Alert archive / Texas / Flash Flood Warnings in 1987

Flash Flood Warning 96, NWS Austin/San Antonio, TX

November 8, 1987Williamson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Nov 8, 1987, 1:04 PM CST for Williamson County, Texas. It was in force for 116 min.

The area

The counties it named.

The facts

Issued
Nov 8, 1987, 1:04 PM CST (19:04 UTC)
Expired
Nov 8, 1987, 3:00 PM CST
In force
116 min
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Williamson 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

Stephenville/Cla, TX (KSEP), launched 12:00Z, 7.1 hours before the alert went out and 181 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, Stephenville/Cla, TX at 12:00Z on 1987-11-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1405 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, Stephenville/Cla, TX at 12:00Z on 1987-11-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 171 square meters per square second.19395878Sfc1 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
1405 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
575 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
171 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.9
Supercell composite
4.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KAUS 081904
FFWAUS
TXC209-453-491-082100-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN TX
104 PM CST SUN NOV 8 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL  300 PM CST FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTH CENTRAL TEXAS
          ...NORTHWESTERN HAYS...WESTERN TRAVIS...WESTERN WILLIAMSON
 
A LINE OF THUNDERSTORMS IS MOVING OVER THIS AREA AND SOME LOCAL AREAS
NEAR LAKE TRAVIS HAVE RECEIVED MORE THAN 3 INCHES OF RAIN ALREADY.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

What forecasters said that day

The local office's own words before this flash flood 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, Nov 8, 7:46 AM CST, 5 hours 18 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DEL RIO TX
746 AM CST SUN NOV 8 1987

...STRONG THUNDERSTORMS WITH FREQUENT LIGHTNING MOVING INTO SOUTHERN
VAL VERDE COUNTY TEXAS AND LAKE AMISTAD AREA...

AT 740 AM CST RADAR INDICATED AN INTENSE THUNDERSTORM ALONG THE RIO
GRANDE RIVER...18 MILES NORTHWEST OF DEL RIO AND SOUTH SOUTHWEST OF
COMSTOCK...AND ANOTHER INTENSE STORM ABOUT 10 MILES SOUTH OF LOMA ALTA.
THESE THUNDERSTORMS WERE PART OF A LARGE AREA OF SHOWERS AND
THUNDERSTORMS COVERING SOUTHWEST TEXAS FROM NEAR JUNO...IN NORTHERN VAL
VERDE COUNTY EXTENDING TO 80 MILES SOUTHWEST OF DEL RIO AND SOUTH ALONG
THE RIO GRANDE TO NEAR LAREDO. THE THUNDERSTORMS WERE MOVING NORTHEAST
AT NEAR 15 MPH.

SMALL HAIL...GUSTY WINDS TO 45 MPH...HEAVY RAIN...AND FREQUENT LIGHTNING

WILL BE POSSIBLE FROM THESE STORMS AS THEY PASS THROUGH THE AREA.
BOATERS ON LAKE AMISTAD SHOULD MONITOR THE SITUATION CLOSELY AND BE
PREPARED TO SEEK SAFE HARBOR IF THREATENING WEATHER APPROACHES.
REMEMBER THAT LIGHTNING CAN STRIKE FAR AWAY FROM THE PARENT
THUNDERSTORM.
Special weather statement, Nov 8, 8:44 AM CST, 4 hours 20 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DEL RIO TX
845 AM CST SUN NOV 8 1987

...STRONG THUNDERSTORMS WITH FREQUENT LIGHTNING AND HEAVY RAINS
CONTINUE ACROSS MOST OF THE EASTERN HALF OF VAL VERDE COUNTY TEXAS...

AT 830 AM CST RADAR INDICATED THUNDERSTORMS  FROM WEST OF
HIGHWAY 163 AT THE NORTHERN VAL VERDE CROCKETT COUNTY LINE  EXTENDING
EAST TO ROCKSPRINGS THEN SOUTH TO LAREDO. INTENSE THUNDERSTORMS REMAINED
NORTHWEST AND SOUTH OF LOMA ALTA IN THE EASTERN PART OF VAL VERDE
COUNTY. VERY HEAVY RAINS HAS BEEN OBSERVED IN THAT AREA BUT NO ACTUAL
AMOUNTS HAVE BEEN REPORTED AS OF YET. COMSTOCK REPORTED .75 INCH OF RAIN
IN JUST OVER ONE HOUR AND IT WAS STILL RAINING.

THE THUNDERSTORMS WERE MOVING NORTHEAST AT AROUND 15 MPH.

BECAUSE OF THE AREAL COVERAGE AND THE INTENSITY OF THE THUNDERSTORMS IN
LOMA ALTA AREA SOME OF THE RANCH ROADS CROSSING DRAWS MAY BEGIN TO
EXPERIENCE SOME FLOODING.

SMALL HAIL...GUSTY WINDS TO 45 MPH...HEAVY RAIN...AND FREQUENT LIGHTNING
WILL BE POSSIBLE FROM THESE STORMS AS THEY PASS THROUGH THE AREA.
BOATERS ON LAKE AMISTAD AND CAMPERS IN THE DOLAN CREEK AREA SHOULD
MONITOR THE SITUATION CLOSELY AND BE PREPARED TO SEEK SAFE HARBOR IF
THREATENITNG WEATHER APPROACHES. REMEMBER THAT LIGHTNING CAN STRIKE FAR
AWAY FROM THE PARENT THUNDERSTORM.
Special weather statement, Nov 8, 9:01 AM CST, 4 hours 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DEL RIO TX
902 AM CST SUN NOV 8 1987

...STRONG THUNDERSTORMS WITH FREQUENT LIGHTNING AND HEAVY RAINS
CONTINUE ACROSS MOST OF THE EASTERN HALF OF VAL VERDE COUNTY TEXAS...

