Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 60, NWS Austin/San Antonio, TX

May 6, 2012Bexar County, Comal County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 6, 2012, 3:26 AM CDT for Bexar County, Comal County, Texas. It was in force for 34 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
May 6, 2012, 3:26 AM CDT (08:26 UTC)
Expired
May 6, 2012, 4:00 AM CDT
In force
34 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

Counties Bexar County, TX, Comal County, TX

The radar

The Austin/San Antonio radar (KEWX), 40 km from the middle of the area, began a volume at 08:28 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.

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 8.4 hours before the alert went out and 241 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 2012-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3568 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 2012-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -45 square meters per square second.1939Sfc1 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
3568 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
1651 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
-45 m²/s²
0-3 km storm-relative helicity
-67 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.

308 
WUUS54 KEWX 060826
SVREWX
TXC029-091-060900-
/O.NEW.KEWX.SV.W.0060.120506T0826Z-120506T0900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
326 AM CDT SUN MAY 6 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTH CENTRAL BEXAR COUNTY...
  WEST CENTRAL COMAL COUNTY...

* UNTIL 400 AM CDT.

* AT 323 AM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH.  THIS STORM WAS LOCATED NEAR SPRING BRANCH...OR 15 MILES WEST
  OF CANYON LAKE DAM...AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE IMPACT MAINLY RURAL AREAS OF
  THE INDICATED COUNTY.

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 2993 9832 2974 9836 2977 9860 2991 9844
TIME...MOT...LOC 0826Z 264DEG 27KT 2982 9842

$$
2 follow-up statements
912 
WWUS54 KEWX 060836
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
336 AM CDT SUN MAY 6 2012

TXC029-091-060900-
/O.CON.KEWX.SV.W.0060.000000T0000Z-120506T0900Z/
BEXAR TX-COMAL TX-
336 AM CDT SUN MAY 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 AM CDT
FOR WEST CENTRAL COMAL AND EXTREME NORTH CENTRAL BEXAR COUNTIES...

AT 330 AM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.
THIS STORM WAS LOCATED NEAR ANHALT...OR 16 MILES WEST OF CANYON LAKE 
DAM...MOVING EAST AT 30 MPH.

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 2993 9832 2974 9836 2977 9860 2991 9844
TIME...MOT...LOC 0836Z 267DEG 26KT 2979 9839

$$
225 
WWUS54 KEWX 060900
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
400 AM CDT SUN MAY 6 2012

TXC029-091-060909-
/O.EXP.KEWX.SV.W.0060.000000T0000Z-120506T0900Z/
BEXAR TX-COMAL TX-
400 AM CDT SUN MAY 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL COMAL AND EXTREME
NORTH CENTRAL BEXAR COUNTIES WILL EXPIRE AT 400 AM CDT...

THE SEVERE THUNDERSTORM HAS WEAKENED AND MOVED EAST.  THE WARNING 
WILL BE ALLOWED TO EXPIRE.  

LAT...LON 2993 9832 2974 9836 2977 9860 2991 9844
TIME...MOT...LOC 0859Z 267DEG 26KT 2980 9820

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 5, 8:33 PM CDTRiver Flood WarningEWXVal Verde19 days
May 6, 12:55 AM CDTAreal Flood AdvisoryEWXTravis, Williamson2 hr
May 6, 4:11 AM CDTAreal Flood AdvisoryEWXBexar3 hr
May 6, 6:12 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano63 min
May 6, 6:54 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano51 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.