Alert archive / Texas / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 83, NWS Austin/San Antonio, TX

April 26, 2008Bexar County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 26, 2008, 12:01 AM CDT for Bexar County, Texas. It was in force for 44 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 26, 2008, 12:01 AM CDT (05:01 UTC)
Expired: Apr 26, 2008, 12:45 AM CDT
In force: 44 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Bexar County, TX

The radar

The Austin/San Antonio radar (KEWX), 50 km from the middle of the area, began a volume at 05:02 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.

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 nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 5.0 hours before the alert went out and 215 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: 1723 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 588 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 260501
SVREWX
TXC029-260545-
/O.NEW.KEWX.SV.W.0083.080426T0501Z-080426T0545Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1201 AM CDT SAT APR 26 2008

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN BEXAR COUNTY...

* UNTIL 1245 AM CDT.

* AT 1154 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR TERRELL
  HILLS...OR NEAR SAN ANTONIO...AND MOVING SOUTHEAST AT 22 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHINA GROVE BY 1210 AM CDT...

LAT...LON 2947 9820 2919 9847 2938 9874 2954 9852
TIME...MOT...LOC 0501Z 295DEG 19KT 2940 9841

$$

1 follow-up statement

000 
WWUS54 KEWX 260513
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1212 AM CDT SAT APR 26 2008

TXC029-260545-
/O.CON.KEWX.SV.W.0083.000000T0000Z-080426T0545Z/
BEXAR TX-
1212 AM CDT SAT APR 26 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR SOUTHERN BEXAR COUNTY...

AT 1206 AM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS STORM WAS 
LOCATED NEAR TERRELL HILLS...OR NEAR DOWNTOWN SAN ANTONIO...MOVING 
SOUTHEAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MARTINEZ AND 8 MILES NORTHEAST OF BUENA VISTA BY 1225 AM CDT... 
  CHINA GROVE BY 1230 AM CDT...

LAT...LON 2947 9820 2919 9847 2938 9874 2954 9852
TIME...MOT...LOC 0512Z 308DEG 13KT 2940 9842

$$

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, 11:14 PM CDT, 47 minutes earlier.

Area forecast discussion, Apr 25, 11:14 PM CDT, 47 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1114 PM CDT FRI APR 25 2008

.AVIATION...
A COLD FRONT MOVING SEWD ACROSS S CENTRAL CONTINUES TO FIRE STRONG
CONVECTION IN AND NEAR THE S CENTRAL TX TAF SITES. THE CONVECTION
WILL SLOWLY WEAKEN OVERNIGHT AND MOVE SOUTH...HOWEVER A RESIDUAL
BOUNDARY ACROSS THE AREA WILL LIKELY BE A FOCUS FOR REDEVELOPMENT
WITH HEATING ON SATURDAY. OTHERWISE VARIABLE VFR TO MVFR CIGS WILL
PREVAIL WITH LOCALLY LOWER IFR CONDITIONS POSSIBLE NEAR SUNRISE.

&&

.PREV DISCUSSION... /ISSUED 947 PM CDT FRI APR 25 2008/

UPDATE...
WATCH JUST EXTENDED TO COVER THE SAT METRO AREA AND EXTEND ALL
AREAS TIL MIDNIGHT. THE TRENDS MAY BEGIN TO CALM DOWN BY 12 AM,
SO THIS OPTION SEEMED BEST CONSIDERING THE STORMS RECENT SOUTHWARD
PROGRESS LATE THIS EVENING. POPS RAMPED UP AND FOCUSED FARTHER
SOUTH, AND CLOUDS ADJUSTED OUT WEST, AND WINDS WERE MODIFIED TO
CORRESPOND WITH THE EXPECTED NORTHERLY WINDS BEHIND SOLID LINE
THIS EVENING. OVERNIGHT TEMPS STILL LOOK REASONABLE.

PREV DISCUSSION... /ISSUED 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 /  60  10  50  40   0
AUSTIN BERGSTROM INTL AIRPORT  67  82  57  69  43 /  70  10  50  40   0
DEL RIO INTL AIRPORT           71  85  59  75  49 /  40  20  30  10   0
SAN ANTONIO INTL AIRPORT       69  84  58  71  46 /  70  10  40  40   0

&&

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

08/01

Hazardous weather outlook, Apr 25, 1:39 PM CDT, 10 hours 22 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, 10:22 PM CDT, 1 hour 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1022 PM CDT FRI APR 25 2008

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

0945 PM     HAIL             4 NNW AUSTIN            30.36N  97.78W
04/25/2008  M0.25 INCH       TRAVIS             TX   BROADCAST MEDIA

            HAIL REPORTED AT CAMP MABRY

&&

EVENT NUMBER 00030

Local storm report, Apr 25, 10:26 PM CDT, 1 hour 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1026 PM CDT FRI APR 25 2008

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

1000 PM     HAIL             2 NW AUSTIN             30.33N  97.77W
04/25/2008  E0.50 INCH       TRAVIS             TX   BROADCAST MEDIA

            HAIL AT 24TH STREET AND LEON STREET FROM 1000 TO 1005
            PM. RELAYED FROM SKYWARN SPOTTER

&&

EVENT NUMBER 00031

Local storm report, Apr 25, 10:30 PM CDT, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1030 PM CDT FRI APR 25 2008

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

0745 PM     HAIL             10 NNW KERRVILLE        30.18N  99.20W
04/25/2008  M0.25 INCH       GILLESPIE          TX   BROADCAST MEDIA

            HAIL AND 1.1 INCHES OF RAIN AT TIERRA LINDA RANCH

&&

EVENT NUMBER 00032

Local storm report, Apr 25, 10:47 PM CDT, 1 hour 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1047 PM CDT FRI APR 25 2008

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

0920 PM     HAIL             5 E ROUND ROCK          30.50N  97.59W
04/25/2008  M0.38 INCH       TRAVIS             TX   COCORAHS

&&

EVENT NUMBER 00033

Local storm report, Apr 25, 10:55 PM CDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1055 PM CDT FRI APR 25 2008

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

1020 PM     HAIL             1 NE TANGLEWOOD FOREST  30.18N  97.83W
04/25/2008  M0.38 INCH       TRAVIS             TX   COCORAHS

&&

EVENT NUMBER 00034

Local storm report, Apr 25, 11:27 PM CDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1127 PM CDT FRI APR 25 2008

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

1110 PM     HAIL             BRACKETTVILLE           29.32N 100.41W
04/25/2008  E1.00 INCH       KINNEY             TX   LAW ENFORCEMENT

            PEA TO QUARTER SIZE HAIL COVERING THE GROUND TO 2
            INCHES DEEP IN SPOTS.

&&

EVENT NUMBER 00035

ANDERSON

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, 8:44 PM CDT	Severe Thunderstorm Warning	EWX	Williamson	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, 12:19 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.