AT 850 AM CST RADAR INDICATED THUNDERSTORMS  FROM WEST OF HIGHWAY 163 AT
THE NORTHERN VAL VERDE CROCKETT COUNTY LINE  EXTENDING EAST TO
ROCKSPRINGS THEN SOUTH TO LAREDO. A LINE OF INTENSE THUNDERSTORMS
WAS LOCATED FROM 10 MILES NORTH OF DEL RIO EXTENDING TO THE NORTH ALL
THE WAY TO THE SUTTON COUNTY LINE. AS THESE HAVE BEEN REPORTED TO BE
PRODUCING VERY HEAVY RAINS ANY MOTORIST TRAVELING NORTH OUT DEL RIO ON
HIGHWAY 277 SHOULD EXERCISE EXTREME CAUTION AND BE PREPARED TO STOP
SUDDENLY FOR HEAVY RAINS AND POOR VISIBILITY. VERY HEAVY RAINS HAS BEEN
OBSERVED IN THAT AREA BUT NO ACTUAL AMOUNTS HAVE BEEN REPORTED AS OF
YET. COMSTOCK REPORTED .75 INCH OF RAIN IN JUST OVER ONE HOUR AND IT WAS
STILL RAINING.

THE THUNDERSTORMS WERE MOVING NORTHEAST AT AROUND 15 MPH.

BECAUSE OF THE AREAL COVERAGE AND THE INTENSITY OF THE THUNDERSTORMS IN
LOMA ALTA AREA SOME OF THE RANCH ROADS CROSSING DRAWS MAY BEGIN TO
EXPERIENCE SOME FLOODING.

SMALL HAIL...GUSTY WINDS TO 45 MPH...HEAVY RAIN...AND FREQUENT LIGHTNING
WILL BE POSSIBLE FROM THESE STORMS AS THEY PASS THROUGH THE AREA.
BOATERS ON LAKE AMISTAD AND CAMPERS IN THE DOLAN CREEK AREA SHOULD
MONITOR THE SITUATION CLOSELY AND BE PREPARED TO SEEK SAFE HARBOR IF
THREATENvING WEATHER APPROACHES. REMEMBER THAT LIGHTNING CAN STRIKE FAR
AWAY FROM THE PARENT THUNDERSTORM.
Special weather statement, Nov 8, 11:03 AM CST, 2 hours 1 minute before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DEL RIO TX
1103 AM CST SUN NOV 8 1987

AT 1055 AM CST RADAR INDICATED THE STRONG THUNDERSTORMS HAD MOVED EAST
INTO KINNEY AND EDWARDS COUNTIES. LIGHT RAINSHOWERS REMAIN IN EASTERN
VAL VERDE COUNTY EXCEPT FOR A SMALL AREA OF MODERATE SHOWERS NEAR DEL
RIO. MOVEMENT OF THE SHOWERS WAS TO THE NORTHEAST AT 15 MPH.

THE NATIONAL WEATHER SERVICE OFFICE IN DEL RIO RECEIVED .15 OF AN INCH
OF RAIN WHILE NEARLY ONE INCH OF RAIN FELL AT LOMA ALTA IN THE NORTHEAST
PART OF VAL VERDE COUNTY.

MORE RAIN AND THUNDERSTORMS REMAIN IN THE FORECAST FOR THIS AFTERNOON
AND BOATERS ON LAKE AMISTAD AND CAMPERS ALONG THE LAKE AND RIVERS IN
VAL VERDE COUNTY SHOULD REM	AIN ALERT FOR POSSIBLE THREATENING WEATHER.
Special weather statement, Nov 8, 11:28 AM CST, 1 hour 36 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
1120 AM CDT SUN NOV 8 1987

...THUNDERSTORMS MOVING THROUGH BEXAR COUNTY AND SAN ANTONIO
METROPOLITAN AREA.

THUNDERSTORMS HAVE MOVED INTO THE SAN ANTONIO METROPOLITAN AREA IN THE
PAST HOUR.  SOME OF THESE STORMS MAY CONTAIN DANGEROUS LIGHTNING AND
BRIEF HEAVY RAINFALL.  THESE THUNDERSTORMS ARE PART OF A LARGER AREA
OF THUNDERSTORMS THAT EXTEND FROM NEAR GARNER PARK...EAGLE PASS...
DEL RIO...AND AUSTIN.  THE STORMS ARE MOVING NORTHEAST AT ABOUT 15 MPH.
THESE STORMS ARE IN ADVANCE OF A COLD FRONT THAT SHOULD MOVE THROUGH
THE SAN ANTONIO METROPOLITAN AREA LATER THIS AFTERNOON.

BOATERS ON AREA LAKES SHOULD MONITOR THE SITUATIO'N CLOSELY AND BE
PREPARED TO SEEK SAFE HARBOR IF THREATENING WEATHER APPROACHES.
REMEMBER...LIGHTNING CAN STRIKE FAR AWAY FROM THE PARENT THUNDERSTORM.

ADDITIONAL STATEMENTS WILL BE ISSUED AS REQUIRED ON THIS STORM SYSTEM.

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 8, 1:04 PM CSTFlash Flood WarningEWXHays, Travis116 min

Nearby

Flash Flood Warnings in Texas, 1987Every flash flood 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.