Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 77, NWS Austin/San Antonio, TX

May 26, 2009Dimmit County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 26, 2009, 2:45 AM CDT for Dimmit County, Texas. It was in force for 30 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: May 26, 2009, 2:45 AM CDT (07:45 UTC)
Expired: May 26, 2009, 3:15 AM CDT
In force: 30 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Dimmit County, TX

The radar

The Laughlin AFB radar (KDFX), 121 km from the middle of the area, began a volume at 07:45 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

Del Rio, TX (KDRT), launched 00:00Z, 7.8 hours before the alert went out and 165 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: 804 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 2869 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KEWX 260745
SVREWX
TXC127-260815-
/O.NEW.KEWX.SV.W.0077.090526T0745Z-090526T0815Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
245 AM CDT TUE MAY 26 2009

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN DIMMIT COUNTY...

* UNTIL 315 AM CDT.

* AT 243 AM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR CATARINA...
  OR 15 MILES SOUTH OF BIG WELLS...AND MOVING SOUTHEAST AT 30 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE LIGHT.

LAT...LON 2860 9957 2854 9938 2821 9938 2820 9940
      2819 9986 2820 9997
TIME...MOT...LOC 0745Z 285DEG 28KT 2835 9955

$$

1 follow-up statement

000 
WWUS54 KEWX 260812
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
312 AM CDT TUE MAY 26 2009

TXC127-260822-
/O.EXP.KEWX.SV.W.0077.000000T0000Z-090526T0815Z/
DIMMIT TX-
312 AM CDT TUE MAY 26 2009

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN DIMMIT COUNTY WILL
EXPIRE AT 315 AM CDT...

LAT...LON 2860 9957 2854 9938 2821 9938 2820 9940
      2819 9986 2820 9997
TIME...MOT...LOC 0812Z 285DEG 28KT 2829 9932

$$

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 May 25, 11:53 PM CDT, 2 hours 52 minutes earlier.

Area forecast discussion, May 25, 11:53 PM CDT, 2 hours 52 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1153 PM CDT MON MAY 25 2009

.AVIATION...
I-35 CORRIDOR TERMINALS GENERALLY VFR..SCATTERED THUNDERSTORMS WILL
PUSH THROUGH SOUTHERN I-35 CORRIDOR DURING THE EARLY MORNING HOURS
WITH CIGS AND VSBYS LOWER IN AND NEAR THUNDERSTORMS. WINDS STRONG
AND GUSTY IN AND NEAR THUNDERSTORMS..OTHERWISE SOUTH WINDS 5 TO 10
KTS. THUNDERSTORMS REDEVELOPING ACROSS THE I-35 CORRIDOR TUESDAY
AFTERNOON WITH CIGS AND VSBYS LOWER IN AND NEAR THUNDERSTORMS.
WINDS VARIABLE AND GUSTY IN AND NEAR THUNDERSTORMS. KDRT TERMINAL
LOW VFR/HIGH MVFR CIGS WITH AREAS OF LIGHT RAIN AND SHOWERS OR
THUNDERSTORMS DIMINISHING AFTER 08Z. WIDELY SCATTERED SHOWERS AND
STORMS REDEVELOPING TUESDAY AFTERNOON LOCALLY LOWERING CIGS AND
VSBYS. EAST TO SOUTHEAST WINDS 5 TO 10 KTS EXCEPT VARIABLE AND GUSTY
IN AND NEAR THUNDERSTORMS.

&&

.PREV DISCUSSION... /ISSUED 1048 PM CDT MON MAY 25 2009/

UPDATE...
QUICK UPDATE FOR CONTINUED THUNDERSTORMS.

DISCUSSION...
THUNDERSTORMS CONTINUING FROM HILL CENTRAL HILL COUNTRY TO RIO
GRANDE. UPDATED POPS...WEATHER...AND QPF.

PREV DISCUSSION... /ISSUED 818 PM CDT MON MAY 25 2009/

UPDATE...
CONVECTION OUT WEST.

