Alert archive / Texas / Flash Flood Warnings in 1986

Flash Flood Warning 41, NWS Austin/San Antonio, TX

June 18, 1986Bandera County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jun 18, 1986, 6:45 AM CDT for Bandera County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jun 18, 1986, 6:45 AM CDT (11:45 UTC)
Expired
Jun 18, 1986, 10:00 AM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Bandera 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, 11.8 hours before the alert went out and 160 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 1986-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 663 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 1986-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
663 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1713 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
215 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 181145
FFWSAT
TXC019-181500-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANTONIO TX
645 AM CDT WED JUN 18 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 1000 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

SOUTH CENTRAL TEXAS...BANDERA

THE BANDERA COUNTY SHERIFFS DEPARTMENT REPORTS NEARLY 4 INCHES OF
RAIN HAVE FALLEN SINCE MIDNIGHT AT BANDERA.  WEATHER SERVICE RADAR
INDICATES HEAVY RAINFALL HAS OCCURRED EAST OF MEDINA IN BANDERA
COUNTY.

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 ENFORCEMENT 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, Jun 18, 3:00 AM CDT, 3 hours 45 minutes before
KSAT 171912

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
300 AM CDT WED JUN 18 1986

...SLOW MOVING THUNDERSHOWERS HAVE DEVELOPED OVER BEXAR COUNTY...

A 300 AM THIS MORNING THUNDERSHOWERS HAVE DEVELOPED OVER BEXAR COUNTY
AND WERE MOVING SLOWLY NORTHWEST AT ABOUT 5 MPH.  THE THUNDERSHOWERS
WERE MOSTLY OVER THE WESTERN HALF OF BEXAR COUNTY WITH THE HEAVIEST
LOCATED OVER THE NORTH PART OF THE COUNTY.  BECAUSE OF THE SLOW MOVEMENT
OF THESE THUNDERSHOWERS..RAINFALL AMOUNTS COULD BE HEAVY.  THEREFORE
LOW WATER CROSSINGS AND SMALL CREEKS COULD FLOOD RAPIDLY.

MOTORISTS SHOULD EXERCISE EXTREME CAUTION AND NOT TRY TO CROSS
FLOODED ROADS.  ADDITIONAL STATEMENTS WILL BE ISSUED AS NECESSARY.
Special weather statement, Jun 18, 6:25 AM CDT, 20 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
620 AM CDT WED JUN 18 1986

..A LARGE AREA OF HEAVY RAINFALL IS LOCATED SOUTH OF GILLESPIE..BLANCO
    AND HAYS COUNTY MOVING SLOWLY NORTHWARD..

THIS LARGE AREA OF RAIN HAS ALREADY PRODUCED TWO TO FOUR INCHES OF
RAINFALL OVER PORTIONS OF BEXAR COUNTY THROUGH THE NIGHT..CAUSING A
FLASH FLOOD WARNING TO BE ISSUED FOR BEXAR COUNTY UNTILL MID MORNING.

AS THIS AREA SPREADS NORTHWARD..PERSONS IN GILLESPIE..BLANCO AND HAYS
COUNTY SHOULD BE ON THE ALERT FOR HEAVY RAINFALL THIS MORNING..THAT MAY
PRODUCE FLASH FLOODING IN LOW LYING AREAS AND LOW WATER CROSSINGS.

ADDITIONAL STATEMENTS WILL BE ISSUED IF NEEDED THIS MORNING.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 4:26 AM CDTFlash Flood WarningEWXBexar5 hr
Jun 18, 8:56 AM CDTFlash Flood WarningEWXBexar3 hr
Jun 18, 9:55 AM CDTFlash Flood WarningEWXBandera3 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.