Alert archive / Texas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 94, NWS Austin/San Antonio, TX

April 29, 2013Bexar County, Medina County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 29, 2013, 8:56 PM CDT for Bexar County, Medina County, Texas. It was in force for 34 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 29, 2013, 8:56 PM CDT (01:56 UTC)
Expired: Apr 29, 2013, 9:30 PM CDT
In force: 34 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Bexar County, TX, Medina County, TX

The radar

The Austin/San Antonio radar (KEWX), 79 km from the middle of the area, began a volume at 01:59 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 29, 9:04 PM CDT	HAIL 1	6 Sw Helotes, 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 8 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 nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 1.9 hours before the alert went out and 196 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: 394 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 2445 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

903 
WUUS54 KEWX 300156
SVREWX
TXC029-325-300230-
/O.NEW.KEWX.SV.W.0094.130430T0156Z-130430T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
856 PM CDT MON APR 29 2013

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL BEXAR COUNTY...
  NORTHEASTERN MEDINA COUNTY...

* UNTIL 930 PM CDT.

* AT 854 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM
  WAS LOCATED NEAR CLIFF...OR 14 MILES NORTHEAST OF CASTROVILLE...AND
  MOVING WEST AT 10 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE RIO MEDINA.

LAT...LON 2956 9893 2958 9892 2965 9869 2946 9860
      2935 9885
TIME...MOT...LOC 0156Z 078DEG 8KT 2951 9876

$$

2 follow-up statements

661 
WWUS54 KEWX 300216
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
916 PM CDT MON APR 29 2013

TXC029-325-300230-
/O.CON.KEWX.SV.W.0094.000000T0000Z-130430T0230Z/
MEDINA TX-BEXAR TX-
916 PM CDT MON APR 29 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR WEST CENTRAL BEXAR AND NORTHEASTERN MEDINA COUNTIES...

AT 912 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS
LOCATED NEAR CLIFF...OR 12 MILES NORTH OF CASTROVILLE...MOVING WEST
AT 10 MPH.

QUARTER SIZED HAIL WAS REPORTED BY THE PUBLIC ON TALLEY ROAD.

SOME LOCATIONS IN THE WARNING AREA INCLUDE RIO MEDINA.

LAT...LON 2956 9893 2958 9891 2965 9869 2946 9860
      2935 9885
TIME...MOT...LOC 0211Z 078DEG 8KT 2950 9880

$$

756 
WWUS54 KEWX 300226
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
926 PM CDT MON APR 29 2013

TXC029-325-300236-
/O.EXP.KEWX.SV.W.0094.000000T0000Z-130430T0230Z/
MEDINA TX-BEXAR TX-
926 PM CDT MON APR 29 2013

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BEXAR AND 
NORTHEASTERN MEDINA COUNTIES WILL BE ALLOWED TO EXPIRE AT 930 PM 
CDT...

THE STORM HAS WEAKENED BELOW SEVERE CRITERIA.

LAT...LON 2956 9893 2958 9891 2965 9869 2946 9860
      2935 9885
TIME...MOT...LOC 0226Z 078DEG 8KT 2949 9884

$$

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 29, 7:30 PM CDT, 1 hour 26 minutes earlier.

Area forecast discussion, Apr 29, 7:30 PM CDT, 1 hour 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
730 PM CDT MON APR 29 2013

.UPDATE...
500 HPA LOW OVER SOUTH CENTRAL TEXAS WILL CONTINUE TO MOVE EAST
THIS EVENING AND TONIGHT. EXPECTED SCT SHRA AND TSRA TO CONTINUE
THE NEXT FEW HOURS AND THEN BEGIN TO DIMINISH AND MOVE TO THE
EAST AND SOUTHEAST LATE TONIGHT THROUGH TUESDAY MORNING.
EXPECT LOW CLOUDS TO DEVELOP LATE TONIGHT AND THEN BECOME
PARTLY CLOUDY ON TUESDAY. ISOLATED AFTERNOON TO EARLY EVENING
SHOWERS ARE POSSIBLE OVER THE EAST TO SOUTHEAST EDGE OF
SOUTH CENTRAL TEXAS ON TUESDAY AFTERNOON.

