Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 4, NWS Austin/San Antonio, TX

April 12, 20154 counties in Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 12, 2015, 6:56 PM CDT for 4 counties in Texas. It was in force for 64 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 12, 2015, 6:56 PM CDT (23:56 UTC)
Expired: Apr 12, 2015, 8:00 PM CDT
In force: 64 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Dimmit County, TX, Kinney County, TX, Maverick County, TX, Zavala County, TX

What was reported inside it

Time	Report	Where	Remark
Apr 12, 7:35 PM CDT	TSTM WND GST 41	17 Wsw Gilson Groves, TX	41 MPH WIND GUST MEASURED BY THE FAITH RANCH AWOS STATION.

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

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 12, 5:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Del Rio, TX (KDLF), launched 12:00Z, 11.9 hours before the alert went out and 96 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: 1227 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 596 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

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

466 
WUUS54 KEWX 122356
SVREWX
TXC127-271-323-507-130100-
/O.NEW.KEWX.SV.W.0004.150412T2356Z-150413T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
656 PM CDT SUN APR 12 2015

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MAVERICK COUNTY IN SOUTH CENTRAL TEXAS...
  WESTERN ZAVALA COUNTY IN SOUTH CENTRAL TEXAS...
  SOUTHEASTERN KINNEY COUNTY IN SOUTH CENTRAL TEXAS...
  WESTERN DIMMIT COUNTY IN SOUTH CENTRAL TEXAS...

* UNTIL 800 PM CDT

* AT 656 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 15 MILES WEST OF QUEMADO TO 9 MILES SOUTHWEST OF
  ROSITA SOUTH TO 27 MILES SOUTHWEST OF CHUPADERA RANCH AIRPORT...
  MOVING EAST AT 45 MPH.

  HAZARD...60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  EAGLE PASS...CRYSTAL CITY...CARRIZO SPRINGS...SPOFFORD...EL
  INDIO...QUEMADO...ASHERTON...DARLING...GILSON GROVES...PALOMA...
  ROSITA SOUTH...COMETA...CARRIZO HILL...RADAR BASE...WINTER HAVEN...
  LAS COLONIAS...CHULA VISTA-RIVER SPUR...ROSITA NORTH...ANACACHO AND
  NORMANDY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 2820 10021 2828 10029 2831 10028 2840 10035
      2845 10034 2848 10037 2850 10033 2852 10039
      2858 10040 2866 10050 2880 10053 2890 10060
      2891 10064 2909 10067 2925 10023 2914 10011
      2909 10011 2909 10006 2879 9974 2820 9967
TIME...MOT...LOC 2356Z 254DEG 38KT 2889 10088 2856 10057 2799 10046 

HAIL...<.75IN
WIND...60MPH
 
$$

HAMPSHIRE

3 follow-up statements

046 
WWUS54 KEWX 130012
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
712 PM CDT SUN APR 12 2015

TXC127-271-323-507-130100-
/O.CON.KEWX.SV.W.0004.000000T0000Z-150413T0100Z/
MAVERICK TX-ZAVALA TX-KINNEY TX-DIMMIT TX-
712 PM CDT SUN APR 12 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR MAVERICK...WESTERN ZAVALA...SOUTHEASTERN KINNEY AND WESTERN
DIMMIT COUNTIES...

AT 711 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 7 MILES WEST OF QUEMADO TO NEAR ROSITA SOUTH TO 13
MILES SOUTHWEST OF CHUPADERA RANCH AIRPORT...MOVING EAST AT 45 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

LOCATIONS IMPACTED INCLUDE...
EAGLE PASS...CRYSTAL CITY...CARRIZO SPRINGS...SPOFFORD...EL INDIO...
QUEMADO...ASHERTON...DARLING...GILSON GROVES...PALOMA...ROSITA
SOUTH...COMETA...CARRIZO HILL...RADAR BASE...WINTER HAVEN...LAS
COLONIAS...CHULA VISTA-RIVER SPUR...ROSITA NORTH...ANACACHO AND
NORMANDY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 2820 10021 2828 10029 2831 10028 2840 10035
      2845 10034 2848 10037 2850 10033 2852 10039
      2858 10040 2866 10050 2880 10053 2890 10060
      2891 10064 2909 10067 2925 10023 2914 10011
      2909 10011 2909 10006 2879 9974 2820 9967
TIME...MOT...LOC 0011Z 253DEG 38KT 2892 10076 2859 10045 2808 10025 

HAIL...<.75IN
WIND...60MPH
 
$$

HAMPSHIRE

441 
WWUS54 KEWX 130037
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
737 PM CDT SUN APR 12 2015

TXC127-271-323-507-130100-
/O.CON.KEWX.SV.W.0004.000000T0000Z-150413T0100Z/
MAVERICK TX-ZAVALA TX-KINNEY TX-DIMMIT TX-
737 PM CDT SUN APR 12 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR MAVERICK...WESTERN ZAVALA...SOUTHEASTERN KINNEY AND WESTERN
DIMMIT COUNTIES...

