Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 70, NWS Austin/San Antonio, TX

May 7, 20125 counties in Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 7, 2012, 8:57 PM CDT for 5 counties in Texas. It was in force for 48 min. 2 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: May 7, 2012, 8:57 PM CDT (01:57 UTC)
Expired: May 7, 2012, 9:45 PM CDT
In force: 48 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Atascosa County, TX, Bandera County, TX, Bexar County, TX, Frio County, TX, Medina County, TX

The radar

The Austin/San Antonio radar (KEWX), 105 km from the middle of the area, began a volume at 01:59 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

Time	Report	Where	Remark
May 7, 9:30 PM CDT	HAIL 1	1 Nne Lacoste, TX	ONE INCH SIZE HAIL.
May 7, 9:48 PM CDT	TSTM WND DMG	N Hondo, TX	NUMEROUS TREES AND TREE LIMB BLOWN DOWN AND SEVERAL POWER OUTAGES.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 7, 3:27 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 2.0 hours before the alert went out and 171 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1286 J/kg
Mixed-layer CIN: -248 J/kg
Mixed-layer LCL: 1023 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -57 m²/s²
0-3 km storm-relative helicity: -30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

509 
WUUS54 KEWX 080157
SVREWX
TXC013-019-029-163-325-080245-
/O.NEW.KEWX.SV.W.0070.120508T0157Z-120508T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
857 PM CDT MON MAY 7 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ATASCOSA COUNTY...
  EXTREME SOUTHEASTERN BANDERA COUNTY...
  SOUTHWESTERN BEXAR COUNTY...
  NORTHEASTERN FRIO COUNTY...
  EASTERN MEDINA COUNTY...

* UNTIL 945 PM CDT.

* AT 855 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  BADER...OR 7 MILES NORTHWEST OF CASTROVILLE...AND MOVING SOUTHEAST
  AT 100 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE BIRY...NOONAN...LACOSTE...
  PEARSON...LYTLE...NATALIA...DEVINE...SOMERSET...BIG FOOT...
  POTEET...LEMING...CHARLOTTE...PLEASANTON...JOURDANTON...
  CHRISTINE...SMITHSON VALLEY AND CAMPBELLTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
MONDAY EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2863 9835 2864 9857 2942 9922 2959 9892
      2877 9810 2862 9832 2862 9834
TIME...MOT...LOC 0157Z 323DEG 85KT 2937 9893

$$

1 follow-up statement

808 
WWUS54 KEWX 080217
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
917 PM CDT MON MAY 7 2012

TXC013-019-029-163-325-080245-
/O.CON.KEWX.SV.W.0070.000000T0000Z-120508T0245Z/
MEDINA TX-BEXAR TX-BANDERA TX-FRIO TX-ATASCOSA TX-
917 PM CDT MON MAY 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR ATASCOSA...NORTHEASTERN FRIO...EXTREME SOUTHEASTERN BANDERA...
SOUTHWESTERN BEXAR AND EASTERN MEDINA COUNTIES...

AT 913 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR NATALIA...OR
6 MILES NORTH OF DEVINE...MOVING SOUTHEAST AT 30 MPH.

SOME LOCATIONS IN THE WARNING AREA INCLUDE LYTLE...MIDWAY...MANGUS
CORNER...VON ORMY...SOMERSET...BIG FOOT...KYOTE...ROSSVILLE...IUKA...
DOBROWOLSKI...FASHING...PEGGY...AMPHION...ESPEY...COUGHRAN...MCCOY...
POTEET...PLEASANTON...LEMING...JOURDANTON...CHRISTINE...CHARLOTTE...
CAMPBELLTON AND SMITHSON VALLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
MONDAY EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2863 9835 2864 9857 2942 9922 2959 9892
      2877 9810 2862 9832 2862 9834
TIME...MOT...LOC 0217Z 320DEG 26KT 2920 9885

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 7:16 PM CDT	Severe Thunderstorm Warning	EWX	Edwards	44 min
May 7, 8:00 PM CDT	Areal Flood Advisory	EWX	Travis, Williamson	2 hr
May 7, 8:30 PM CDT	Severe Thunderstorm Warning	EWX	Zavala	49 min
May 7, 8:47 PM CDT	Tornado Warning	EWX	Zavala	28 min
May 7, 9:04 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit, Frio, Zavala	56 min
May 7, 9:29 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit	46 min
May 7, 9:29 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Bexar, Medina, Wilson	46 min
May 8, 12:56 AM CDT	Areal Flood Advisory	EWX	Lavaca	2 hr
May 8, 1:18 AM CDT	Areal Flood Advisory	EWX	DeWitt	2 hr
May 8, 10:33 AM CDT	Areal Flood Advisory	EWX	Bandera, Medina	117 min
May 8, 11:08 AM CDT	Areal Flood Advisory	EWX	Bexar	112 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012 Every 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.