Alert archive / Texas / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 74, NWS Austin/San Antonio, TX

April 25, 2008Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 25, 2008, 8:44 PM CDT for Williamson County, Texas. It was in force for 61 min. 3 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: Apr 25, 2008, 8:44 PM CDT (01:44 UTC)
Expired: Apr 25, 2008, 9:45 PM CDT
In force: 61 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Williamson County, TX

The radar

The Ft Hood radar (KGRK), 22 km from the middle of the area, began a volume at 01:47 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
Apr 25, 9:00 PM CDT	TSTM WND DMG	3 Ese Granger Dam, TX	A BARN ALONG FM 1331 NEAR LANEPORT RECEIVED EXTENSIVE ROOF AND WALL DAMAGE. TIME WAS ESTIMATED BY RADAR
Apr 25, 9:05 PM CDT	HAIL 0.5	Thrall, TX	THE THRALL POLICE DEPARTMENT REPORTED HALF INCH HAIL ACROSS PORTIONS OF THE TOWN.
Apr 25, 9:15 PM CDT	HAIL 0.5	1 Nw Taylor, TX

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 16 minutes after it went out.

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 25, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.7 hours before the alert went out and 253 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1719 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: -63 m²/s²
0-3 km storm-relative helicity: 229 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 
WUUS54 KEWX 260144
SVREWX
TXC491-260245-
/O.NEW.KEWX.SV.W.0074.080426T0144Z-080426T0245Z/

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

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN WILLIAMSON COUNTY...

* UNTIL 945 PM CDT.

* AT 836 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 6 MILES EAST OF GRANGER DAM TO
  TAYLOR...OR ALONG A LINE EXTENDING FROM 13 MILES EAST OF GRANGER TO
  TAYLOR...AND MOVING SOUTHEAST AT 15 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  TAYLOR BY 850 PM CDT...
  THRALL BY 855 PM CDT...
  COUPLAND BY 925 PM CDT...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD 
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A 
SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 3060 9721 3057 9718 3056 9719 3053 9716
      3046 9716 3041 9733 3042 9735 3065 9756
      3075 9727
TIME...MOT...LOC 0144Z 329DEG 12KT 3066 9722 3057 9748

$$

1 follow-up statement

000 
WWUS54 KEWX 260211
SVSEWX

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

TXC491-260245-
/O.CON.KEWX.SV.W.0074.000000T0000Z-080426T0245Z/
WILLIAMSON TX-
911 PM CDT FRI APR 25 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR SOUTHEASTERN WILLIAMSON COUNTY...

AT 906 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG
A LINE EXTENDING FROM 7 MILES EAST OF THRALL TO COUPLAND...OR ALONG A
LINE EXTENDING FROM 11 MILES WEST OF ROCKDALE TO TAYLOR...MOVING
SOUTHEAST AT 15 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  THRALL AT 911 PM CDT...
  COUPLAND BY 925 PM CDT...

THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD 
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A 
SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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

LAT...LON 3046 9716 3041 9733 3042 9735 3058 9749
      3069 9725
TIME...MOT...LOC 0211Z 329DEG 12KT 3058 9717 3049 9743

$$

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 25, 6:37 PM CDT, 2 hours 7 minutes earlier.

Area forecast discussion, Apr 25, 6:37 PM CDT, 2 hours 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
637 PM CDT FRI APR 25 2008

.AVIATION...
A COLD FRONT MOVING INTO S CENTRAL TX WILL PRODUCE SCT TO NUMEROUS
SHRA/TSRA...SOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS THRU
06Z. THESE STORMS WILL AFFECT THE I35 TAF SITES BETWEEN 01Z AND 04Z.