AT 736 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 7 MILES NORTHEAST OF QUEMADO TO 8 MILES WEST OF COMETA
TO 7 MILES EAST OF CHUPADERA RANCH AIRPORT...MOVING EAST AT 45 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

LOCATIONS IMPACTED INCLUDE...
EAGLE PASS...CRYSTAL CITY...CARRIZO SPRINGS...SPOFFORD...EL INDIO...
QUEMADO...ASHERTON...DARLING...GILSON GROVES...PALOMA...ROSITA
SOUTH...COMETA...CARRIZO HILL...RADAR BASE...WINTER HAVEN...LAS
COLONIAS...CHULA VISTA-RIVER SPUR...ROSITA NORTH...ANACACHO AND
NORMANDY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 2820 10021 2828 10029 2831 10028 2840 10035
      2845 10034 2848 10037 2850 10033 2852 10039
      2858 10040 2866 10050 2880 10053 2890 10060
      2891 10064 2909 10067 2925 10023 2914 10011
      2909 10011 2909 10006 2879 9974 2820 9967
TIME...MOT...LOC 0036Z 253DEG 38KT 2903 10054 2867 10015 2815 9995 

HAIL...<.75IN
WIND...60MPH
 
$$

HAMPSHIRE

412 
WWUS54 KEWX 130059
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
759 PM CDT SUN APR 12 2015

TXC127-271-323-507-130109-
/O.EXP.KEWX.SV.W.0004.000000T0000Z-150413T0100Z/
MAVERICK TX-ZAVALA TX-KINNEY TX-DIMMIT TX-
759 PM CDT SUN APR 12 2015

...THE SEVERE THUNDERSTORM WARNING FOR MAVERICK...WESTERN ZAVALA...
SOUTHEASTERN KINNEY AND WESTERN DIMMIT COUNTIES WILL EXPIRE AT 800 PM
CDT...
    
THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW SEVERE
LIMITS...AND EXITED THE WARNED AREA. THEREFORE THE WARNING WILL BE
ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
SOUTH CENTRAL TEXAS.

LAT...LON 2820 10021 2828 10029 2831 10028 2840 10035
      2845 10034 2848 10037 2850 10033 2852 10039
      2858 10040 2866 10050 2880 10053 2890 10060
      2891 10064 2909 10067 2925 10023 2914 10011
      2909 10011 2909 10006 2879 9974 2820 9967
TIME...MOT...LOC 0057Z 254DEG 38KT 2903 10054 2867 10015 2815 9995 

$$

HAMPSHIRE

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 12, 6:34 PM CDT, 22 minutes earlier.

Area forecast discussion, Apr 12, 6:34 PM CDT, 22 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
634 PM CDT SUN APR 12 2015

.AVIATION.../00Z TAFS/
MAIN CONCERN THIS FORECAST PERIOD WILL BE THE CONVECTION THAT WILL
LIKELY IMPACT ALL TERMINALS OVERNIGHT. LINE OS SHOWERS AND
THUNDERSTORMS CONTINUES TO PROGRESS EAST ACROSS NORTHERN MEXICO AT
THIS TIME. LOOKS TO ARRIVE IN KDRT BETWEEN 2330Z AND 01Z. FOR THE
I-35 CORRIDOR LOOKS LIKE AROUND 04Z-05Z FOR KSAT/KSSF AND 05Z-06Z
FOR KAUS. WILL CONTINUE TO SEE RAIN AND SHOWERS BEHIND THE LINE
FOR A FEW HOURS. WOULD EXPECT TO SEE AT LEAST PATCHY FOG
DEVELOPING 10Z-12Z AND CONTINUING THROUGH 15Z. WILL SEE MVFR CIGS
DEVELOP 03Z-05Z THEN DOWN TO IFR AFTER 07Z-09Z. AFTER 17Z-19Z ALL
SITES SHOULD RETURN TO VFR. WILL SEE SOUTHERLY WINDS 5 TO 10 KNOTS
TONIGHT AND AGAIN ON MONDAY. WINDS WILL BE VARIABLE AND GUSTY IN
OR NEAR ANY CONVECTION WITH GUSTS TO 50 KNOTS POSSIBLE.

