Alert archive / Texas / Flash Flood Warnings in 1988

Flash Flood Warning 23, NWS Austin/San Antonio, TX

September 17, 1988Val Verde County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Sep 17, 1988, 9:00 PM CDT for Val Verde County, Texas. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Sep 17, 1988, 9:00 PM CDT (02:00 UTC)
Expired
Sep 18, 1988, 1:00 AM CDT
In force
4 hr
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, 2.0 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 1988-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2067 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 1988-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 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
2067 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
572 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
259 m²/s²
Significant tornado parameter
1.4
Supercell composite
10.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDRT 180157
FFWDRT
TXC465-180600-

BULLETIN - EBS ACTIVITATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DEL RIO TX
900 PM CDT SAT SEP 171988

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 100 AM CDT SUNDAY MORNING FOR PEOPLE IN THE FOLLOWING
COUNTY...

IN SOUTHCENTRAL TEXAS...VAL VERDE.

AT 900 PM CDT THUNDERSTORMS WITH HEAVY RAIN COVER MOST OF VAL VERDE
COUNTY EXTENDING MORE THAN 90 MILES SOUTH INTO MEXICO. MODERATE TO HEAVY
RAINS WILL CONTINUE THROUGH THE NIGHT. TWO TO THREE INCHES OF RAIN HAS
FALLEN OVER MOST OF VAL VERDE COUNTY TODAY. ANOTHER THREE INCHES OR MORE
RAIN IS POSSIBLE THROUGH THE NIGHT.

PERSONS LIVING IN LOW FLOOD PRONE AREAS SHOULD MAKE PREPARATIONS TO
MOVE TO HIGHER GROUND IF FLASH FLOODING IS OBSERVED OR REPORTED DURING
THE NIGHT.

SEVERAL LOW LYING AREAS AND LOW WATER CROSSINGS IN DEL RIO ARE FLOODED
NOW. MOTORISTS SHOULD USE EXTREME CAUTION.

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.

A FLASH FLOOD WATCH IS IN EFFECT THROUGH SUNDAY AND A TORNADO WATCH
REMAINS IN EFFECT UNTIL 2 AM CDT SUNDAY MORNING.

PLEASE LISTEN TO YOUR LOCAL RADIO...TV OR NOAA WEATHER RADIO STATION FOR
LATER STATEMENTS OR WARNINGS REGARDING THIS SERIOUS WEATHER EVENT.

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, Sep 17, 4:16 PM CDT, 4 hours 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
415 PM CDT SAT SEP 17 1988

...A TORNADO WATCH IS IN EFFECT FOR SOUTH CENTRAL TEXAS UNTIL 500 PM...
...A TORNADO WATCH IS IN EFFECT FOR THE TEXAS HILL COUNTRY AND ADJACENT
SECTIONS OF SOUTH CENTRAL TEXAS UNTIL 800 PM...
...A FLASH FLOOD WATCH IS IN EFFECT FOR THE WEST AND CENTRAL SECTIONS OF
SOUTH TEXAS THROUGH SUNDAY...

SCATTERED TO NUMEROUS THUNDERSTORMS WERE INDICATED BY WEATHER SERVICE
RADAR AT 410 PM THIS AFTERNOON OVER CENTRAL TEXAS. THE MOST CONCENTRATED
AREA WAS BETWEEN JUNCTION...AUSTIN...SAN ANTONIO...EAGLE PASS AND BACK
TO JUNCTION.  THE STORMS WERE MOVING TO THE NORTHWEST AT 25 MPH.