&&

.PREV DISCUSSION... /ISSUED 256 PM CDT FRI APR 25 2008/

DISCUSSION...
CONVECTION WILL LIKELY FIRE ALONG WEAKENING COLD FRONT OVER CENTRAL
TEXAS LATE THIS AFTERNOON..BACK BUILDING INTO THE NORTHERN PORTIONS
OF THE REGION THIS EVENING AS THE FRONT STALLS. STEEP LAPSE RATES
AND STRONG CAPES MAY SUPPORT LARGE HAIL AND DAMAGING WINDS BY
EARLY EVENING OVER NORTHERN PORTIONS OF THE CWA. POTENTIAL
DEVELOPMENT AND TRAINING OF INDIVIDUAL CELLS ACROSS THE HILL COUNTRY
EASTWARD INTO EASTERN PORTIONS OF SOUTH CENTRAL TEXAS MAY ENHANCE
THE HEAVY RAIN THREAT LATER THIS EVENING INTO THE EARLY MORNING
HOURS. FRONTOLYSIS WILL OCCUR EARLY TOMORROW AND BY MIDDAY..SOUTHEAST
FLOW WILL AGAIN PREVAIL THROUGHOUT THE CWA. SOME UPSLOPE SHOWERS
AND STORMS MAY OCCUR ALONG THE RIO GRANDE PLAINS TOMORROW AS
MODERATE SOUTHEAST FLOW DEVELOPS AMID WEAK DISTURBANCES ALOFT.
STRONG COLD FRONT MOVES IN LATE SATURDAY NIGHT WITH ANOTHER ROUND
OF THUNDERSTORMS MAINLY ALONG THE FRONT. BREEZY AND MUCH COOLER
SUNDAY WITH DECREASING CLOUDS AS THE STRONG RIDGE BUILDS SOUTH.
AS THE COLD RIDGE SETTLES OVER THE REGION SUNDAY NIGHT..SEVERAL
LOW TEMPERATURE RECORDS MAY BE BROKEN IN THE SAN ANTONIO..AUSTIN
METRO AREAS. AS WINDS ALOFT BECOME MORE ZONAL AND SOUTHERLY FLOW
RETURNS..A WARMING TREND WILL BEGIN TUESDAY AND LAST THROUGH
THE REMAINDER OF THE WORK WEEK WITH NO PRECIPITATION EXPECTED.
GULF MOISTURE WILL REMAIN CAPPED WITH GOOD SOUTHWESTERLY FLOW
ALOFT WEDNESDAY THROUGH FRIDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              68  83  58  73  46 /  50  10  50  40   0
AUSTIN BERGSTROM INTL AIRPORT  67  82  57  69  43 /  50  10  50  40   0
DEL RIO INTL AIRPORT           71  85  59  75  49 /  30  20  30  10   0
SAN ANTONIO INTL AIRPORT       69  84  58  71  46 /  50  10  40  40   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

08/01

Hazardous weather outlook, Apr 25, 1:39 PM CDT, 7 hours 5 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
139 PM CDT FRI APR 25 2008

TXZ171>173-183>194-202>209-217>225-228-261100-
LLANO-BURNET-WILLIAMSON-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-
GILLESPIE-KENDALL-BLANCO-HAYS-TRAVIS-BASTROP-LEE-KINNEY-UVALDE-
MEDINA-BEXAR-COMAL-GUADALUPE-CALDWELL-FAYETTE-MAVERICK-ZAVALA-
FRIO-ATASCOSA-WILSON-KARNES-GONZALES-DE WITT-LAVACA-DIMMIT-
139 PM CDT FRI APR 25 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

A WEAKENING COLD FRONT WILL MOVE INTO THE AREA LATE THIS AFTERNOON
AND TONIGHT. ISOLATED TO SCATTERED THUNDERSTORMS CAN BE EXPECTED.
SOME OF THE STORMS MAY BECOME SEVERE LATE THIS AFTERNOON AND THIS
EVENING. LARGE HAIL AND DAMAGING WINDS ARE THE MAIN THREATS.
LOCALLY HEAVY RAINS WITH ISOLATED RAINFALL AMOUNTS UP TO 3 INCHES
ARE ALSO POSSIBLE TONIGHT DUE TO SLOW AND REPEAT STORM MOVEMENT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

A STRONG COLD FRONT WILL MOVE THROUGH THE AREA SUNDAY. SCATTERED
THUNDERSTORMS CAN BE EXPECTED LATE SATURDAY NIGHT INTO SUNDAY.
SOME OF THE STORMS MAY BECOME SEVERE. LARGE HAIL AND DAMAGING
WINDS ARE THE MAIN THREATS. LOCALLY HEAVY RAINS ARE ALSO POSSIBLE.

NO HAZARDOUS WEATHER IS EXPECTED SUNDAY NIGHT THROUGH THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON INTO TONIGHT
AND LATE SATURDAY NIGHT INTO SUNDAY.