&&

.PREV DISCUSSION... /ISSUED 656 PM CDT MON APR 29 2013/

DISCUSSION...

SEE AVIATION FOR 00Z TAFS.

AVIATION...
A WEAK LOW OVER SOUTH CENTRAL TEXAS WILL MOVE EAST OF THE AREA ON
TUESDAY...BRINGING MORE STABLE CONDITIONS NEAR AND WEST OF KAUS TO
KSAT. OVER THE EAST PART OF SOUTH CENTRAL TEXAS...SOME INSTABILITY
WILL BE LEFT IN WAKE OF THE LOW FOR ISOLATED AFTERNOON SHOWERS TO
DEVELOP AND CONTINUE THROUGH THE EARLY EVENING. TO THE NORTH...A
S/W TROF OVER THE NORTHERN ROCKIES WILL MOVE TO THE NORTHERN
PLAINS ON TUESDAY. THIS WILL CAUSE LOW PRESSURE TO INCREASE ACROSS
WEST AND NORTHWEST TEXAS...AND PROVIDE AN INCREASING PRESSURE
GRADIENT OVER SOUTH CENTRAL TEXAS FOR MODERATE SOUTH AND SOUTHEAST
WINDS TO DEVELOP DURING THE DAY ON TUESDAY AND CONTINUE THROUGH THE
EVENING. THROUGH 03Z 5 THSD SCT WITH CIGS NEAR AND ABOVE 10 THSD FT
ARE EXPECTED...WITH SCT SHRA AND TSRA...WHILE TO THE WEST IN VCNTY
OF KDRT VFR CONDITIONS WILL CONTINUE. THE SHRA AND TSRA ACTIVITY IS
EXPECTED TO DIMINISH AFTER 03Z. MVFR CIGS OF 1 THSD TO 2 THSD BKN
ARE EXPECTED VCNTY OF KAUS TO KSAT AND KSSF AFTER 05Z...AND WILL
SPREAD TO THE WEST IN VCNTY OF KDRT AFTER 09Z. CIGS NEAR 700 TO
1000 FT WITH VSBYS 3 TO 6 MILES IN FOG IS EXPECTED FROM AFTER 10Z
TO 14Z FROM VCNTY OF KAUS TO KSAT AND KSSF. AFTER 15Z CIGS OF
2 THSD TO 3 THSD BKN ARE EXPECTED BECOMING 4 THSD TO 6 THSD SCT
AFTER 17Z WITH SCT CIRRUS ABOVE 25 THSD FT.  MVFR CIGS ARE EXPECTED
TO DEVELOP AGAIN TUESDAY NIGHT AFTER 04Z FROM VCNTY OF KAUS TO KSAT
AND KSSF AND VCNTY OF KDRT AFTER 08Z.

PREV DISCUSSION... /ISSUED 334 PM CDT MON APR 29 2013/

SHORT TERM (TONIGHT THROUGH TUESDAY NIGHT)...
A MID TO UPPER LEVEL TROUGH IS MOVING ACROSS CENTRAL TEXAS THIS
AFTERNOON. THIS IS RESPONSIBLE FOR THE CONVECTION OVER OUR CWA AT
THIS TIME. CONVECTION WILL CONTINUE THROUGH THE AFTERNOON AND
EVENING AS THE UPPER FEATURE CONTINUES TOWARD THE EAST. ADJUSTED
MORNING SOUNDING FROM CORPUS CHRISTI SHOWS AROUND 1000 J/KG OF
CAPE WITH WEAK VERTICAL WIND SHEAR. SHEAR IS ALSO VARIED IN
DIRECTION...WIND DIRECTIONS VARY IN THE BOUNDARY LAYER. STORMS
COULD BE STRONG AND AN ISOLATED SEVERE STORM IS NOT OUT OF THE
QUESTION. THIS UPPER SYSTEM WILL BE OUT OF THE AREA TUESDAY AND
OUR WEATHER WILL BECOME DOMINATED BY LOW LEVEL SOUTHEASTERLY FLOW.
THIS WILL RETURN US TO LATE NIGHT/MORNING CLOUDINESS WITH
DECREASING CLOUDS IN THE AFTERNOON. TEMPERATURES WILL BE A BIT
WARMER TUESDAY.

