Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 52, NWS Austin/San Antonio, TX

April 7, 2012Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 7, 2012, 11:08 PM CDT for Val Verde County, Texas. It was in force for 52 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 7, 2012, 11:08 PM CDT (04:08 UTC)
Expired
Apr 8, 2012, 12:00 AM CDT
In force
52 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 134 km from the middle of the area, began a volume at 04:08 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

TimeReportWhereRemark
Apr 7, 11:32 PM CDTHAIL 1.510 Nw Langtry, TXHAIL UP TO PING PONG SIZE ALONG WITH VERY HEAVY RAINFALL.

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

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 4.1 hours before the alert went out and 84 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-pSkew-T log-p diagram, Del Rio, TX at 00:00Z on 2012-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2090 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 00:00Z on 2012-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2090 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1383 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
82 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.

104 
WUUS54 KEWX 080408
SVREWX
TXC465-080500-
/O.NEW.KEWX.SV.W.0052.120408T0408Z-120408T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1108 PM CDT SAT APR 7 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  VAL VERDE COUNTY...

* UNTIL MIDNIGHT CDT.

* AT 1103 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A
  LINE EXTENDING FROM 14 MILES NORTHWEST OF PANDALE TO 9 MILES
  NORTHEAST OF PUMPVILLE TO 6 MILES SOUTH OF OSMAN TO 23 MILES
  SOUTHWEST OF LANGTRY...AND MOVING EAST AT 15 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE SHUMLA AND SEMINOLE CANYON
  STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS 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 3030 10176 3030 10117 3029 10115 2963 10131
      2965 10133 2964 10136 2973 10141 2974 10145
      2977 10147 2975 10154 2979 10155 2976 10157
      2974 10165 2978 10177
TIME...MOT...LOC 0407Z 264DEG 12KT 3034 10168 3004 10162
          2980 10165 2958 10182

$$
2 follow-up statements
466 
WWUS54 KEWX 080422
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1122 PM CDT SAT APR 7 2012

TXC465-080500-
/O.CON.KEWX.SV.W.0052.000000T0000Z-120408T0500Z/
VAL VERDE TX-
1122 PM CDT SAT APR 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR VAL VERDE COUNTY...

AT 1118 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 9 MILES NORTH OF PANDALE TO PANDALE TO 9 MILES 
SOUTH OF PANDALE TO LANGTRY TO 20 MILES SOUTHWEST OF 
LANGTRY...MOVING EAST AT 15 MPH.

SOME LOCATIONS IN THE WARNING AREA INCLUDE SHUMLA AND SEMINOLE CANYON
STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS 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 3030 10176 3030 10117 3029 10115 2963 10131
      2965 10133 2964 10136 2973 10141 2974 10145
      2977 10147 2975 10154 2979 10155 2976 10157
      2974 10165 2978 10177
TIME...MOT...LOC 0422Z 258DEG 15KT 3035 10161 3005 10155
          2982 10158 2960 10175

$$
435 
WWUS54 KEWX 080458
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1158 PM CDT SAT APR 7 2012

TXC465-080508-
/O.EXP.KEWX.SV.W.0052.000000T0000Z-120408T0500Z/
VAL VERDE TX-
1158 PM CDT SAT APR 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR VAL VERDE COUNTY WILL EXPIRE
AT MIDNIGHT CDT...

THE LINE OF THUNDERSTORMS HAVE WEAKENED BELOW SEVERE LEVELS. 
HOWEVER...HAIL TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 40 MPH 
CAN STILL BE EXPECTED AS IT MOVES EAST. 

LAT...LON 3030 10176 3030 10117 3029 10115 2963 10131
      2965 10133 2964 10136 2973 10141 2974 10145
      2977 10147 2975 10154 2979 10155 2976 10157
      2974 10165 2978 10177
TIME...MOT...LOC 0458Z 258DEG 15KT 3038 10144 3008 10138
          2985 10141 2963 10158

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 7, 11:41 PM CDTAreal Flood AdvisoryEWXVal Verde109 min
Apr 8, 12:14 AM CDTSevere Thunderstorm WarningEWXVal Verde46 min
Apr 8, 1:14 AM CDTAreal Flood AdvisoryEWXVal Verde106 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012Every severe thunderstorm warning in 2012

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.