARNING FOR WILLIAMSON COUNTY EXPIRED AT
215 AM CDT...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LEVELS AS IT MOVED 
NORTHEAST OUT OF WILLIAMSON COUNTY. AS A RESULT...THE SEVERE 
THUNDERSTORM WARNING FOR WILLIAMSON COUNTY WAS LEFT TO EXPIRE AT 
215 AM CDT.  

LAT...LON 3049 9744 3048 9754 3051 9759 3049 9768
      3044 9777 3047 9784 3080 9743 3076 9732
      3073 9727 3062 9723

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 10, 11:00 PM CDT, 2 hours 14 minutes earlier.

Area forecast discussion, Apr 10, 11:00 PM CDT, 2 hours 14 minutes before

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
11 PM CDT SUN APR 10 2005

.UPDATE...SEVERE THUNDERSTORM WATCH #143 HAS BEEN REPLACED WITH
SEVERE THUNDERSTORM WATCH #148...COVERING MOST OF SOUTH CENTRAL
TEXAS AND SOME EXTREME EASTERN HILL COUNTRY COUNTIES. OTHERWISE,
FORECAST TEMPS AND WINDS ARE PROGRESSING ALONG WITHOUT PROBLEMS.

&&

.PREVIOUS DISCUSSION...
A SEVERE THUNDERSTORM WATCH AND LAST MINUTE NEED FOR A RED FLAG
WARNING DELAYED THIS DISCUSSION SLIGHTLY...SORRY FOR ANY
INCONVENIENCE. STORMS ARE FIRING CLOSE TO THE TIME AND LOCATION
SUGGESTED BY THE HIGHER RESOLUTION ETA MODEL RUNS. WITH A FEW
ISOLATED STORMS FORMING TO THE WEST WE COLLABORATED WITH SPC TO
ENSURE THE THREAT INCLUDED THE SAT AREA AS THE DRYLINE FORCING
COMBINED WITH INCREASING VERTICAL MOTION SIGNATURES ON SATELLITE
SUGGEST STORM WILL PROPAGATE SOUTHWARD ALONG THIS BOUNDARY. IT
SHOULD TAKE A FEW HOURS BEFORE THESE STORMS MAKE THIS SOUTHWARD
SHIFT SINCE CURRENT CONVECTION IS STILL SPORADIC OVER WEST CENTRAL
TEXAS.

AS CONVECTION MOVES TO CENTRAL AND EASTERN PARTS OF SC TX BY LATE
TONIGHT, THE PRECIPITABLE WATER VALUE SHOOT UP TO 1.5 INCHES WHICH
WOULD SUPPORT ISOLATED FLOODING PROBLEMS. HOWEVER, THE STRONG MID
LEVEL WINDS SHOULD KEEP STORMS MOVING AT A GOOD CLIP WITH A
PROGRESSIVE SQUALL LINE EXPECTED TO FORM BY THE TIME IT REACHES THE
ESCARPMENT. THE MAIN THREAT FOR SEVERE SHOULD BE FOR LARGE HAIL AND
DAMAGING WINDS. HOWEVER, LATE AFTERNOON SURFACE INFLOW SUGGESTS THAT
SUPERCELLS AND TORNADOES COULD FORM AS WELL.

STORMS SHOULD DRIFT EAST INTO THE HGX FORECAST AREA BY AROUND 3 AM
WITH DRY AND MILD AIR EXPECTED FOR MUCH OF THE WORK WEEK. IN THE
LATTER HALF OF THE WEEK, WILL CONTINUE TO KEEP IN SLIGHTLY HIGHER
MOISTURE CONTENT AND MILDER TEMPS THAN MODELS INDICATE SINCE THERE
IS A POTENTIAL FOR MOISTURE POOLING OVER SC TX AND AN ACTIVE
SUBTROPICAL JET. MODELS ARE SHOWING SOME CONSISTENCY AND AGREEMENT
ISSUES WITH WEAKENING UPSTREAM DISTURBANCES IN THIS UNSTABLE PATTERN
OVER THE WEEKEND, SO THE BEST BET FOR NOW IS FOR A BROADBRUSH OF
MILD WX WITH A SLIGHT CHANCE OF THUNDERSTORMS FOR FRIDAY AND BEYOND.