In the hours before

Local storm report, Apr 25, 8:08 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
808 PM CDT FRI APR 25 2008

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

0803 PM     HAIL             WEIR                    30.67N  97.59W
04/25/2008  E1.75 INCH       WILLIAMSON         TX   LAW ENFORCEMENT

            WILLIAMSON COUNTY SHERIFF DEPUTY REPORT AND COCORAHS
            REPORT AT SAME LOCATION

&&

EVENT NUMBER 00007

Local storm report, Apr 25, 8:14 PM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
814 PM CDT FRI APR 25 2008

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

0813 PM     HAIL             WEIR                    30.67N  97.59W
04/25/2008  M1.25 INCH       WILLIAMSON         TX   TRAINED SPOTTER

            DOWNTOWN WIER

&&

EVENT NUMBER 00008

Local storm report, Apr 25, 8:21 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
821 PM CDT FRI APR 25 2008

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

0820 PM     HAIL             INGRAM                  30.08N  99.24W
04/25/2008  M1.00 INCH       KERR               TX   TRAINED SPOTTER

            HAIL BEGAN AT 805 PM AND WAS STILL FALLING AT TIME OF
            CALL

&&

EVENT NUMBER 00009

WR

Local storm report, Apr 25, 8:25 PM CDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
825 PM CDT FRI APR 25 2008

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

0823 PM     HAIL             2 W KERRVILLE           30.04N  99.17W
04/25/2008  M0.88 INCH       KERR               TX   TRAINED SPOTTER

            HAIL IS STILL FALLING AT TIME OF REPORT...BEGAN AT 815
            PM

&&

EVENT NUMBER 00010

WR

Local storm report, Apr 25, 8:33 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
833 PM CDT FRI APR 25 2008

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

0728 PM     HAIL             6 E JARRELL             30.82N  97.50W
04/25/2008  E1.75 INCH       WILLIAMSON         TX   AMATEUR RADIO

            GOLFBALL SIZE HAIL AT SCHWERTNER

&&

EVENT NUMBER 00011

Local storm report, Apr 25, 8:42 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
842 PM CDT FRI APR 25 2008

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

0827 PM     HAIL             2 N KERRVILLE           30.07N  99.14W
04/25/2008  E0.25 INCH       KERR               TX   BROADCAST MEDIA

            ALONG FM 783 NORTH OF KERRVILLE

&&

EVENT NUMBER 00012

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 7:04 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kerr	56 min
Apr 25, 7:40 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Kerr, Real	65 min
Apr 25, 7:44 PM CDT	Severe Thunderstorm Warning	EWX	Williamson	61 min
Apr 25, 7:46 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	44 min
Apr 25, 7:50 PM CDT	Tornado Warning	EWX	Williamson	55 min
Apr 25, 7:59 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie, Llano	61 min
Apr 25, 8:05 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Gillespie, Kerr	55 min
Apr 25, 8:14 PM CDT	Areal Flood Advisory	EWX	Williamson	2 hr
Apr 25, 8:18 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Real	57 min
Apr 25, 8:24 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Travis, Williamson	66 min
Apr 25, 8:29 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Edwards, Kerr, Kinney, Real, Val Verde	61 min
Apr 25, 8:58 PM CDT	Areal Flood Advisory	EWX	Bandera, Gillespie, Kerr	2 hr
Apr 25, 9:24 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Hays, Lee, Travis	66 min
Apr 25, 9:26 PM CDT	Severe Thunderstorm Warning	EWX	Kerr	34 min
Apr 25, 9:29 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Edwards, Kendall, Kerr, Kinney, Medina and 3 more	61 min
Apr 25, 9:47 PM CDT	Flash Flood Warning	EWX	Travis	118 min
Apr 25, 10:26 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Uvalde, Val Verde	64 min
Apr 25, 10:28 PM CDT	Severe Thunderstorm Warning	EWX	Hays	62 min
Apr 25, 10:30 PM CDT	Severe Thunderstorm Warning	EWX	Medina	24 min
Apr 25, 10:42 PM CDT	Flash Flood Warning	EWX	Hays	3 hr
Apr 25, 11:10 PM CDT	Severe Thunderstorm Warning	EWX	Fayette	50 min
Apr 25, 11:27 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Maverick, Uvalde, Val Verde, Zavala	63 min
Apr 26, 12:01 AM CDT	Severe Thunderstorm Warning	EWX	Bexar	44 min
Apr 26, 12:19 AM CDT	Areal Flood Advisory	EWX	Bastrop, Caldwell, Fayette, Gonzales, Guadalupe	116 min
Apr 26, 12:23 AM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Maverick, Zavala	82 min
Apr 26, 2:16 AM CDT	Severe Thunderstorm Warning	EWX	Dimmit	44 min
Apr 26, 2:24 AM CDT	Areal Flood Advisory	EWX	Atascosa, DeWitt, Fayette, Gonzales, Karnes, Lavaca and 1 more	2 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2008 Every severe thunderstorm warning 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.