A THREAT OF ISOLATED TORNADOES CONTINUES THROUGH THIS AFTERNOON FOR MOST
OF CENTRAL TEXAS.  THE SIGHTINGS OF TORNADOES HAVE DECREASED SINCE NOON
TODAY...A VERY UNSTABLE AIRMASS AND DEEP TROPICAL MOISTURE CONTINUE THE
POSSIBILITY FOR A FEW HOURS YET.  THESE THUNDERtSTORMS ARE ALSO QUITE
CAPABLE OF PRODUCING BRIEF BUT VERY HEAVY RAINFALL.  WITH THE SOIL IN
MANY SECTIONS OF THE WATCH AREA ALREADY SATURATED...THERE WILL BE A
THREAT OF FLOODING AS WELL THROUGH TONIGHT.
Special weather statement, Sep 17, 4:49 PM CDT, 4 hours 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
4:45 PM CDT SAT SEPT 17 1988

...FLOOD AND FLASH FLOOD WATCH IN EFFECT INTO SUNDAY FOR GILLSIPIE...
LLANO...LAMPASAS...SAN SABA AND MILLS COUNTY.

...TORNADO WATCHES NUMBER 424 IS IN EFFECT UNTILL 9 PM...WITH NUMBER
423 IN EFFECT UNTILL 8 PM FOR SOUTHWEST..CENTRAL AND NORTH CENTRAL
TEXAS. THESE INCLUDE TRAVIS AND ALL COUNTIES SURROUNDING TRAVIS COUNTY.

AUSTIN RADAR CONTINUES TO INDICATE STRONG THUNDERSTORMS WEST OF BUDA...
NORTH OF GEORGETOWN AND WEST OF HARPER AND LAKE BUCHANAN.

NUMEROUS LIGHT TO MODERATE BANDS OF SHOWERS AND THUNDERSHOWERS WERE
NOTED WITHIN 100 MILES OF AUSTIN MOSTLY TO THE SOUTHWEST THROUGH NORTH OF
AUSTIN MOVING TOWARDS THE NORTHWEST AT 20 TO 25 MPH.

WITH EXTREMELY UNSTABLE AIR ACOSS CENTRAL TEXAS...RESIDENTS SHOULD

 KEEP ALERT TO THE THREAT OF SEVERE STORMS AS WELL AS HEAVY RAINS AND
FLOODING.

MOSTLY LIGHT TO MODERATE SHOWERS WERE NOTED NORTHEAST THROUGH SOUTHEAST
OF AUSTIN AND THESE WERE WIDELY SCATTERED.
Local storm report, Sep 17, 6:02 PM CDT, 2 hours 58 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DEL RIO TX
600 PM CDT SAT SEP 17 1988
540 PM CDT SEP 17...TORNADOES ON GROUND WITH 10 HOMES PLUS DAMAGED. 3
HOMES AND UNKNOWN MOBILE HOMES DESTROYED.  INJURIES KNOWN BUT DO NOT
KNO TO WHAT EXTEND.
Special weather statement, Sep 17, 6:39 PM CDT, 2 hours 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
6:30 PM CDT SAT SEPT 17 1988

...FLOOD AND FLASH FLOOD WATCH IN EFFECT INTO SUNDAY FOR GILLSIPIE...
LLANO...LAMPASAS...SAN SABA AND MILLS COUNTY.

...TORNADO WATCHES...NUMBER 424 IS IN EFFECT UNTILL 9 PM....NUMBER
423 IS IN EFFECT UNTILL 8 PM..FOR SOUTHWEST..CENTRAL AND NORTH CENTRAL
TEXAS. THESE INCLUDE TRAVIS AND ALL SURROUNDING COUNTIES.

AUSTIN RADAR INDICATES STRONG THUNDERSTORMS NORTHWEST OF LAKE BUCHANAN
AND NORTH OF MULLIN. THESE MAY PRODUCE BRIEF HEAVY RAINS AND GUSTY WINDS.

NUMEROUS LIGHT TO MODERATE BANDS OF SHOWERS AND A FEW THUNDERSHOWERS WERE
NOTED WEST THROUGH NORTH OF AUSTIN. MOVEMENT WAS TOWARDS THE NORTHWEST
AT 20 TO 25 MPH.

ONLY WIDELY SCATTERED MOSTLY LIGHT SHOWERS WERE INDICATED NORTH THROUGH
EAST THROUGH SOUTH OF AUSTIN.