LONG TERM (WEDNESDAY THROUGH MONDAY)...
WEDNESDAY WILL BE ABOUT THE SAME AS TUESDAY. BIG CHANGES WILL COME
WEDNESDAY NIGHT AND THURSDAY. MODELS CONTINUE TO BE CONSISTENT
WITH A STRONG FRONTAL SYSTEM MOVING THROUGH THE REGION. THIS WILL
BRING A CHANCE FOR SHOWERS AND THUNDERSTORMS WEDNESDAY NIGHT AND
THURSDAY. AT THIS TIME...IT DOES NOT LOOK LIKE THERE WILL BE ANY
SEVERE WEATHER. WINDS BEHIND THE FRONT WILL BE STRONG AND MAY
REQUIRE A WIND ADVISORY THURSDAY MORNING. TEMPERATURES WILL BE
MUCH COOLER BEHIND THE FRONT. LOW TEMPERATURES FRIDAY AND SATURDAY
WILL BE NEAR RECORDS. SATURDAY LOOKS TO BE THE COOLER MORNING. BY
SUNDAY THE SURFACE HIGH WILL MOVE FAR ENOUGH EAST TO ALLOW THE
WINDS TO SWITCH BACK AROUND TO THE SOUTHEAST LEADING TO A WARMING
TREND THROUGH THE END OF THE FORECAST PERIOD.

FIRE WEATHER...
THE COLD FRONT WILL BRING CRITICAL FIRE WEATHER WINDS THURSDAY
BEFORE THE DRY AIR MOVES IN. THEN FRIDAY AND SATURDAY THE DRY WILL
SETTLE OVER THE AREA AND THE RELATIVE HUMIDITY WILL DROP TO
CRITICAL LEVELS BOTH AFTERNOONS. THIS WILL MEAN ELEVATED FIRE
WEATHER CONDITIONS THURSDAY THROUGH SATURDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              65  87  65  87  57 /  40  10   0   0  30
AUSTIN BERGSTROM INTL AIRPORT  63  86  64  86  56 /  40  10   0   0  30
NEW BRAUNFELS MUNI AIRPORT     63  87  64  87  57 /  40  10   0   0  30
BURNET MUNI AIRPORT            62  86  65  86  54 /  40  10   0   0  30
DEL RIO INTL AIRPORT           67  92  70  93  58 /  10  -    0   0  30
GEORGETOWN MUNI AIRPORT        62  85  65  85  55 /  40  10   0   0  30
HONDO MUNI AIRPORT             64  87  66  88  59 /  30  -    0   0  30
SAN MARCOS MUNI AIRPORT        63  85  64  86  57 /  40  10   0   0  30
LA GRANGE - FAYETTE REGIONAL   68  87  67  87  61 /  40  10   0   0  10
SAN ANTONIO INTL AIRPORT       66  85  66  85  59 /  40  10   0   0  30
STINSON MUNI AIRPORT           66  85  66  85  60 /  40  10   0   0  30

&&

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

MESOSCALE/AVIATION...25
SYNOPTIC/GRIDS...08
PUBLIC SERVICE/DATA COLLECTION...31

Hazardous weather outlook, Apr 29, 4:00 AM CDT, 16 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
400 AM CDT MON APR 29 2013

TXZ171>173-183>194-202>209-217>225-228-300900-
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-
400 AM CDT MON APR 29 2013