.UPDATE...
UPDATED POPS TO REFLECT RADAR TRENDS WITH ONGOING MCS MOVING INTO
THE RIO GRANDE VALLEY THAT CURRENTLY HAS TWO BOWING SEGMENTS. THE
FIRST HAS CROSSED INTO VAL VERDE COUNTY AND HAS ALREADY BEEN
ASSOCIATED WITH A SEVERE WIND GUST IN TERRELL COUNTY TO THE WEST.
THE SECOND BOWING SEGMENT IS CURRENTLY LOCATED IN COAHUILA MEXICO
AND WILL ENTER MAVERICK COUNTY AROUND 00Z. SHEAR VALUES OF APPROX
40 KT AND CAPE VALUES AROUND 2500 J/KG ARE AHEAD OF THIS MORE
SOUTHERN BOWING SEGMENT...WHEREAS CAPE VALUES ARE HIGHER AROUND
3000 J/KG AND SHEAR VALUES ARE LOWER AROUND 30 KT WITH THE
NORTHERN BOWING SEGMENT. BASED ON THESE VALUES AND FORWARD
PROPAGATION SPEEDS OF 20-25 KT...EXPECT STRAIGHT LINE WIND DAMAGE
UP TO 70 MPH IN THE STRONGEST BOWING SEGMENTS WITH SEVERE WINDS UP
TO 60 MPH POSSIBLE IN OTHER NON- BOWING SEGMENTS OF THE GUST
FRONT. TORNADO THREAT AND SEVERE HAIL THREAT SHOULD BE LOW.

SEVERE THUNDERSTORM WATCH MAY BE EXTENDED FURTHER EAST BASED ON
ONGOING RADAR AND MODEL TRENDS. WILL UPDATE IF NEEDED.

LH

&&

.PREV DISCUSSION... /ISSUED 237 PM CDT SUN APR 12 2015/

..ISOLATED SEVERE STORMS POSSIBLE AS A SHORT WAVE MOVES FROM THE
WEST THIS EVENING...

SHORT TERM (TONIGHT THROUGH MONDAY NIGHT)...
LATEST WATER VAPOR AND INFRARED CHANNELS ARE SHOWING A VIGOROUS
SHORT WAVE MOVING ACROSS NORTHERN MEXICO. THIS WAVE WILL CONTINUE
TO PUSH TO THE EAST AND APPROACH THE RIO GRANDE LATE THIS AFTERNOON
AND EVENING. THE MAJORITY OF THE HIRES SOLUTIONS AND MEDIUM RANGE
MODELS BRING A CONVECTIVE LINE ACROSS THE HIGH TERRAINS OF
NORTHEAST MEXICO AND INTO THE RIO GRANDE AROUND 5 OR 6 PM THIS
AFTERNOON. LATEST VISIBLE IMAGERY SHOWS CLEARING ACROSS THE
MEXICAN MOUNTAINS WITH TEMPERATURES IN THE MID TO UPPER 70S. OVER
THAT SAME AREA...A SURFACE TROUGH IS PRESENT WITH LAPSE RATE
READINGS IN THE 7.5 TO 8.0 C/KM RANGE. ALSO...AREA FORECAST
SOUNDINGS FOR A COUPLE OF POINTS ACROSS THE RIO GRANDE SUGGEST ML
CAPES OF 2000 J/KM AND DCAPE OF 800 J/KM...WHICH WILL RESULT IN
SEVERE STORM DEVELOPMENT AND DAMAGING WIND DOWNDRAFTS. THE THREAT
FOR SEVERE WEATHER CONTINUES AS THE CONVECTIVE LINE PUSHES AWAY
FROM THE RIO GRANDE AND APPROACHES HIGHWAY 281(THIS INCLUDES THE
SAN ANTONIO METRO AREA). STRONG TO SEVERE STORMS ARE FORECAST TO
ARRIVE TO THE SAN ANTONIO AREA BETWEEN 9-11 PM THIS EVENING. AS
THE STORMS MOVE EAST OF HIGHWAY 281...THEY ARE EXPECTED TO WEAKEN
AND TRANSITION TO HEAVY RAIN MAKERS. HOWEVER...CANT RULE OUT AN
ISOLATED STRONG TO SEVERE STORM. THE MAIN THREATS WILL BE DAMAGING
WIND GUSTS OF 60 TO 70 MPH WITH LARGE HAIL UP TO 2 INCHES IN
DIAMETER. ALSO...DUE TO THE HIGH VALUES OF PWATS ACROSS THE AREA
(1.6 TO 1.8 INCHES)...CANT RULE OUT SOME MINOR FLOODING ACROSS
AREA ROADS...UNDERPASSES AND POOR DRAINAGE AREAS.

