Alert archive / Texas / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 89, NWS Austin/San Antonio, TX

April 28, 2004Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 28, 2004, 6:44 PM CDT for Val Verde County, Texas. It was in force for 31 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: Apr 28, 2004, 6:44 PM CDT (23:44 UTC)
Expired: Apr 28, 2004, 7:15 PM CDT
In force: 31 min
Issued by: NWS Austin/San Antonio, TX
Area: Counties, with a storm outline in the text

County Val Verde County, TX

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.7 hours before the alert went out and 2 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: 6 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 741 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 194 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.

787 
WUUS54 KEWX 282344
SVRSAT
TXC465-290015-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
644 PM CDT WED APR 28 2004

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  VAL VERDE COUNTY IN SOUTH CENTRAL TEXAS
  THIS INCLUDES THE CITY OF DEL RIO

* UNTIL 715 PM CDT

* AT 637 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR DEL RIO...OR ABOUT
  OVER DEL RIO...AND MOVING EAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  DEL RIO BY 650 PM CDT
  LAUGHLIN AFB BY 715 PM CDT

LAT...LON 2945 10080 2946 10070 2936 10071 2930 10077
          2928 10074 2925 10077 2927 10085 2935 10095
          2936 10101 2944 10101

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 28, 2:42 PM CDT, 4 hours 2 minutes earlier.

Area forecast discussion, Apr 28, 2:42 PM CDT, 4 hours 2 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
242 PM CDT WED APR 28 2004

.DISCUSSION...
NEXT ROUND OF CONVECTION DEVELOPING OVER WEST TX/NE MEX THIS AFTN AS
A S/W TROF KICKS ENEWD OUT OF W TX TONIGHT.  CLOUDS LIMITING HEATING
OVER THE CWA THIS AFTN AND THEREFORE INSTABILITY...EXCEPT OVR VAL
VERDE COUNTY WHERE LAPS SHOWS INCREASING CAPES 1000+ WITH ONLY A WEAK
CAP. EXPECT CONVECTION TO THE WEST TO BECOME BETTER ORGANIZED...AND
AGREE WITH SPC REGARDING MARGINAL SVR STORMS OVR VV COUNTY THIS
EVENING. DEVELOPING MCS TO WEAKEN OVER THE CWA TONIGHT WITH LOW CHC
POPS EASTERN CWA THU MORNING.  DECREASING CLOUDS AND WARMER THURSDAY
AS S CENTRAL TX SHOULD BE UNDER SUBSIDENCE FROM A S/W RDG.  A CLOSED
LOW DIGGING TOWARD THE 4-CORNERS FRIDAY WILL INCREASE MID LEVEL
CLOUDS AND THE SLY SFC PRES GRADIENT...WITH A CHANCE OF DRZL/STREAMER
SHOWERS DURING THE DAY AS THE GULF MOISTURE SURGES NWD.  THE 4-
CORNERS LOW TO OPEN/KICK OUT AS A TROF FRIDAY NIGHT/SATURDAY...
DRIVING A CDFNT THRU S TX SATURDAY MORNING.  THERE WILL BE A GOOD CHC
OF SHRA/TSRA WITH THE FRONT IN THE MORNING...ENDING FROM THE N BY
THE AFTN AS THE UPR TROF SLIPS TO THE EAST.  BY SATURDAY NIGHT AND
SUNDAY DECREASING CLOUDS/COOLER UNDER THE NWLY FLOW...THEN AN UPR RDG
PREVAILS MON-WED WITH WARMING TEMPERATURES AND AN INCREASING SLY
PRES GRADIENT BY WEDNESDAY AS THE NEXT LOW DIGS INTO THE WEST.
WILL INCREASE CLOUDS AND ADD SOME LOW 10-20% POPS FOR WED/THU AS LLJ
DEVELOPS IN THE OVERNIGHT HOURS...AND COULD SOME PATCHY DRZL OR
STREAMER SHOWERS OVR MUCH OF THE ERN HALF OF THE CWA.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              64  82  67  83 /  40  30  10  30
AUSTIN BERGSTROM INTL AIRPORT  62  82  65  82 /  40  30  10  30
DEL RIO INTL AIRPORT           64  86  68  87 /  40  10  10  10
SAN ANTONIO INTL AIRPORT       64  82  68  83 /  40  20  10  30

&&

.EWX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

01/11

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 6:42 PM CDT	Severe Thunderstorm Warning	EWX	Uvalde	108 min
Apr 28, 6:53 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	22 min

Nearby

Severe Thunderstorm Warnings in Texas, 2004 Every severe thunderstorm warning in 2004

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.