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...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Local storm report, Apr 29, 8:07 PM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
807 PM CDT MON APR 29 2013

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

0800 PM     HAIL             BLANCO                  30.10N  98.42W
04/29/2013  M0.75 INCH       BLANCO             TX   CO-OP OBSERVER

&&

EVENT NUMBER EWX1300327

JPB

Special weather statement, Apr 29, 8:09 PM CDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
809 PM CDT MON APR 29 2013

TXZ190-300200-
BLANCO-
809 PM CDT MON APR 29 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN BLANCO COUNTY UNTIL 900
PM CDT...

AT 806 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM NEAR BLANCO...MOVING NORTHEAST AT 10 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  BLANCO...

THE HEAVY RAIN MAY FLOOD LOW LYING AREAS SUCH AS DITCHES...LOW WATER
CROSSINGS AND UNDERPASSES. DO NOT DRIVE YOUR VEHICLE ACROSS FLOODED
ROADWAYS.

LAT...LON 3031 9843 3022 9822 3000 9841 3014 9855
TIME...MOT...LOC 0108Z 224DEG 10KT 3012 9841

Local storm report, Apr 29, 8:21 PM CDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
821 PM CDT MON APR 29 2013

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

0815 PM     HAIL             1 ESE FREDERICKSBURG    30.26N  98.86W
04/29/2013  M1.00 INCH       GILLESPIE          TX   TRAINED SPOTTER

&&

EVENT NUMBER EWX1300328

JPB

Local storm report, Apr 29, 8:25 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
825 PM CDT MON APR 29 2013

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

0823 PM     HAIL             1 NNE HELOTES           29.58N  98.69W
04/29/2013  M0.25 INCH       BEXAR              TX   PUBLIC

&&

EVENT NUMBER EWX1300329

JPB

Local storm report, Apr 29, 8:46 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
846 PM CDT MON APR 29 2013

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

0840 PM     FLASH FLOOD      1 ESE HELOTES           29.56N  98.68W
04/29/2013                   BEXAR              TX   AMATEUR RADIO

            STREET FLOODING ON BANDERA HWY SOUTH OF 1560

&&

EVENT NUMBER EWX1300330

JPB

Local storm report, Apr 29, 8:48 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
848 PM CDT MON APR 29 2013

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

0840 PM     FLASH FLOOD      3 E HELOTES             29.57N  98.65W
04/29/2013                   BEXAR              TX   AMATEUR RADIO

            STREET FLOODING AT LOOP 1604 AT 1560

&&

EVENT NUMBER EWX1300331

JPB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 7:11 PM CDT	Areal Flood Advisory	EWX	Bexar	109 min
Apr 29, 7:25 PM CDT	Special Weather Statement	EWX	Burnet	35 min
Apr 29, 7:28 PM CDT	Special Weather Statement	EWX	Gillespie	32 min
Apr 29, 7:32 PM CDT	Special Weather Statement	EWX	Kendall	28 min
Apr 29, 7:40 PM CDT	Special Weather Statement	EWX	Frio	35 min
Apr 29, 7:44 PM CDT	Special Weather Statement	EWX	Bexar	46 min
Apr 29, 7:45 PM CDT	Special Weather Statement	EWX	Bandera	45 min
Apr 29, 7:58 PM CDT	Special Weather Statement	EWX	Gillespie	32 min
Apr 29, 8:09 PM CDT	Special Weather Statement	EWX	Blanco	51 min
Apr 29, 8:22 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kendall, Kerr	23 min
Apr 29, 8:23 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Medina	37 min
Apr 29, 8:53 PM CDT	Areal Flood Advisory	EWX	Bexar	2 hr
Apr 29, 10:26 PM CDT	Special Weather Statement	EWX	Medina	49 min
Apr 29, 10:43 PM CDT	Flash Flood Warning	EWX	Bexar, Medina	3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2013 Every severe thunderstorm warning in 2013

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.