Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 112, NWS Austin/San Antonio, TX

September 27, 2012Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Sep 27, 2012, 11:16 PM CDT for Val Verde County, Texas. It was in force for 44 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
Sep 27, 2012, 11:16 PM CDT (04:16 UTC)
Expired
Sep 28, 2012, 12:00 AM CDT
In force
44 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 76 km from the middle of the area, began a volume at 04:18 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
Sep 27, 11:37 PM CDTTSTM WND DMG8 Nw Del Rio, TXSTRONG WINDS RIPPED PORCH ROOF FROM DIABLO EAST MARINA STORE WITH WALL AND CEILING DAMAGE IN STORE. NOT FAR AWAY A 28 FOOR PONTOON BOAT WAS FLIPPED FROM A PARKING LOT OVER A FENCE INTO A FIELD. ALSO LOTS OF SMALL HAIL PILED UP NEARBY.

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, 4.3 hours before the alert went out and 21 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 2012-09-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1100 joules per kilogram.LCLEL10008507005003002001001 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 2012-09-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 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
1100 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1744 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
2 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.

116 
WUUS54 KEWX 280416
SVREWX
TXC465-280500-
/O.NEW.KEWX.SV.W.0112.120928T0416Z-120928T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1116 PM CDT THU SEP 27 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

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

* UNTIL MIDNIGHT CDT.

* AT 1108 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE         
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL AND HEAVY      
  RAIN.  THIS STORM WAS LOCATED 7 MILES SOUTHWEST OF DEL RIO...AND   
  MOVING NORTH AT 25 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE AMISTAD VILLAGE.

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 2956 10119 2959 10085 2928 10087 2928 10089
      2937 10103 2943 10107 2945 10108 2946 10115
TIME...MOT...LOC 0416Z 177DEG 22KT 2934 10096

$$
1 follow-up statement
766 
WWUS54 KEWX 280443
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1143 PM CDT THU SEP 27 2012

TXC465-280500-
/O.CON.KEWX.SV.W.0112.000000T0000Z-120928T0500Z/
VAL VERDE TX-
1143 PM CDT THU SEP 27 2012

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

AT 1137 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE 
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL ALONG WITH VERY 
HEAVY RAIN.  THIS STORM WAS LOCATED NEAR AMISTAD VILLAGE...OR 8 
MILES NORTHWEST OF DEL RIO...MOVING NORTH AT 25 MPH.

SOME LOCATIONS IN THE WARNING AREA INCLUDE ROUGH CANYON REC AREA.

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 2943 10090 2943 10103 2957 10107 2959 10088
TIME...MOT...LOC 0443Z 177DEG 22KT 2950 10097

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 27, 7:16 PM CDTSpecial Weather StatementEWXAtascosa44 min
Sep 27, 10:26 PM CDTSpecial Weather StatementEWXKinney49 min
Sep 27, 10:45 PM CDTSevere Thunderstorm WarningEWXKinney, Maverick38 min
Sep 28, 5:00 AM CDTFlash Flood WatchEWXAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more38 hr
Sep 28, 6:01 PM CDTAreal Flood AdvisoryEWXBexar, Comal119 min
Sep 28, 6:40 PM CDTRiver Flood WarningEWXVal Verde7 hr

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.