Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 13, NWS Austin/San Antonio, TX

February 3, 2012Bexar County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Feb 3, 2012, 10:15 PM CST for Bexar County, Texas. It was in force for 30 min. 3 reports 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
Feb 3, 2012, 10:15 PM CST (04:15 UTC)
Expired
Feb 3, 2012, 10:45 PM CST
In force
30 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

County Bexar County, TX

The radar

The Austin/San Antonio radar (KEWX), 48 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
Feb 3, 10:30 PM CSTHAIL 11 W Balcones Heights, TXQUARTER SIZE NEAR BABCOCK AND 410.
Feb 3, 10:45 PM CSTHAIL 1Castle Hills, TXQUARTER SIZE HAIL AND 1 INCH OF RAINFALL IN 30 MINUTES.
Feb 3, 10:55 PM CSTHAIL 1Castle Hills, TX

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

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 4.3 hours before the alert went out and 227 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 2012-02-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2376 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 2012-02-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 square meters per square second.19395878Sfc1 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
2376 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
706 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
1.2
Supercell composite
6.5

Open this sounding in Storm Lab

The text

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

450 
WUUS54 KEWX 040415
SVREWX
TXC029-040445-
/O.NEW.KEWX.SV.W.0013.120204T0415Z-120204T0445Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1015 PM CST FRI FEB 3 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL BEXAR COUNTY...

* UNTIL 1045 PM CST.

* AT 1012 PM CST...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM
  WAS LOCATED NEAR LEON VALLEY...OR 7 MILES WEST OF SAN ANTONIO...AND
  MOVING EAST AT 20 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE OLMOS PARK...ALAMO HEIGHTS...
  HILL COUNTRY VILLA...TERRELL HILLS...HOLLYWOOD PARK...WINDCREST...
  LIVE OAK AND KIRBY.

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 2964 9836 2943 9828 2935 9865 2952 9871
TIME...MOT...LOC 0415Z 252DEG 17KT 2945 9860

$$
1 follow-up statement
979 
WWUS54 KEWX 040426
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1026 PM CST FRI FEB 3 2012

TXC029-040445-
/O.CON.KEWX.SV.W.0013.000000T0000Z-120204T0445Z/
BEXAR TX-
1026 PM CST FRI FEB 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CST
FOR CENTRAL BEXAR COUNTY...

AT 1018 PM CST...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR BALCONES
HEIGHTS...OR NEAR SAN ANTONIO...MOVING EAST AT 20 MPH.

SOME LOCATIONS IN THE WARNING AREA INCLUDE CASTLE HILLS...OLMOS
PARK...ALAMO HEIGHTS...HILL COUNTRY VILLA...SAN ANTONIO INT AP...
TERRELL HILLS...HOLLYWOOD PARK...MARTINEZ...WINDCREST...LIVE OAK AND
KIRBY.

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 2964 9836 2943 9828 2937 9860 2953 9866
TIME...MOT...LOC 0426Z 252DEG 17KT 2947 9854

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 3, 9:18 PM CSTAreal Flood AdvisoryEWXBexar2 hr
Feb 3, 9:45 PM CSTAreal Flood AdvisoryEWXWilliamson105 min
Feb 3, 10:02 PM CSTFlash Flood WarningEWXBexar118 min
Feb 3, 10:36 PM CSTFlash Flood WarningEWXWilliamson114 min
Feb 3, 10:38 PM CSTSevere Thunderstorm WarningEWXBexar37 min
Feb 3, 10:51 PM CSTFlash Flood WarningEWXBexar3 hr
Feb 3, 11:15 PM CSTSevere Thunderstorm WarningEWXBexar, Guadalupe60 min
Feb 4, 12:15 AM CSTSevere Thunderstorm WarningEWXBexar, Guadalupe, Wilson45 min
Feb 4, 12:57 AM CSTAreal Flood AdvisoryEWXBurnet2 hr
Feb 4, 1:07 AM CSTAreal Flood AdvisoryEWXHays, Travis113 min
Feb 4, 1:25 AM CSTFlash Flood WarningEWXTravis, Williamson3 hr
Feb 4, 1:54 AM CSTAreal Flood AdvisoryEWXBexar, Guadalupe, Wilson2 hr
Feb 4, 2:32 AM CSTAreal Flood AdvisoryEWXBandera, Medina118 min
Feb 4, 2:42 AM CSTFlash Flood WarningEWXHays, Travis3 hr
Feb 4, 3:11 AM CSTAreal Flood AdvisoryEWXBandera, Bexar, Medina109 min
Feb 4, 3:27 AM CSTAreal Flood AdvisoryEWXBastrop, Caldwell, Hays, Lee, Travis2 hr
Feb 4, 4:06 AM CSTAreal Flood AdvisoryEWXBexar, Comal, Guadalupe114 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.