Alert archive / Texas / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 20, NWS Austin/San Antonio, TX

April 20, 1996Gonzales County, Guadalupe County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 20, 1996, 4:55 AM CDT for Gonzales County, Guadalupe County, Texas. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 20, 1996, 4:55 AM CDT (09:55 UTC)
Expired
Apr 20, 1996, 6:00 AM CDT
In force
65 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties Gonzales County, TX, Guadalupe County, TX

The radar

The Austin/San Antonio radar (KEWX), 36 km from the middle of the area, began a volume at 09:54 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

Corpus Christi, TX (KCRP), launched 00:00Z, 9.9 hours before the alert went out and 202 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 1996-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1580 joules per kilogram.LCLLFCEL10008507005003002001001 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, Corpus Christi, TX at 00:00Z on 1996-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.193958Sfc1 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
1580 J/kg
Mixed-layer CIN
-393 J/kg
Mixed-layer LCL
1159 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
115 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.

000 
TTAA00 KSAT 200957
SVRSAT
TXC177-187-201100-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
455 AM CDT SAT APR 20 1996
 
THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  600 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL TEXAS
 
   ...GONZALES COUNTY...GUADALUPE COUNTY
 
AT 450 AM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS WITH HAIL
OVER GONZALES COUNTY JUST WEST OF GONZALES AND OVER GUADALUPE COUNTY JUSSOUTH OF SEGUIN. MOVEMENT WAS TO THE EAST-NORTHEAST AT 25 MPH.
 
 
PEOPLE IN THE PATH OF THIS STORM SHOULD BE ALERT TO THE POSSIBILITY
OF LARGE HAIL AND D6AMAGING WINDS.  FREQUENT LIGHTNING AND LOCALLY
HEAVY RAIN CAN ALSO OCCUR WITH SEVERE THUNDERSTORMS...FLOODING SMALL
STREAMS...LOW AREAS...AND LOW WATER CROSSINGS.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 3:55 AM CDTSevere Thunderstorm WarningEWXFayette50 min
Apr 20, 4:00 AM CDTSevere Thunderstorm WarningEWXGuadalupe45 min
Apr 20, 4:40 AM CDTSevere Thunderstorm WarningEWXFayette65 min
Apr 20, 10:19 AM CDTSevere Thunderstorm WarningEWXBandera41 min
Apr 20, 10:39 AM CDTSevere Thunderstorm WarningEWXKendall66 min
Apr 20, 11:11 AM CDTSevere Thunderstorm WarningEWXBexar, Comal64 min

Nearby

Severe Thunderstorm Warnings in Texas, 1996Every severe thunderstorm warning in 1996

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.