Alert archive / Texas / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 76, NWS Austin/San Antonio, TX

May 18, 1987Val Verde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 18, 1987, 7:35 PM CDT for Val Verde County, Texas. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
May 18, 1987, 7:35 PM CDT (00:35 UTC)
Expired
May 18, 1987, 8:35 PM CDT
In force
60 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Val Verde 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, 0.6 hours before the alert went out and 66 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 1987-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3088 joules per kilogram.LCLEL10008507005003002001001 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 1987-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 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
3088 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
821 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.9

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 18, 3:16 PM CDT, 4 hours 19 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DEL RIO TX
316 PM CDT MON MAY 18 1987

AT 305 PM CDT RADAR INDICATED THUNDERSTORMS AND RAINSHOWERS FROM
35 MILES SOUTHWEST OF DEL RIO IN OLD MEXICO TO 20 MILES NORTHWEST AND
EXTENDED NORTHEAST TO SOUTH OF SONORA. THE STRONGEST STORM WAS
ALONG THE RIO GRANDE RIVER 20 MILES NORTHWEST OF DEL RIO. THESE
STORMS WERE MOVING TO THE NORTH AT 15 MPH.

HEAVY RAIN...SMALL HAIL...FREQUENT DANGEROUS LIGHTNING qAND STRONG
GUSTY WINDS ARE POSSIBLE WITH THESE STORMS.

BOATERS ON LAKE AMISTAD AND THE RIO GRANDE RIVER SHOULD BE AWARE THAT
NOT ONLY STRONG GUSTY WINDS BUT ALSO LIGHTNING POSES A THREAT TO
SAFETY.
Special weather statement, May 18, 3:44 PM CDT, 3 hours 51 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
340 PM CDT MON MAY 18 1987

NATIONAL WEATHER SERVICE RADAR AT HONDO, TEXAS WAS INDICATING SHOWERS
AND THUNDERSTORMS DEVELOPING FROM SOUTHWEST TO WEST OF DEL RIO...ACROSS
VAL VERDE COUNTY...NORTHWEST EDWARDS COUNTY...NORTHWEST OF ROCKSPRINGS
INTO THE HILL COUNTRY...WEST AND NORTHWEST OF JUNCTION.

OTHER ISOLATED SHOWERS WERE BEGINNING TO DEVELOP OVER OTHER SECTIONS OF
SOUTH CENTRAL TEXAS.

THE SHOWERS AND THUNDERSTORMS WERE MOVING TO THE NORTH AT 15 MPH.
Special weather statement, May 18, 5:08 PM CDT, 2 hours 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
510 PM CDT MON MAY 18 1987

AT 505 PM AUSTIN WEATHER RADAR INDICATED THUNDERSTORMS OVER MILLS
AND SAN SABA COUNTIES.  THESE THUNDERSTORMS ARE MOVING VERY SLOWLY
TO THE NORTHEAST.  RAINFALL RATES FROM THESE STORMS ARE INTENSE..
1 TO 2 INCHES PER HOUR.

WITH THE SLOW MOVEMENT OF THESE THUNDERSTORMS..LOCALLY HEAVY RAIN..
SMALL HAIL AND DANGEROUS LIGHTNING IS OCCURRING.  SOME FLOODING MAY
BE OCCURRING ON ROADWAYS AND SMALL STREAMS.
Special weather statement, May 18, 5:12 PM CDT, 2 hours 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DEL RIO TX
512 PM CDT MON MAY 18 1987

AT 500 PM CDT VERY STRONG THUNDERSTORMS REMAIN IN THE COMSTOCK AREA
AND EXTENDED NORTHEAST TO SONORA. OTHER THUNDERSTORMS AND RAINSHOWERS
WERE DEVELOPING 10 MILES SOUTHEAST TO 10 MILES SOUTH OF DEL RIO.
THE STRONGEST STORM REMAINED NEAR COMSTOCK. THESE STORMS WERE MOVING
TO THE NORTH AT 15 MPH.

HEAVY RAIN HAS BEEN REPORTED AT COMSTOCK. SINCE THESE STORMS
CONTINUE TO DEVELOP IN THE SAME AREA AROUND COMSTOCK FLOODING OF
LOW WATER CROSSINGS AND SMALL STREAMS IS LIKELY.

HEAVY RAIN...SMALL HAIL...FREQUENT DANGEROUS LIGHTNING AND STRONG
GUSTY WINDS ARE POSSIBLE WITH THESE STORMS.

BOATERS ON LAKE AMISTAD AND THE SURROUNDING RIVERS SHOULD
CONTINE TO REMAIN ALERT AND PLAN TO SEEK SAFE HARBOR IF
CONDITIONS WORSEN.
Special weather statement, May 18, 6:24 PM CDT, 1 hour 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DEL RIO TX
625 PM CDT MON MAY 18 1987

...INTENSE THUNDERSTORMS OBSERVED IN THE DEL RIO AREA...

AT 620 PM CDT INTENSE THUNDERSTORMS WITH RAINSHOWERS...>GUSTY WINDS
AND FREQUENT DANGEROUS LIGHTNING WERE OBSERVED AT THE DEL RIO
INTERNATIONAL AIRPORT.

FLOODING OF LOW WATER CROSSINGS AND LOW LYING AREAS IN DEL RIO IS
LIKELY AS THESE STORMS PASS THROUGH THE AREA.
Special weather statement, May 18, 6:55 PM CDT, 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
655 PM CDT MON MAY 18 1987

...STRONG THUNDERSTORM NEAR EAGLE PASS TEXAS...

A STRONG THUNDERSTORM HAS MOVED OUT OF MEXICO AND IS LOCATED NEAR
EAGLE PASS TEXAS.  THIS THUNDERSTORM CONTAINS VERY HEAVY RAIN...SMALL
HAIL AND GUSTY WINDS.  THE THUNDERSTORM IS MOVING NORTH ABOUT 15 MPH
AND SHOULD BE OUT OF THE CITY IN ABOUT ONE HALF HOUR.

OTHER THUNDERSTORMS CONTINUE TO FOhRM OVER MEXICO AND ARE MOVING EAST
TOWARDS TEXAS.

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 7:19 PM CDTSevere Thunderstorm WarningEWXMaverick56 min
May 18, 9:13 PM CDTSevere Thunderstorm WarningEWXReal62 min
May 19, 10:58 AM CDTFlash Flood WarningEWXKendall2 hr
May 19, 3:15 PM CDTSevere Thunderstorm WarningEWXBexar60 min
May 19, 4:14 PM CDTSevere Thunderstorm WarningEWXBexar61 min
May 19, 4:23 PM CDTSevere Thunderstorm WarningEWXHays, Travis67 min
May 19, 5:03 PM CDTTornado WarningEWXGuadalupe57 min
May 19, 6:06 PM CDTSevere Thunderstorm WarningEWXBexar, Wilson54 min
May 19, 6:29 PM CDTSevere Thunderstorm WarningEWXTravis61 min
May 19, 6:39 PM CDTTornado WarningEWXWilson66 min
May 19, 6:59 PM CDTSevere Thunderstorm WarningEWXBexar61 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.