Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 48, NWS Austin/San Antonio, TX

March 29, 2012Bexar County, Guadalupe County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 29, 2012, 1:33 AM CDT for Bexar County, Guadalupe County, Texas. It was in force for 21 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
Mar 29, 2012, 1:33 AM CDT (06:33 UTC)
Expired
Mar 29, 2012, 1:54 AM CDT
In force
21 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

Counties Bexar County, TX, Guadalupe County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 6.6 hours before the alert went out and 219 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, Corpus Christi, TX at 00:00Z on 2012-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 801 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, Corpus Christi, TX at 00:00Z on 2012-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 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
801 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
986 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.2

Open this sounding in Storm Lab

The text

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

110 
WUUS54 KEWX 290633
SVREWX
TXC029-187-290715-
/O.NEW.KEWX.SV.W.0048.120329T0633Z-120329T0715Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
133 AM CDT THU MAR 29 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME EAST CENTRAL BEXAR COUNTY...
  WESTERN GUADALUPE COUNTY...

* UNTIL 215 AM CDT.

* AT 124 AM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE   
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM   
WAS LOCATED NEAR MARION...OR 10 MILES EAST OF UNIVERSAL CITY...AND   
MOVING NORTHEAST AT 10 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE MCQUEENEY...SEGUIN AND
  GERONIMO.

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 2971 9798 2954 9786 2943 9817 2959 9826
TIME...MOT...LOC 0632Z 243DEG 10KT 2955 9812

$$
1 follow-up statement
753 
WWUS54 KEWX 290654
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
154 AM CDT THU MAR 29 2012

TXC029-187-290700-
/O.CAN.KEWX.SV.W.0048.000000T0000Z-120329T0715Z/
GUADALUPE TX-BEXAR TX-
154 AM CDT THU MAR 29 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME EAST CENTRAL BEXAR AND
WESTERN GUADALUPE COUNTIES IS CANCELLED...

THE STRONG THUNDERSTORM THAT MOVED THROUGH MARION EARLY HAS 
DISSIPATED. HOWEVER...MODERATE TO HEAVY RAIN WILL CONTINUE ACROSS 
MARION AND SEGUIN AREAS THROUGH AT LEAST 230 AM.

LAT...LON 2971 9798 2954 9786 2943 9817 2959 9826
TIME...MOT...LOC 0650Z 243DEG 10KT 2957 9807

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 28, 7:30 PM CDTFlash Flood WarningEWXAtascosa, DeWitt, Karnes, Wilson3 hr
Mar 29, 12:52 AM CDTSevere Thunderstorm WarningEWXWilson38 min
Mar 29, 1:16 AM CDTAreal Flood AdvisoryEWXWilson104 min
Mar 29, 8:55 AM CDTAreal Flood AdvisoryEWXCaldwell4 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; the sounding from the Mesonet's radiosonde archive.