Alert archive / Texas / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 48, NWS Austin/San Antonio, TX

May 12, 1987DeWitt County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 12, 1987, 6:25 PM CDT for DeWitt County, Texas. It was in force for 65 min.

The area

The counties it named.

The facts

Issued
May 12, 1987, 6:25 PM CDT (23:25 UTC)
Expired
May 12, 1987, 7:30 PM CDT
In force
65 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County DeWitt County, TX

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Victoria Regiona, TX (KVCT), launched 12:00Z, 11.4 hours before the alert went out and 51 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, Victoria Regiona, TX at 12:00Z on 1987-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1662 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, Victoria Regiona, TX at 12:00Z on 1987-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939Sfc1 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
1662 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
639 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KVCT 122323
SVRVCT
TXC123-130030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE VICTORIA TX
625 PM CDT TUE MAY 12 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 730 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...

IN...DEWITT

AT 620 PM CDT...AN INTENSE THUNDERSTORM WAS SHOWN IN DEWITT COUNTY
AT CUERO MOVING SOUTHERLY NEAR 10 MILES AN HOUR.


PEOPLE IN THE PATH OF THIS DANGEROUS STORM SHOULD BE ALERT FOR
HAIL...DEADLY LIGHTNING...AND TORRENTIAL RAIN REDUCING VISIBILITY.

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 5:15 PM CDTSevere Thunderstorm WarningEWXVictoria2 hr

Nearby

Severe Thunderstorm Warnings in Texas, 1987Every severe thunderstorm warning in 1987

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.