&&

.FIRE WEATHER...
CONVECTION OVER THE BURRO MOUNTAINS OF MEXICO PROMPTED A CONCERN FOR
DRY LIGHTNING FOR THE NEXT 4 HOURS OR SO OVER THE COUNTIES BORDERING
THE RIO GRANDE. MORE DETAILS ARE PROVIDED IN THE RED FLAG WARNING
PRODUCT (SATRFWEWX).

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
TX...SEVERE TSTM WATCH #148 TIL 5 AM CDT MOST OF SOUTH CENTRAL
 TEXAS AND EXTREME EASTERN HILL COUNTRY COUNTIES

&&

06/02/11/PM

Hazardous weather outlook, Apr 10, 4:05 AM CDT, 21 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
405 AM CDT SUN APR 10 2005

TXZ171>173-183>194-202>209-217>225-228-111100-
ATASCOSA-BANDERA-BASTROP-BEXAR-BLANCO-BURNET-CALDWELL-COMAL-DEWITT-
DIMMIT-EDWARDS-FAYETTE-FRIO-GILLESPIE-GONZALES-GUADALUPE-HAYS-KARNES-
KENDALL-KERR-KINNEY-LAVACA-LEE-LLANO-MAVERICK-MEDINA-REAL-TRAVIS-
UVALDE-VAL VERDE-WILLIAMSON-WILSON-ZAVALA-
405 AM CDT SUN APR 10 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...TODAY AND TONIGHT.
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON
AND TONIGHT NORTH AND EAST OF A LINE FROM MASON TO BOERNE TO
SPEAKS...INCLUDING THE CITY OF AUSTIN. A STRONG UPPER LEVEL STORM
SYSTEM LOCATED OVER THE FOUR CORNERS REGION WILL MOVE SLOWLY EASTWARD
CROSSING THE CENTRAL PLAINS ON MONDAY. A SQUALL LINE IS EXPECTED TO
DEVELOP ACROSS NORTH TEXAS THIS AFTERNOON ALONG THE TRAILING DRY
LINE. ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE WITHIN THE LINE
WITH LARGE HAIL AND DAMAGING WINDS BEING THE PRIMARY SEVERE WEATHER
THREATS. THE SQUALL LINE WILL BUILD SOUTHWESTWARD ALONG THE DRY LINE
INTO THE EASTERN HALF OF SOUTH CENTRAL TEXAS LATE THIS AFTERNOON INTO
TONIGHT. IT IS POSSIBLE THAT THE THREAT OF SEVERE THUNDERSTORMS WILL
EXTEND SOUTH OF THE SLIGHT RISK AREA TONIGHT WHICH WOULD ENCOMPASS
THE CITY OF SAN ANTONIO.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.
NO HAZARDOUS WEATHER IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS AFTERNOON AND TONIGHT.

In the hours before

Local storm report, Apr 10, 9:01 PM CDT, 4 hours 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
901 PM CDT SUN APR 10 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0855 PM     HAIL             HORSESHOE BAY           30.54N 98.35W
04/10/2005  0.75 INCH        LLANO              TX   LAW ENFORCEMENT

&&

PM

Local storm report, Apr 10, 10:04 PM CDT, 3 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1004 PM CDT SUN APR 10 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0945 PM     HAIL             3 SE KERRVILLE          30.01N 99.10W
04/10/2005  1.00 INCH        KERR               TX   STORM CHASER

1000 PM     HAIL             MEDINA                  29.80N 99.25W
04/10/2005  1.75 INCH        BANDERA            TX   TRAINED SPOTTER

&&

PM

Local storm report, Apr 10, 10:47 PM CDT, 2 hours 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1047 PM CDT SUN APR 10 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1035 PM     HAIL             10 W TARPLEY            29.63N 99.45W
04/10/2005  1.75 INCH        BANDERA            TX   LAW ENFORCEMENT

