Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 17, NWS Austin/San Antonio, TX

March 8, 2012Dimmit County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 8, 2012, 7:44 PM CST for Dimmit County, Texas. It was in force for 46 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 8, 2012, 7:44 PM CST (01:44 UTC)
Expired
Mar 8, 2012, 8:30 PM CST
In force
46 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

County Dimmit County, TX

The radar

The Laughlin AFB radar (KDFX), 119 km from the middle of the area, began a volume at 01:45 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, 1.7 hours before the alert went out and 164 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 2012-03-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 00:00Z on 2012-03-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -52 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1215 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
-52 m²/s²
0-3 km storm-relative helicity
437 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.3

Open this sounding in Storm Lab

The text

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

909 
WUUS54 KEWX 090144
SVREWX
TXC127-090230-
/O.NEW.KEWX.SV.W.0017.120309T0144Z-120309T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
744 PM CST THU MAR 8 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN DIMMIT COUNTY...

* UNTIL 830 PM CST.

* AT 736 PM CST...NATIONAL WEATHER SERVICE RADAR SHOWED A SEVERE
THUNDERSTORM NEAR BIG WELLS AND WEST OF VALLEY WELLS...MOVING EAST 
AT 25 MPH.

THIS THUNDERSTORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND 
DAMAGING WINDS NEAR OR IN EXCESS OF 60 MPH. 

 THIS STORM WAS LOCATED 
NEAR CATARINA...  OR 12 MILES SOUTH OF BIG WELLS...AND MOVING 
NORTHEAST AT 15 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE LIGHT...BRUNDAGE...
  BIG WELLS...VALLEY WELLS...AND CATARINA.

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 2863 9977 2863 9939 2821 9939 2820 9940
      2819 9965 2820 9977
TIME...MOT...LOC 0138Z 226DEG 14KT 2841 9962

$$
2 follow-up statements
013 
WWUS54 KEWX 090204
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
804 PM CST THU MAR 8 2012

TXC127-090230-
/O.CON.KEWX.SV.W.0017.000000T0000Z-120309T0230Z/
DIMMIT TX-
804 PM CST THU MAR 8 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CST
FOR EASTERN DIMMIT COUNTY...

AT 803 PM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING
QUARTER SIZE HAIL...AND DAMAGING WINDS NEAR OR IN EXCESS OF
60 MPH WAS LOCATED FROM NEAR VALLEY WELLS TO EAST OF CATARINA...
MOVING EAST AT 25 MPH. 

THE SEVERE THUNDERSTORM WILL REMAIN OVER THAT PART OF
DIMMIT COUNTY...EAST OF A CATARINA TO VALLEY WELLS LINE.

LAT...LON 2863 9977 2863 9939 2821 9939 2820 9940
      2819 9965 2820 9977
TIME...MOT...LOC 0201Z 226DEG 14KT 2847 9955

$$
108 
WWUS54 KEWX 090235
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
835 PM CST THU MAR 8 2012

TXC127-090242-
/O.EXP.KEWX.SV.W.0017.000000T0000Z-120309T0230Z/
DIMMIT TX-
835 PM CST THU MAR 8 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN DIMMIT COUNTY HAS
EXPIRED...

THE SEVERE THUNDERSTORM WARNING ISSUED FOR EASTERN DIMMIT COUNTY
EXPIRED AT 830 PM CST. THE THUNDERSTORMS HAVE MOVED EAST OF
DIMMIT COUNTY...WITH SCATTERED SHOWERS OVER THE COUNTY IN 
WAKE OF A FAST MOVING COLD FRONT. 

LAT...LON 2863 9977 2863 9939 2821 9939 2820 9940
      2819 9965 2820 9977
TIME...MOT...LOC 0204Z 226DEG 14KT 2848 9954

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 9, 3:56 AM CSTSevere Thunderstorm WarningEWXLlano34 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.