Alert archive / Texas / Flash Flood Warnings in 1986

Flash Flood Warning 72, NWS Austin/San Antonio, TX

December 22, 1986Bexar County, Comal County, Guadalupe County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Dec 22, 1986, 6:20 PM CST for Bexar County, Comal County, Guadalupe County, Texas. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Dec 22, 1986, 6:20 PM CST (00:20 UTC)
Expired
Dec 22, 1986, 10:15 PM CST
In force
4 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties Bexar County, TX, Comal County, TX, Guadalupe 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, 0.3 hours before the alert went out and 252 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 1986-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1986-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -55 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
740 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-55 m²/s²
0-3 km storm-relative helicity
-29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 230020
FFWSAT
TXC029-091-187-230415-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANTONIO TX
620 PM CST MON DEC 22 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 1015 PM CST FOR PEOPLE IN THE FOLLOWING COUNTIES OF

SOUTH CENTRAL TEXAS...BEXAR...COMAL AND GUADALUPE

WIDESPREAD RAINFALL OVER BEXAR...COMAL AND GUADALUPE COUNTIES THIS
AFTERNOON AVERAGED NEAR 3 INCHES WITH ISOLATED TOTALS TO NEAR 6
INCHES.  MOST LOW WATER CROSSINGS OVER THESE THREE COUNTIES ARE NOW
UNDER WATER...WITH FLOODING EXPECTED TO BECOME WORSE IN THE NEXT 2
HOURS AS ADDITIONAL WATER FROM RAINFALL UPSTREAM ADDS TO THE
FLOODING.  MANY LOW AREAS AND POORLY DRAINED AREAS WILL REMAIN
UNDER WATER THROUGH THE NEXT SEVERAL HOURS AS WELL.

A FLASH FLOOD WARNING MEANS FLOODING IS IMMINENT OR HAS BEEN
REPORTED.  TAKE NECESSARY PRECAUTIONS AS REQUIRED TO PROTECT LIFE
AND PROPERTY.

REMEMBER..DEATHS DURING FLASH FLOODING ARE FREQUENTLY RELATED TO
MOTORISTS DRIVING INTO FLOODED LOW WATER CROSSINGS.

IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE
IMMEDIATELY.  YOU SHOULD ASK THE NEAREST LAW ENFORCE0MENT AGENCY
TO RELAY YOUR SEVERE WEATHER REPORTS TO THE LOCAL NATIONAL WEATHER
SERVICE OFFICE.

PLEASE LISTEN TO YOUR LOCAL RADIO..TV OR NOAA WEATHER RADIO STATION
FOR LATER STATEMENTS OR WARNINGS REGARDING THIS HEAVY RAIN 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, Dec 22, 1:17 PM CST, 5 hours 3 minutes before
BULLETIN
URBAN AND SMALL STREAM FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
115 PM CST MON DEC 22 1986

WIDESPREAD RAINS CONTINUE ACROSS A LARGE EXPANSE OF THE HILL COUNTRY
AND SOUTH CENTRAL TEXAS AT THIS HOUR.  SATELLITE PHOTOS AND RADAR
OBSERVATIONS SHOW MORE RAIN MOVING FROM THE RIO GRANDE INTO SOUTH
TEXAS.

SOME OF THE RAIN TOTALS DURING THE NIGHT AND MORNING HAVE EXCEEDED 5
INCHES.  ADDITIONAL 1 TO 3 INCH AMOUNTS COULD OCCUR THIS AFTERNOON
AND TONIGHT.

SINCE THE GROUND IS WELL SATURATED...ANY MORE RAIN WILL NOT SOAK IN BUT
BEGIN TO RUN OFF INTO SWOLLEN CREEKS AND RIVERS...AND ADD TO THE THREAT
OF FLOODING.  SOME URBAN FLOODING OF STREETS...LOW-WATER CROSSINGS AND
CREEKS HAVE ALREADY BEEN REPORTED IN AND AROUND SAN ANTONIO AND BEXAR
COUNTY...MORE COULD OCCUR THIS AFTERNOON AND TONIGHT AS RAINS CONTINUE.
<
MOTORISTS SHOULD EXERCISE CAUTION ON WET SLICK STREETS...AND NOT TRY
TO CROSS SWOLLEN LOW-WATER CROSSINGS OR DRIVE AROUND BARRICADES.
FLOOD-PRONE UNDERPASSES IN AND AROUND SAN ANTONIO SHOULD BE APPROACHED
WITH CAUTION.  CAMPERS SHOULD MOVE TO HIGH GROUND AWAY FROM THE FLOOD
PLAINS OF CREEKS AND RIVERS.  PARENTS SHOULD DISCOURAGE CHILDREN FROM
PLAYING IN OR NEAR FLOOD DRAINAGE DITCHES...LOW-WATER CROSSINGS OR
CREEKS SUBJECT TO RAPIDLY RISING WATERS.