WITH EXTREMELY UNSTABLE AIR ACROSS CENTRAL TEXAS...RESIDENTS SHOULD
KEEP ALERT TO THE THREAT OF SEVERE STORMS AS WELL AS HEA5VY RAINS AND
FLOODING.

...NO SEVERE WEATHER OR FLOODING WAS BEEN REPORTED TO THE AUSTIN WEATHER
SERVICE WITHIN THE PAST HOUR....
Special weather statement, Sep 17, 7:55 PM CDT, 1 hour 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
8 PM CDT SAT SEPT 17 1988

...FLOOD AND FLASH FLOOD WATCH IN EFFECT INTO SUNDAY FOR GILLSIPIE...
LLANO...LAMPASAS...SAN SABA AND MILLS COUNTY.

...TORNADO WATCH NUMBER 423 IS NO LONGER IN EFFECT...
...TORNADO WATCH NUMBER 424 IS IN EFFECT UNTILL 9PM FOR THE COUNTIES
   OF LAMPASAS AND MILAM...
...TORNADO WATCH NUMBER 425 IS NOW IN EFFECT UNTILL 2 AM SUNDAY FOR THE
COUNTIES OF MILLS...SAN SABA AND GILLSIPIE...

SHOWER AND THUNDERSTORM ACTIVITY IS DECREASING IN INTENSITY AND AREA
COVERAGE IN ALL DIRECTIONS OF AUSTIN. ONLY LIGHT TO MODERATE SHOWERS WERE
NOTED...WIDELY SCATTERED FROM SOUTH TO WEST TO NORTH OF AUSTIN AND NONE
FROM THE NORTH NORTHEAST THROUGH THE SOUTH SOUTHEAST. MOVEMENT WAS
TOWARDS THE NORTHWEST AT 20 TO 25 MPH.

WITH EXTREMELY UNSTABLE AIR ACROSS CENTRAL TEXAS...RESIDENTS SHOULD
KEEP ALERT TO THE THREAT OF SEVERE STORMS AS WELL AS HEAVY RAINS AND
FLOODING.

...NO SEVERE WEATHER OR FLOODING WAS BEEN REPORTED TO THE AUSTIN WEATHER
SERVICE WITHIN THE PAST HOUR....
Special weather statement, Sep 17, 8:58 PM CDT, 2 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
9 PM CDT SAT SEPT 17 1988

...FLOOD AND FLASH FLOOD WATCH IN EFFECT INTO SUNDAY FOR GILLSIPIE...
LLANO...LAMPASAS...SAN SABA AND MILLS COUNTY.

...TORNADO WATCH NUMBER 424 IS NO LONGER IN EFFECT...
...TORNADO WATCH NUMBER 425 IS NOW IN EFFECT UNTILL 2 AM SUNDAY FOR THE
COUNTIES OF MILLS...SAN SABA AND GILLSIPIE...

AUSTIN RADAR INDICATES ONLY WIDELY SCATTERED LIGHT TO MODERATE SHOWERS
FROM NEAR LOCKHART AND LULING TO SAN ANTIONIO AND BOERNE TO HARPER AND
LAMPASAS AND BRADY. MOVEMENT WAS TOWARDS THE NORTHWEST AT NEAR 20 MPH.
WITH EXTREMELY UNSTABLE AIR ACROSS CENTRAL TEXAS...RESIDENTS SHOULD
KEEP ALERT TO THE THREAT OF SEVERE STORMS AS WELL AS HEAVY RAINS AND
FLOODING.

...NO SEVERE WEATHER OR FLOODING WAS BEEN REPORTED TO THE AUSTIN WEATHER
SERVICE WITHIN THE PAST HOUR....

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 17, 7:25 PM CDTTornado WarningEWXVal Verde75 min
Sep 18, 9:30 AM CDTFlash Flood WarningEWXVal Verde4 hr

Nearby

Flash Flood Warnings in Texas, 1988Every flash flood warning in 1988

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.