Alert archive / Texas / Tornado Warnings in 2012

Tornado Warning 23, NWS Austin/San Antonio, TX

May 10, 2012Dimmit County, Frio County, Zavala County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at May 10, 2012, 7:21 PM CDT for Dimmit County, Frio County, Zavala County, Texas. It was in force for 24 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 10, 2012, 7:21 PM CDT (00:21 UTC)
Expired
May 10, 2012, 7:45 PM CDT
In force
24 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

Counties Dimmit County, TX, Frio County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 110 km from the middle of the area, began a volume at 00:21 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 watch it was issued in

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

IssuedProductOfficeLasted
May 10, 11:40 AM CDTTornado WatchSPC8 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 0.4 hours before the alert went out and 162 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 2012-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 67 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 2012-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.1939587897Sfc1 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
67 J/kg
Mixed-layer CIN
-176 J/kg
Mixed-layer LCL
934 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

091 
WFUS54 KEWX 110021
TOREWX
TXC127-163-507-110045-
/O.NEW.KEWX.TO.W.0023.120511T0021Z-120511T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
721 PM CDT THU MAY 10 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN DIMMIT COUNTY...
  SOUTHWESTERN FRIO COUNTY...
  SOUTHEASTERN ZAVALA COUNTY...

* UNTIL 745 PM CDT.

* AT 717 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 15 MILES WEST OF
  DIVOT...OR ABOUT 9 MILES NORTHEAST OF BIG WELLS...MOVING EAST AT 40
  MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE DERBY AND DILLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN A MOBILE HOME OR VEHICLE...GET OUT AND GO TO A STURDY
SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH
OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT THURSDAY EVENING
FOR SOUTH CENTRAL TEXAS. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 800 PM CDT THURSDAY EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2860 9958 2884 9953 2888 9904 2863 9909
      2864 9938 2856 9939
TIME...MOT...LOC 0021Z 275DEG 33KT 2868 9945

$$
1 follow-up statement
835 
WWUS54 KEWX 110035
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
735 PM CDT THU MAY 10 2012

TXC127-163-507-110045-
/O.CON.KEWX.TO.W.0023.000000T0000Z-120511T0045Z/
DIMMIT TX-FRIO TX-ZAVALA TX-
735 PM CDT THU MAY 10 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
SOUTHEASTERN ZAVALA...SOUTHWESTERN FRIO AND NORTHEASTERN DIMMIT
COUNTIES...

AT 731 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A TORNADO. 
THIS TORNADO WAS LOCATED 8 MILES SOUTHWEST OF DIVOT...OR 11 MILES
WEST OF DILLEY...MOVING EAST AT 40 MPH.

SOME LOCATIONS IN THE WARNING AREA INCLUDE DERBY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN A MOBILE HOME OR VEHICLE...GET OUT AND GO TO A STURDY
SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH
OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT THURSDAY EVENING
FOR SOUTH CENTRAL TEXAS. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 800 PM CDT THURSDAY EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2860 9958 2884 9953 2888 9904 2863 9909
      2864 9938 2856 9939
TIME...MOT...LOC 0035Z 275DEG 33KT 2867 9930

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 10, 7:59 PM CDTRiver Flood WarningEWXKerr18 hr
May 10, 8:02 PM CDTFlash Flood WarningEWXHays, Travis, Williamson118 min
May 10, 8:26 PM CDTSevere Thunderstorm WarningEWXTravis, Williamson49 min
May 10, 8:32 PM CDTRiver Flood WarningEWXVal Verde30 hr
May 10, 8:34 PM CDTAreal Flood AdvisoryEWXBexar116 min
May 10, 9:10 PM CDTFlash Flood WarningEWXBexar, Comal, Guadalupe, Hays3 hr
May 10, 9:59 PM CDTAreal Flood AdvisoryEWXBastrop, Caldwell, Comal, Guadalupe, Hays, Lee and 2 more2 hr
May 10, 10:42 PM CDTFlash Flood WarningEWXBastrop, Caldwell, Guadalupe, Hays, Lee, Travis and 1 more4 hr
May 11, 12:06 AM CDTFlash Flood WarningEWXBexar, Comal3 hr
May 11, 2:37 AM CDTFlash Flood WarningEWXHays113 min

Nearby

Tornado Warnings in Texas, 2012Every tornado warning in 2012Tornadoes 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.