THE RAINS ARE EXPECTED TO CONTINUE THROUGH THE LATE AFTERNOON AND EARLY
EVENING RUSH HOUR...AND PROBABLY THROUGH THE EVENING CHRISTMAS SHOPPING
TIMES.

PLEASE STAY TUNED FOR LATER STATEMENTS OR POSSIBLE WARNINGS.  LEON...
CIBOLO...OLMOS AND SALADO CREEKS IN AND AROUND BEXAR COUNTY AND SAN
ANTONIO WILL BE NEAR OR OUT OF BANKS MUCH OF THE AFTERNOON AND INTO
TONIGHT...STAGES AND FORECAtSTS WILL BE ISSUED AS INFORMATION BECOMES
AVAILABLE.
Special weather statement, Dec 22, 5:51 PM CST, 29 minutes before
BULLETIN
URBAN AND SMALL STREAM FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
555 PM CST MON DEC 22 1986

WIDESPREAD RAIN CONTINUED OVER MOST OF SOUTH TEXAS JUST BEFORE 600 PM.
THE RAIN AREA...AS INDICATED BY WEATHER SERVICE RADAR AND SATELLITE
OBSERVATIONS...WAS MOVING SLOWLY EASTWARD.

RAINFALL TOTALS SINCE LAST NIGHT FROM THE HILL COUNTRY SOUTHEASTWARD TO
SOUTH CENTRAL TEXAS HAVE AVERAGED FROM 1 TO 2 INCHES.  RAINFALL FROM
FREDERICKSBURG TO SAN MARCOS...SEGUIN...JOURDANTON AND SAN ANTONIO BACK
TO FREDERICKSBURG AVERAGED FROM 2 TO 3 INCHES WITH ISOLATED TOTALS OF
MORE THAN 4 INCHES.  SO FAR...THE GREATEST RAIN REPORT WAS NEAR 6 INCHES
FROM THE CITY OF LIVE OAK...JUST NORTHEAST OF SAN ANTONIO.

THE WIDESPREAD RAIN HAS SATURATED THE GROUND...CAUSING SOME SHORT LIVED
FLOODING OF URBAN STREETS AND ROADS.  LOW LYING AREAS AND POORLY DRAINED
AREAS WILL CONTINUE TO HAVE PROBLEMS AS WELL...AS RAIN IS EXPECTED TO
CONTINUE FROM THE HILL COUNTRY ACROSS SOUTH CENTRAL TEXAS TONIGHT.

MOTORISTS SHOULD EXERCISE CAUTION ON THE WET AND SLICK STREETS...AVOID
FLOODED LOW-WATER CROSSINGS AND NOT TRY TO DRIVE AROUND BARRICADES.
PARENTS SHOULD MAKE CERTAIN CHILDREN DO NOT PLAY IN OR NEAR FLOODED
STREAMS OR CREEKS.

FLOODING IS ALSO OCCURRING ALONG PORTIONS OF LEON CREEK AND SALADO CREEK
IN SAN ANTONIO.  LEON CREEK NEAR KELLY AIR FORCE BASE IS EXPECTED TO
REMAIN AT 10 TO 12 FEET THROUGH MIDNIGHT...FLOOD STAGE IS 13 FEET.
THE HEAVIEST FLOODING ALONG SALADO CREEK IS EXPECTED TO OCCUR FROM NEAR
LOOP 410 IN NORTHEAST SAN ANTONIO SOUTHWARD ACROSS THE EASTERN PORTION
OF THE CITY TO NEAR LOOP 13.  PERSONS LIVING IN AREAS PRONE TO FLOODING
ALONG THIS PORTION OF SALADO CREEK SHOULD BE PREPARED TO MOVE TO A SAFE
LOCATION.

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 22, 9:43 PM CSTFlash Flood WarningEWXBexar, Comal, Guadalupe4 hr

Nearby

Flash Flood Warnings in Texas, 1986Every flash flood warning in 1986

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.