&&

PM

Local storm report, Apr 10, 10:58 PM CDT, 2 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1058 PM CDT SUN APR 10 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1045 PM     HAIL             1 E COMFORT             29.97N 98.89W
04/10/2005  1.75 INCH        KENDALL            TX   LAW ENFORCEMENT

&&

PM

Local storm report, Apr 10, 11:52 PM CDT, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1152 PM CDT SUN APR 10 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1100 PM     HAIL             10 SW BANDERA           29.62N 99.19W
04/10/2005  1.00 INCH        MEDINA             TX   LAW ENFORCEMENT

1140 PM     HAIL             6 N BOERNE              29.89N 98.74W
04/10/2005  1.75 INCH        KENDALL            TX   TRAINED SPOTTER

&&

PM

Local storm report, Apr 11, 12:43 AM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1243 AM CDT MON APR 11 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0812 PM     HAIL             KINGSLAND               30.66N 98.45W
04/10/2005  1.75 INCH        LLANO              TX   BROADCAST MEDIA

            GOLFBALL SIZE HAIL REPORTED AT SEVERAL LOCATIONS AROUND
            KINGSLAND

0830 PM     HAIL             1 N BURNET              30.78N 98.23W
04/10/2005  0.75 INCH        BURNET             TX   LAW ENFORCEMENT

0855 PM     HAIL             HORSESHOE BAY           30.54N 98.35W
04/10/2005  0.75 INCH        LLANO              TX   LAW ENFORCEMENT

0945 PM     HAIL             3 SE KERRVILLE          30.01N 99.10W
04/10/2005  1.00 INCH        KERR               TX   STORM CHASER

1000 PM     HAIL             MEDINA                  29.80N 99.25W
04/10/2005  1.75 INCH        BANDERA            TX   TRAINED SPOTTER

1035 PM     HAIL             10 W TARPLEY            29.63N 99.45W
04/10/2005  1.75 INCH        BANDERA            TX   LAW ENFORCEMENT

1045 PM     HAIL             1 E COMFORT             29.97N 98.89W
04/10/2005  1.75 INCH        KENDALL            TX   LAW ENFORCEMENT

1100 PM     HAIL             10 SW BANDERA           29.62N 99.19W
04/10/2005  1.00 INCH        MEDINA             TX   LAW ENFORCEMENT

1140 PM     HAIL             6 N BOERNE              29.89N 98.74W
04/10/2005  1.75 INCH        KENDALL            TX   TRAINED SPOTTER

&&

PM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 7:12 PM CDT	Severe Thunderstorm Warning	EWX	Llano	63 min
Apr 10, 8:16 PM CDT	Severe Thunderstorm Warning	EWX	Burnet	59 min
Apr 10, 8:22 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie	38 min
Apr 10, 8:50 PM CDT	Severe Thunderstorm Warning	EWX	Llano	13 min
Apr 10, 9:28 PM CDT	Severe Thunderstorm Warning	EWX	Bandera	62 min
Apr 10, 9:42 PM CDT	Severe Thunderstorm Warning	EWX	Real	33 min
Apr 10, 10:02 PM CDT	Severe Thunderstorm Warning	EWX	Kerr	43 min
Apr 10, 10:25 PM CDT	Severe Thunderstorm Warning	EWX	Kendall	65 min
Apr 10, 10:29 PM CDT	Severe Thunderstorm Warning	EWX	Bandera	61 min
Apr 10, 11:29 PM CDT	Severe Thunderstorm Warning	EWX	Kendall	46 min
Apr 10, 11:32 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit	58 min
Apr 10, 11:39 PM CDT	Severe Thunderstorm Warning	EWX	Blanco	54 min
Apr 11, 12:13 AM CDT	Severe Thunderstorm Warning	EWX	Comal, Hays, Travis	62 min
Apr 11, 12:51 AM CDT	Severe Thunderstorm Warning	EWX	Bexar, Medina	57 min
Apr 11, 1:14 AM CDT	Severe Thunderstorm Warning	EWX	Travis	61 min
Apr 11, 1:42 AM CDT	Severe Thunderstorm Warning	EWX	Comal	63 min

Nearby

Severe Thunderstorm Warnings in Texas, 2005 Every severe thunderstorm warning in 2005

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.