DISCUSSION...
STRONG THUNDERSTORMS ARE MOVING SLOWLY THROUGH VAL VERDE COUNTY.
HEAVY RAIN HAS LED TO FLASH FLOOD WARNING IN WESTERN PART OF THE
COUNTY. EXPECT THESE STORMS TO CONTINUE FOR THE NEXT FEW
HOURS...AND THEN THINGS SHOULD SETTLE DOWN ONCE WE LOSE DAY TIME
HEATING. HAVE ADJUSTED GRIDS TO ACCOUNT FOR POPS...WEATHER...AND
QPF. HOWEVER...THESE CHANGES HAVE NO EFFECT ON ZONES. WILL MAKE
SOME MANUAL CHANGES TO VAL VERDE ZONE AND HAVE NEW PRODUCT OUT
SHORTLY.

PREV DISCUSSION... /ISSUED 646 PM CDT MON MAY 25 2009/

AVIATION...
I-35 CORRIDOR TERMINALS FEW ISOLD SHOWERS TIL 01Z OTHERWISE VFR.
SOME PATCHY MVFR CIGS MAY DEVELOP KAUS TERMINAL BETWEEN 10Z AND
13Z. WIDELY SCATTERED SHOWERS AND THUNDERSTORMS DEVELOPING TUESDAY
AFTERNOON WILL LOCALLY LOWER CIGS AND VSBYS.

PREV DISCUSSION... /ISSUED 415 PM CDT MON MAY 25 2009/

DISCUSSION...
S/W TROF TRACKING EAST FROM THE BIG BEND IS EXPECTED TO SLOWLY
LOOSE SOME AMPLITUDE AS IT MOVES INTO THE WEAK RIDGE OVER SOUTH
CENTRAL TEXAS...LEFT IN WAKE OF SATURDAY AND SUNDAYS WEATHER
SYSTEMS. THIS S/W TROF IS EXPECTED TO HAVE ENOUGH ENERGY TO
TRIGGER WIDELY SCATTERED SHOWERS NEAR THE RIO GRANDE TO THE
RIO GRANDE PLAINS AND POSSIBLY THE WESTERN AND NORTHERN HILL
COUNTRY THIS EVENING...SO WILL CONTINUE WITH POSSIBLE SHOWERS
OVER THE WEST PART OF SOUTH CENTRAL TEXAS THIS EVENING.

AS THE AREA OF LOW PRESSURE OVER MISSOURI LIFTS NORTHWARD TONIGHT
AND TUESDAY...A WEAKENED HEIGHT FIELD WILL EVOLVE SOUTHWEST OF THIS
WEATHER SYSTEM TO WEST TEXAS TONIGHT AND TUESDAY.  THIS LATE MAY
PATTERN WILL FAVOR A CHANCE OF RAIN FOR THE NEXT FEW DAYS ACROSS
SOUTH CENTRAL TEXAS...AS A SERIES OF S/W TROFS MOVE FROM WEST TEXAS
TO THE GREAT PLAINS.  FOR TUESDAY THROUGH WEDNESDAY...WITH THE
PATHWAY OPEN FOR MORE S/W ENERGY TO COME FROM THE WEST...WILL
CONTINUE THE CHANCE OF SHOWERS AND THUNDERSTORMS BEGINNING TUESDAY
AFTERNOON AND CONTINUING TUESDAY NIGHT AND WEDNESDAY.  WITH THE
SLOW MOVEMENT OF THE S/W TROF...SOME LOCALLY HEAVY RAIN IS POSSIBLE
AGAIN LATE TUESDAY THROUGH WEDNESDAY. SHOWED A SPECIAL WEATHER
STATEMENT FOR THIS WEATHER SYSTEM TUESDAY THROUGH WEDNESDAY.