THE SYSTEM WILL QUICKLY EXIT THE AREA OVERNIGHT WITH A BREAK FROM
THE RAIN THROUGH MONDAY AFTERNOON. RAIN CHANCES INCREASE ONCE
AGAIN MONDAY NIGHT INTO TUESDAY MAINLY ACROSS THE EASTERN HALF OF
SOUTH CENTRAL TEXAS AS A WEAK COLD FRONT MOVES THROUGH THE REGION.

LONG TERM (TUESDAY THROUGH SUNDAY)...
A WET PATTERN CONTINUES ON TUESDAY WITH A BREAK ON WEDNESDAY AS
THE ATMOSPHERE SETS UP FOR ANOTHER ROUND OF MODERATE RAINS ON
THURSDAY. A WEAK FRONTAL BOUNDARY IS FORECAST TO PUSH ACROSS THE
AREA LATE FRIDAY WITH SHOWERS AND STORMS MAINLY AFFECTING THE
NORTHEAST HILL COUNTRY. NEXT WEEKEND LOOKS GOOD THIS FAR OUT THE
SLIGHT CHANCES FOR RAIN ACROSS THE FAR SOUTHEAST COUNTIES.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              65  83  63  79  59 /  80  40  20  30  20
AUSTIN BERGSTROM INTL AIRPORT  64  82  63  78  58 /  80  40  20  40  20
NEW BRAUNFELS MUNI AIRPORT     64  83  63  80  59 /  90  30  20  30  20
BURNET MUNI AIRPORT            63  81  60  76  55 /  80  40  30  20  20
DEL RIO INTL AIRPORT           61  85  62  80  57 / 100  10  10  -   10
GEORGETOWN MUNI AIRPORT        64  81  62  77  57 /  80  40  30  40  20
HONDO MUNI AIRPORT             63  84  62  81  58 / 100  10  10  20  20
SAN MARCOS MUNI AIRPORT        64  83  63  78  59 /  80  30  20  30  20
LA GRANGE - FAYETTE REGIONAL   68  81  66  78  62 /  80  50  30  40  20
SAN ANTONIO INTL AIRPORT       66  84  64  80  60 /  90  20  20  20  20
STINSON MUNI AIRPORT           65  84  65  81  61 /  90  20  20  20  20

&&

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

MESOSCALE/AVIATION...10
SYNOPTIC/GRIDS...00
PUBLIC SERVICE/DATA COLLECTION...12

Hazardous weather outlook, Apr 12, 6:41 PM CDT, 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
641 PM CDT SUN APR 12 2015

TXZ171>173-183>194-202>209-217>225-228-132345-
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-
641 PM CDT SUN APR 12 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...TONIGHT.

WIDESPREAD SHOWERS AND THUNDERSTORMS ARE EXPECTED TONIGHT.
STRONG TO SEVERE STORMS ARE LIKELY WITH WIND GUSTS UP TO 70 MPH
BEING THE MAIN THREAT...GENERALLY WEST OF I-35. SMALL HAIL UP TO
QUARTER SIZE AND LOCALLY HEAVY RAINFALL IS POSSIBLE AND MAY CAUSE
SOME ISOLATED MINOR FLOODING. THE MOST LIKELY TIME FOR THESE
IMPACTS WILL BE THIS EVENING INTO THE EARLY OVERNIGHT HOURS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

THERE ARE CHANCES OF SHOWERS AND THUNDERSTORMS MONDAY THROUGH
FRIDAY...ESPECIALLY ACROSS EASTERN AREAS OF SOUTH CENTRAL TEXAS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE TONIGHT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 7:36 PM CDT	Special Weather Statement	EWX	Dimmit	54 min
Apr 11, 7:42 PM CDT	Areal Flood Advisory	EWX	Dimmit	63 min
Apr 12, 9:09 AM CDT	Areal Flood Advisory	EWX	Wilson	2 hr
Apr 12, 5:49 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	56 min
Apr 12, 6:46 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kinney, Val Verde	59 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015 Every severe thunderstorm warning in 2015

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.