Alert archive / Texas / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 52, NWS Austin/San Antonio, TX

May 13, 1987Zavala County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 13, 1987, 7:26 PM CDT for Zavala County, Texas. It was in force for 64 min.

The area

The counties it named.

The facts

Issued
May 13, 1987, 7:26 PM CDT (00:26 UTC)
Expired
May 13, 1987, 8:30 PM CDT
In force
64 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Zavala 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

Del Rio, TX (KDRT), launched 00:00Z, 0.4 hours before the alert went out and 119 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 1987-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3087 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, Del Rio, TX at 00:00Z on 1987-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 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
3087 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1367 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
65 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 140026 RRA
SVRSAT
TXC507-140130-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN ANTONIO TX
726 PM CDT WED MAY 13 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  830 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH TEXAS
          ...ZAVALA
 
WEATHER SERVICE RADAR INDICATES A POSSIBLE SEVERE THUNDERSTORM 10
MILES WEST OF CRYSTAL CITY IN SOUTHWEST ZAVALA COUNTY.  THE STORM
LIKELY CONTAINS LARGE HAIL...DAMAGING WIND AND VERY HEAVY RAIN.
IT IS MOVING TO THE NORTH AT 5 TO 10 MILES AN HOUR.
 
WHEN A THUNDERSTORM THREATENS...SEEK SHELTER INSIDE A HOME OR
BUILDING AWAY FROM DOORS AND WINDOWS.  REFRAIN FROM USING ELECTRICAL
APPLIANCES.

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.

In the hours before

Special weather statement, May 13, 1:28 PM CDT, 5 hours 58 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
125 PM CDT WED MAY 13 1987

...STRONG THUNDERSTORMS 50 MILES SOUTHEAST OF AUSTIN...

A NARROW BAND OF STRONG THUNDERSTORMS IS MOVING ACROSS THE COLORADO
RIVER BETWEEN GRANGER AND COLUMBUS. THESE THUNDERSTORMS MAY PRODUCE
BRIEF HEAVY RAINS...GUSTY WINDS AND SOME SMALL HAIL WITHIN THE NEXT
HOUR AS THEY MOVE EASTWARD AT NEAR 25 MPH.

OTHER LIGHT SHOWERS CONTINUE TO MOVE EASTWARD...SOUTH OFT A LINE FROM
NEAR SAN MARCOS TO ROSANKY.

The office that day

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

IssuedProductOfficeCountiesLasted
May 13, 8:09 PM CDTSevere Thunderstorm WarningEWXBexar66 min
May 13, 9:28 PM CDTSevere Thunderstorm WarningEWXUvalde62 min
May 13, 10:20 PM CDTSevere Thunderstorm WarningEWXBandera, Kerr55 min

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.