FORECASTS FOR THURSDAY SHOW THE STORM TRACK SHIFTING A LITTLE
FURTHER SOUTH...AS S/W ENERGY COMES ACROSS SOUTH CENTRAL TEXAS
FROM THE WEST AND NORTHWEST. IF THE WESTERLIES MAKE THIS TYPE OF
PATTERN...THERE IS ENOUGH SUPPORT TO BRING A LATE MAY COOL FRONT
ACROSS THE AREA ON THURSDAY TO EARLY FRIDAY. THIS BRINGS TO FOCUS
A CHANCE OF SHOWERS OR THUNDERSTORMS THURSDAY. ON FRIDAY A
TRANSITION TO MORE STABLE CONDITIONS IS EXPECTED IN WAKE OF THE
500-HPA TROF THAT PASSES EAST OF SOUTH CENTRAL TEXAS. LEFT
ISOLATED SHOWERS FOR FRIDAY OVER THE EXTREME SOUTH AND SOUTHWEST
PART OF SOUTH CENTRAL TEXAS. FORECASTS STILL SHOW A RIDGE
DEVELOPING OVER THE AREA LATE FRIDAY THROUGH SATURDAY. THIS WOULD
BE A WEAK RIDGE...EVEN FOR A LATE MAY SETTING...YET CONTINUES TO
SHOW IN THE FORECAST SOLUTIONS AND FITS THE 2009 SPRING TRENDS.
FOR SATURDAY MAY 30TH...WILL CONTINUE WITH MOSTLY SUNNY CONDITIONS
WITH WARM AFTERNOON HIGHS. ON SUNDAY MAY 31...HEIGHT FIELD WEAKENS
FROM THE WEST AGAIN IN A TREND THAT COULD CONTINUE THROUGH MONDAY...
JUNE 1ST. THIS TYPE OF PATTERN WOULD INDICATE WIDELY SCATTERED
SHOWERS OVER THE WEST PART OF THE AREA SUNDAY EVENING. THERE IS A
SLIGHT CHANCE OF SHOWERS OVER THE EAST PART OF THE AREA
MONDAY...JUNE 1ST...AS A WEAK 700 TO 300-HPA TROF MOVES FROM
CENTRAL TEXAS TO LOUISIANA.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              71  92  69  88  68 /  10  20  40  50  30
AUSTIN BERGSTROM INTL AIRPORT  68  92  67  88  65 /  10  20  40  50  30
NEW BRAUNFELS MUNI AIRPORT     68  93  69  88  66 /  20  20  40  50  30
BURNET MUNI AIRPORT            69  91  67  86  65 /  20  20  40  40  20
DEL RIO INTL AIRPORT           71  96  71  92  70 /  40  20  40  20  30
GEORGETOWN MUNI AIRPORT        71  92  68  87  65 /  20  20  40  40  30
HONDO MUNI AIRPORT             68  92  70  89  66 /  30  20  40  40  30
SAN MARCOS MUNI AIRPORT        68  93  68  88  67 /  10  20  40  50  30
LA GRANGE - FAYETTE REGIONAL   70  92  70  88  69 /  10  20  20  50  30
SAN ANTONIO INTL AIRPORT       71  92  71  88  68 /  20  20  40  50  30
STINSON MUNI AIRPORT           70  93  71  89  68 /  20  20  40  50  30

&&

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

05/02

Hazardous weather outlook, May 25, 5:27 AM CDT, 21 hours 18 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
527 AM CDT MON MAY 25 2009

TXZ171>173-183>194-202>209-217>225-228-261030-
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-
527 AM CDT MON MAY 25 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...TODAY AND TONIGHT...
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...
A STORM SYSTEM WILL APPROACH THE REGION ON TUESDAY. THIS SYSTEM
WILL BRING A CHANCE FOR SHOWERS AND THUNDERSTORMS TUESDAY NIGHT
AND WEDNESDAY. SOME OF THESE STORMS MAY BE SEVERE. LOCALLY HEAVY
RAINFALL WILL ALSO BE POSSIBLE TUESDAY NIGHT AND WEDNESDAY...WHICH
MAY LEAD TO FLASH FLOODING.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED TUESDAY NIGHT AND WEDNESDAY.

In the hours before

Special weather statement, May 25, 11:52 PM CDT, 2 hours 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1152 PM CDT MON MAY 25 2009

TXZ187-203-204-219-260530-
BANDERA-FRIO-MEDINA-UVALDE-
1152 PM CDT MON MAY 25 2009

...A STRONG THUNDERSTORM WAS AFFECTING BANDERA...FRIO...MEDINA AND
UVALDE COUNTIES...

AT 1150 PM CDT...NWS METEOROLOGISTS ARE TRACKING A STRONG
THUNDERSTORM NEAR DHANIS...OR 7 MILES WEST OF HONDO...MOVING EAST AT
20 MPH.

PEOPLE IN EASTERN UVALDE...MEDINA...NORTHERN FRIO AND SOUTHEASTERN
BANDERA COUNTIES...INCLUDING THE FOLLOWING LOCATIONS...DHANIS...
HONDO...NEW FOUNTAIN...QUIHI AND DUNLAY...SHOULD MONITOR THE WEATHER
SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO
TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

ONE HALF INCH HAIL AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS
STORM.

Local storm report, May 26, 12:06 AM CDT, 2 hours 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1206 AM CDT TUE MAY 26 2009

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

1205 AM     HAIL             HONDO                   29.36N  99.16W
05/26/2009  E0.25 INCH       MEDINA             TX   LAW ENFORCEMENT

            PEA SIZE HAIL REPORTED IN HONDO.

&&

EVENT NUMBER 00598

CJM

Local storm report, May 26, 12:09 AM CDT, 2 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1209 AM CDT TUE MAY 26 2009

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

1158 AM     TSTM WND GST     HONDO                   29.36N  99.16W
05/25/2009  M59 MPH          MEDINA             TX   ASOS

            HONDO ASOS REPORTED A WIND GUST OF 59 MPH.

&&

EVENT NUMBER 00599

CJM

Local storm report, May 26, 12:23 AM CDT, 2 hours 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1223 AM CDT TUE MAY 26 2009

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

1218 AM     HAIL             5 SE HONDO              29.31N  99.10W
05/26/2009  E0.70 INCH       MEDINA             TX   PUBLIC

            PUBLIC REPORTED DIME SIZE HAIL SOUTHEAST OF HONDO.

&&

EVENT NUMBER 00600

CJM

Local storm report, May 26, 12:30 AM CDT, 2 hours 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1230 AM CDT TUE MAY 26 2009

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

1205 AM     HAIL             HONDO                   29.36N  99.16W
05/26/2009  E0.25 INCH       MEDINA             TX   EMERGENCY MNGR

            EMERGENCY MANAGER REPORTED PEA SIZE HAIL IN HONDO.

&&

EVENT NUMBER 00601

CJM

Special weather statement, May 26, 1:24 AM CDT, 1 hour 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
124 AM CDT TUE MAY 26 2009

TXZ219-220-260730-
FRIO-ATASCOSA-
INCLUDING THE CITIES OF...PEARSALL...PLEASANTON
124 AM CDT TUE MAY 26 2009

A LINE OF VERY STRONG THUNDERSTORMS WILL CONTINUE TO MOVE SOUTHEAST
AT 35 TO 40 MPH ACROSS FRIO AND WESTERN ATASCOSA COUNTIES. THESE
STORMS WILL PRODUCE DANGEROUS FREQUENT CLOUD TO GROUND LIGHTNING
AS WELL AS TORRENTIAL RAINFALL. SMALL HAIL AND WIND GUSTS OF 50 TO
60 MPH ARE ALSO POSSIBLE. THE STORMS ARE EXPECTED TO MOVE OUT OF
FRIO AND ATASCOSA COUNTIES BY 2:30 AM.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 7:46 PM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
May 25, 8:31 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr, Real	44 min
May 25, 9:14 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr, Real	46 min
May 25, 9:52 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Edwards, Kerr, Real, Uvalde	38 min
May 25, 10:14 PM CDT	Flash Flood Warning	EWX	Edwards, Kerr, Real, Uvalde	3 hr
May 25, 10:34 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Medina, Real, Uvalde	41 min
May 26, 12:02 AM CDT	Severe Thunderstorm Warning	EWX	Medina	43 min
May 26, 12:37 AM CDT	Severe Thunderstorm Warning	EWX	Bandera, Bexar, Comal, Kendall, Medina	38 min
May 26, 1:04 AM CDT	Areal Flood Advisory	EWX	Atascosa, Frio, Medina, Uvalde, Zavala	116 min
May 26, 1:11 AM CDT	Areal Flood Advisory	EWX	Bexar, Comal, Kendall	2 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Every severe thunderstorm warning in 2009

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.